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<p><br>Quantum finance is an interdisciplinary research field, applying theories and methods developed by quantum physicists and economists in order to solve problems in finance. It is a branch of econophysics.</p>
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<p id="isPasted">I actually think this is a pretty big deal, as finance now relies heavily on digital technologies like encryption. Quantum computing of course has a lot of benefits, and if it’s phased in responsibly, with cryptographic algorithms adjusted ahead of time — see e.g. Hunter Johnson's answer to What effect will quantum computing have on Bitcoin? — it can strengthen the financial system. We can have faster payments, more efficient markets, faster price discovery, etc.</p><p>However, imagine if a rogue actor builds a quantum computer in secret. There’s tons of legacy tech across the financial system that can be hacked. …</p>
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<p id="isPasted">Not yet. Quantum computers by themselves would not help with markets. There would need to be a whole architecture and frameworks developed that combine classical computers and quantum computers. People are working on that. We shall see in 5 - 10 years. Could be helpful.</p><p>Personally, for the algorithms that I have built to date, massive parrallel processing using classical CPUs is more than sufficient. Solving markets to whatever degree markets can be solved is not something that quantum computers are really needed for.</p><p>Chemistry will be the first big commercial application. The most important application of quantum computers that …</p>
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<p id="isPasted">You can have photons with horizontal or vertical polarization, right? If you rotate the filters, you still get horizontal or vertical, it’s just that the probabilities of measuring one or the other change.</p><p>When the bank creates a “bank note”, they give it a serial number and encode some pattern of ones and zeroes in the polarization of photons, but don’t say in which base (which rotation) they should be measured.</p><p>When they want to check whether a bank note is authentic, they look up the serial number, and do the measurements in the correct bases for that bank note, …</p>
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<p><br>As a marketing tool to attract physics and math PhDs to quantitative finance. In general, finance is pretty liberal about making the math involved seem hard / interesting. To be sure, there are intellectually interesting problems to solve, but maybe something like 0.01% of the work in quantitative finance actually involves anything from quantum mechanics, QFT, or string theory -- and even that may not be at the top research groups / most profitable companies.</p>
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