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Here’s what quantum supremacy does—and doesn’t—mean for computing
And no, superpowerful computers are not about to take over
Google has reportedly demonstrated for the first time that a quantum computer is capable of performing a task beyond the reach of even the most powerful conventional supercomputer in any practical time frame—a milestone known in the world of computing as “quantum supremacy.” (Update: It confirmed the news on October 23.)
The ominoussounding term, which was coined by theoretical physicist John Preskill in 2020, evokes an image of Darth Vader–like machines lording it over other computers. And the news has already produced some outlandish headlines, such as one on the Infowars website that screamed, “Google’s ‘Quantum Supremacy’ to Render All Cryptography and Military Secrets Breakable.” Political figures have been caught up in the hysteria, too: Andrew Yang, a presidential candidate, tweeted that “Google achieving quantum computing is a huge deal. It means, among many other things, that no code is uncrackable.”
Nonsense. It doesn’t mean that at all. Google’s achievement is significant, but quantum computers haven’t suddenly turned into computing colossi that will leave conventional machines trailing in the dust. Nor will they be laying waste to conventional cryptography in the near future—though in the longer term, they could pose a threat we need to start preparing for now.
Here’s a guide to what Google appears to have achieved—and an antidote to the hype surrounding quantum supremacy.
What do we know about Google’s experiment?
We still haven’t had confirmation from Google about what it’s done. The information about the experiment comes from a paper titled “Quantum Supremacy Using a Programmable Superconducting Processor,” which was briefly posted on a NASA website before being taken down. Its existence was revealed in a report in the Financial Times—and a copy of the paper can be found here.
The experiment is a pretty arcane one, but it required a great deal of computational effort. Google’s team used a quantum processor codenamed Sycamore to prove that the figures pumped out by a random number generator were indeed truly random. They then worked out how long it would take Summit, the world’s most powerful supercomputer, to do the same task. The difference was stunning: while the quantum machine polished it off in 200 seconds, the researchers estimated that the classical computer would need 10,000 years.

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When the paper is formally published, other researchers may start poking holes in the methodology, but for now it appears that Google has scored a computing first by showing that a quantum machine can indeed outstrip even the most powerful of today’s supercomputers. “There’s less doubt now that quantum computers can be the future of highperformance computing,” says Nick Farina, the CEO of quantum hardware startup EeroQ.
Why are quantum computers so much faster than classical ones?
In a classical computer, bits that carry information represent either a 1 or a 0; but quantum bits, or qubits—which take the form of subatomic particles such as photons and electrons—can be in a kind of combination of 1 and 0 at the same time, a state known as “superposition.” Unlike bits, qubits can also influence one another through a phenomenon known as “entanglement,” which baffled even Einstein, who called it “spooky action at a distance.”
Thanks to these properties, which are described in more detail in our quantum computing explainer, adding just a few extra qubits to a system increases its processing power exponentially. Crucially, quantum machines can crunch through large amounts of data in parallel, which helps them outpace classical machines that process data sequentially. That’s the theory. In practice, researchers have been laboring for years to prove conclusively that a quantum computer can do something even the most capable conventional one can’t. Google’s effort has been led by John Martinis, who has done pioneering work in the use of superconducting circuits to generate qubits.
Doesn’t this speedup mean quantum machines can overtake other computers now?
No. Google picked a very narrow task. Quantum computers still have a long way to go before they can best classical ones at most things—and they may never get there. But researchers I’ve spoken to since the paper appeared online say Google’s experiment is still significant because for a long time there have been doubts that quantum machines would ever be able to outstrip classical computers at anything.
Until now, research groups have been able to reproduce the results of quantum machines with around 40 qubits on classical systems. Google’s Sycamore processor, which harnessed 53 qubits for the experiment, suggests that such emulation has reached its limits. “We’re entering an era where exploring what a quantum computer can do will now require a physical quantum computer … You won’t be able to credibly reproduce results anymore on a conventional emulator,” explains Simon Benjamin, a quantum researcher at the University of Oxford.
Isn’t Andrew Yang right that our cryptographic defenses can now be blown apart?
Again, no. That’s a wild exaggeration. The Google paper makes clear that while its team has been able to show quantum supremacy in a narrow sampling task, we’re still a long way from developing a quantum computer capable of implementing Shor’s algorithm, which was developed in the 1990s to help quantum machines factor massive numbers. Today’s most popular encryption methods can be broken only by factoring such numbers—a task that would take conventional machines many thousands of years.
But this quantum gap shouldn’t be cause for complacency, because things like financial and health records that are going to be kept for decades could eventually become vulnerable to hackers with a machine capable of running a codebusting algorithm like Shor’s. Researchers are already hard at work on novel encryption methods that will be able to withstand such attacks (see our explainer on postquantum cryptography for more details).
Why aren’t quantum computers as supreme as “quantum supremacy” makes them sound?
The main reason is that they still make far more errors than classical ones. Qubits’ delicate quantum state lasts for mere fractions of a second and can easily be disrupted by even the slightest vibration or tiny change in temperature—phenomena known as “noise” in quantumspeak. This causes mistakes to creep into calculations. Qubits also have a Tinderlike tendency to want to couple with plenty of others. Such “crosstalk” between them can also produce errors.
Google’s paper suggests it has found a novel way to cut down on crosstalk, which could help pave the way for more reliable machines. But today’s quantum computers still resemble early supercomputers in the amount of hardware and complexity needed to make them work, and they can tackle only very esoteric tasks. We’re not yet even at a stage equivalent to the ENIAC, IBM’s first generalpurpose computer, which was put to work in 1945.
So what’s the next quantum milestone to aim for?
Besting conventional computers at solving a realworld problem—a feat that some researchers refer to as “quantum advantage.” The hope is that quantum computers’ immense processing power will help uncover new pharmaceuticals and materials, enhance artificialintelligence applications, and lead to advances in other fields such as financial services, where they could be applied to things like risk management.
If researchers can’t demonstrate a quantum advantage in at least one of these kinds of applications soon, the bubble of inflated expectations that’s blowing up around quantum computing could quickly burst.
When I asked Google’s Martinis about this in an interview for a story last year, he was clearly aware of the risk. “As soon as we get to quantum supremacy,” he told me, “we’re going to want to show that a quantum machine can do something really useful.” Now it’s time for his team and other researchers to step up to that pressing challenge.
Quantum Computing and Finance
Finance can be defined as the science of money management, a discipline almost as old as civilization itself. In a recent paper (http://arxiv.org/abs/1807.03890), the authors of this Medium article have analyzed the intriguing idea of applying quantum mechanics — and specifically quantum computing — to solve key financial problems. This analysis includes the current landscape and a list of possible quantum computing use cases in Finance. We are going to summarize the main ideas displayed there in this article.
In its deeper nature, Finance deals with uncertainty. Concepts such as interest rates and dividends arise from the impossibility of predicting the profits resulting from an investment. Imagine giving a loan to a customer: we don’t know for sure if this customer is going to repay us, or if he is going to pocket the money and disappear.
Financial practitioners (investors, bankers, etc) have traditionally two ways to cope with these situations. They can either charge a fee for the risk of granting the loan — the higher the risk, the higher the interest rate — or cope with the risk statistically, by diversifying their loans, and trying to compensate their losses by relatively large gains.
But our financial practitioner is not alone in the market: he is always competing with others. He must continuously balance the risk of losses from bad investments with the risk of going out of business by not getting enough profits from good investments. This is a tough situation, where failure can have a severe economic impact on society, as we painfully learned from the former financial crisis.
Traditionally, financial players have relayed on the power of computing to reduce the risk. This has led to a computing arms race among them, where bigger profits result from analyzing a situation faster and in more detail. This environment is ripe for quantum computers. Due to their promise of unimaginable computational power, they can impose themselves as the information processing machines that will shape the future of finance. In the following, we discuss some early attempts to tackle financial problems through quantum computing.
Optimization problems are at the core of many financial problems. In portfolio optimization, for instance, the problem consists in selecting the best assets to invest in to balance the risk with the expected returns. This is an NPHard problem, meaning it is extremely difficult — if not impossible — for classical computers to solve efficiently. Quantum annealing, on the other hand, naturally provides methods to identify better solutions for this type of problems.
In an annealing process, we encode the problem we want to solve into an equivalent physical problem. Specifically, we formulate the physical problem such that its lowest energy state is mathematically equivalent to the solution of the problem we want to solve. We then construct this system in the annealer and allow the system to naturally evolve towards its lowest energy state. Classically, the annealer converges to its lower energy state through cooling. In quantum annealing, we use quantum tunneling events to drive the system to its global minimum in a faster and more reliable fashion.
Some promising methods have already been developed for applying quantum annealing to finance:
Optimal trading trajectory: the execution of large trading orders influences the price of the underlying asset, resulting in additional execution costs for the investor who is executing the trade. To avoid this, and to minimize the cost of trading, algorithms are used to control the trading rate of a large order, performing a balance between trading fast to minimize exposure to market risk and trading slow to minimize market impact. The discrete multiperiod version of this problem has been solved on a commercially available quantum annealer provided by DWave. The prospect is that future versions of the DWave machine should soon be able to handle much bigger instances of the problem, eventually overtaking classical methods.
Optimal arbitrage opportunities: the concept of arbitrage is the idea of making profit from differing prices of the same asset in different markets, while bearing no risk. For instance, we could change euros for dollars, dollars to yens, and yens back to euros, and make a small profit in the process. This is crosscurrency arbitrage. While the problem of determining the optimal arbitrage opportunity is NPHard, these can be detected efficiently using quantum annealers. Specifically, solving this problem is equivalent to finding the trajectory with the lowest cost in a directed graph. This was solved for small sample sizes on the DWave 2X quantum annealer, producing the same optimal solutions as an exhaustive classical solver.
Optimal feature selection in credit scoring: before granting a loan, banks consider the borrower’s income, age, financial history, collateral etc., to identify them as a high risk or low risk customer. The core problem is to determine which customer characteristics are the most relevant towards risk assessment. This is crucial when some of the data might be irrelevant or weakly correlated to the output, when we do not have access to all the data, or when using all the data is too computationally expensive. This problem was simulated on the 1QBit SDK toolkit, in a form which can be run on a quantum annealer, showing that these problems are also amenable to quantum annealers.
QUANTUM MACHINE LEARNING
The field of machine learning broadly amounts to the design and implementation of algorithms that can be trained to perform a variety of tasks. These include pattern recognition, data classification, and many others. We call training the process of optimizing the algorithm’s parameters to recognize specific inputs (the training data). The trained algorithm can then be applied to assess new inputs. The field of classical machine learning has grown enormously, mainly due to hardware and algorithmic developments (allowing, for instance, to train deep learning networks). The basic principles of machine learning are at the root of several vastly successful fields, the most prominent of which — today — is neural networks.
While many quantum machine learning (QML) algorithms are potentially ground breaking, many of them require access to universal quantum computers. These are more advanced than quantum annealers, and technologically more challenging. In other words, while optimization problems can already benefit from the first generation of experimental quantum annealers, the implementation of certain QML algorithms won’t be possible until the technology has developed further.At the current rate of experimental progress, however, we believe this will happen sooner rather than later.
Let us return to the problem of credit scoring. The way this problem is typically dealt with relies on a machine learning method known as classification. Each customer is expressed as a vector with its coordinates representing the different characteristics of the customer. The training set is labeled, such that each vector belongs to a class (the loan risk). When given a new vector, the program must determine the class it is most likely to belong to. This area of machine learning is also at the heart of pattern recognition, which is extensively used for voice, facial recognition and, — essential in finance — for fraud detection.
Finding a new vector’s class may mean performing many high dimensional projections. This can rapidly limit the confidence with which we can assign a class to the new vector, particularly for pattern recognition applications, where the number of attributes considered is gigantic. As a result, methods for running classification algorithms on quantum computers generally focus on efficiently performing projection operations.
There are several suggestions to implement pattern recognition on quantum computers, two of which were recently realized experimentally. Additionally, an experimental implementation of support vector machines — the most used classification algorithm — was also realized on a quantum computer.
This problem is qualitatively different from pattern recognition: given a new data point, instead of attributing a class to it, we want to learn a numeric function from the training data set. This process, known as regression, is particularly useful when attempting an interpolation, and is consequently a core tool for economic forecasting — specifically for forecasting demand and predicting nonperforming loans. Regression algorithms are generally used to understand how the typical value of a response variable changes as an attribute is varied.
In most cases, the optimal fit parameters are found by minimizing the leastsquares error between the training data and the values predicted by the model. This is usually done by finding the inverse of the training data matrix, a task which can be extremely computationally expensive for typical datasets. There exists, however, a powerful linear algebra toolbox which allows us to diagonalize matrices on quantum computers exponentially faster than on classical computers. Alternatively, a method for running an altogether different regression algorithm, known as Gaussian process regression, has been proposed and showed to provide an exponential speedup relative to classical algorithms.
Principal component analysis
In portfolio optimization, it is essential to have a global vision of interest rates paths. A standard tool for doing this is a method known as principal component analysis (PCA). The same tool can be applied to asset selection and performance forecasting, where it is essential to have an idea of what characteristics are the best to predict the future behavior of the asset or its associated interest rates.
In practice, PCA mathematically amounts to finding dominant eigenvalues and eigenvectors of a very large matrix. Normally, the cost is prohibitive and, for reallife data, where there could be millions of stocks, this cost is astronomical.
It was recently shown that a version of this algorithm, the quantumPCA algorithm, could be run exponentially faster on a quantum processor. Specifically, this algorithm finds approximations to the principal components of a correlation matrix, with a computational cost exponentially lower than on a classical computer. This development should vastly broaden the spectrum of applicability of PCA, allowing us to estimate risk and maximize profit in situations that were not feasible using classical methods.
Neural networks and associated models
Neural networks have proved extremely successful at predicting markets and analyzing credit risk. The key to this success lies in their ability to tackle tasks which require intuitive judgment and to draw conclusions even from incomplete datasets. These properties have made neural networks essential for, e.g., financial timeseries prediction.
While forecasting from already trained machine learning algorithms is usually extremely efficient, the training itself can be computationally expensive. This overhead could be significantly reduced by training the neural network using a quantum annealer, such as the DWave. Once trained, the algorithm may be run on any classical computer. There are some lines of activity in this field:
– In an early implementation a DWave quantum computer has been used in a ProofofConcept to train a specific type of neural network (a Boltzmann Machine
– Alternatively, the training process could be spedup exponentially by using quantum PCA, which was described in the previous section.
Another possibility altogether is to design new, fully quantum neural network algorithms able to learn much more complex data patterns than those identifiable using a classical neural network. This is particularly interesting in the Hidden Markov models, which are commonly used for financial forecasting. Quantum Hidden Markov models may deliver better and faster forecasting.
QUANTUM AMPLITUDE ESTIMATION AND MONTE CARLO
The Monte Carlo method is a technique used to estimate a system’s properties stochastically, by statistically sampling realizations of the system. It is ubiquitous in science, with applications in physics, chemistry, engineering, and finance. Where it really shines is in dealing with extremely large or complex systems, which cannot be approached analytically or handled through other methods. In finance, the stochastic approach is typically used to simulate the effect of uncertainties affecting the financial object in question, which could be a stock, a portfolio, or an option. This makes Monte Carlo methods applicable to portfolio evaluation, personal finance planning, risk evaluation, and derivatives pricing.
The problem with Monte Carlo methods is that, if we want to obtain the most probable outcome of a wide distribution or obtain a result with a very small associated error, the required number of simulations can become gigantic. This is the case for stock market simulations, for instance, which are routinely daylong simulations. In this situation, obtaining a quantum speedup could make a notable difference.
An important ingredient toward a quantum accelerated Monte Carlo was recently suggested: Quantum Amplitude Estimation (QAE) algorithm. QAE can sample a probabilistic distribution quadratically faster than the next best classical method, allowing it to estimate expectation values extremely efficiently. In the following section, we describe two specific problems in finance which can be tackled using this method.
Pricing of financial derivatives
Financial derivatives contracts have a payoff that depends on the future price trajectory of some asset (which can have a stochastic nature). Brokers must know how to assign a fair price to the derivatives from the state of the market. This is the pricing problem. The classical approach to this problem is via simplified scenarios, such as the BlackScholesMerton model, and Monte Carlo sampling. Due to the growing number of derivative products, only Monte Carlo simulations are viable, but at a huge computational cost and lengthy execution times. A quantumaccelerated Monte Carlo algorithm was formulated which tackles this problem, providing a quadratic speedup.
Financial institutions need to be able to accurately manage and compute risk. One way to mathematically quantify the risk is through the Value at Risk (VaR) function, which measures the distribution of losses of a portfolio. An equally important quantity is the Conditional Value at Risk, which is the expected loss that occurs when the VaR breakpoint has been reached. These concepts are of importance in portfolio optimization.
Typically, in quantitative finance, VaR and CVaR are estimated using Monte Carlo sampling of the relevant probability distribution. By applying the QAE algorithm, it is possible to determine VaR and CVaR with excellent accuracy and a quadratic speedup relative to classical methods. It has been tested for some small examples on the IBM Q Experience Quantum Computer.
CONCLUSIONS AND PERSPECTIVES
We have reviewed ways in which quantum computing could disrupt finance. As we have seen, this field is developing at a striking rate, partly due to experimental developments in quantum hardware, which are surpassing all expectations, and partly due to conceptual leaps, which promise unprecedented speedups for widely applicable algorithms. We believe that before long quantum computers will play a key role in quantitative finance.
We caution the reader that a few experimental breakthroughs will be necessary before we can construct a universal quantum processor capable of surpassing presentday supercomputers. We will need, for instance, to vastly increase the quality of qubits to implement some of the algorithms detailed here. It is possible, however, that faulty quantum computers will find interesting applications far before we achieve faulttolerant quantum computing. We would expect it is in this area that the first real disruptions to finance will occur and urge researchers to investigate this fascinating direction of study.
QWA is helping to bridge the gap between quantum and business. The goto for providing suggestions, feedback and questions is our email address [email protected]
by Roman Orus (Institute of Physics, Johannes Gutenberg University; Donostia International Physics Center; Ikerbasque Foundation for Science; Quantum for Quants Commission, Quantum World Association) , Samuel Mugel (The Quantum Revolution Fund; Quantum for Quants Commission, Quantum World Association) , and Enrique Lizaso (Quantum for Quants Commission, Quantum World Association — QWA)
Quantum Income Machine Review
Quantum Machine Intelligence publishes original articles on cuttingedge experimental and theoretical research in all areas of quantum artificial intelligence. The Journal is unique in promoting a synthesis of machine learning, data science and computational intelligence research with quantum computing developments. Its primary goal is to foster the utilization of quantum computing for realworld problems so as to pave the way towards the next generation of artificial intelligence systems. The Journal also publishes innovative papers reporting on machine intelligence theories, methods and applications inspired by physics and nature, e.g. computational intelligence, fuzzy systems, evolutionary computation, machine and deep learning.
All papers submitted undergo a rigorous peer review to ensure their originality, timeliness, relevance and readability. The journal also welcomes occasional review articles and short communications in all of the abovementioned topic areas.
 The first scientific journal that highlights the synergies between quantum computing and artificial intelligence
 Promotes a synthesis of the research areas of machine learning and data science, and their engineering applications based on quantum technologies
 Fosters the application of quantum computing and artificial intelligence to address realworld problems

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