Quantum computing in plain English, with interactive simulations.https://qsmu.com/https://qsmu.com/blog/how-much-bitcoin-could-a-quantum-computer-steal/https://qsmu.com/blog/how-much-bitcoin-could-a-quantum-computer-steal/Between about 1.7 and 7 million bitcoin have a public key visible on the blockchain, which is what a quantum attack needs. Which coins those are, and what Bitcoin is doing about it.Sun, 11 Oct 2026 00:00:00 GMThttps://qsmu.com/blog/what-do-quantum-computing-companies-earn/https://qsmu.com/blog/what-do-quantum-computing-companies-earn/Four listed quantum computing companies took in about $280 million in the year to June 2026, and the stock market valued them at about $28 billion. Where the revenue comes from and where the money to keep going comes from, from their filings.Sun, 11 Oct 2026 00:00:00 GMThttps://qsmu.com/blog/what-would-q-day-mean-for-your-bank/https://qsmu.com/blog/what-would-q-day-mean-for-your-bank/Card payments and PINs are mostly safe from quantum computers. Online banking sessions, stored records and the keys that prove a message really came from a bank are not. A system-by-system look.Sun, 11 Oct 2026 00:00:00 GMThttps://qsmu.com/blog/when-will-quantum-computers-help-make-medicines/https://qsmu.com/blog/when-will-quantum-computers-help-make-medicines/The chemistry calculations that could help with drug design need about 1,000 to 1,500 error-corrected qubits. The largest demonstrations have about 70. What's been done so far, and where quantum computing would fit in making a drug.Sun, 11 Oct 2026 00:00:00 GMThttps://qsmu.com/learn/bits-and-qubits/https://qsmu.com/learn/bits-and-qubits/What a qubit is, what it's made of, and how it differs from a bit.https://qsmu.com/learn/measurement/https://qsmu.com/learn/measurement/Why reading a qubit gives a single 0 or 1, and what the amplitudes have to do with it.https://qsmu.com/learn/interference/https://qsmu.com/learn/interference/How amplitudes add up or cancel out, using one qubit and two operations.https://qsmu.com/learn/search/https://qsmu.com/learn/search/Grover's algorithm, step by step, finding one code out of sixteen.