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Quantum computers manipulate qubits through operations called gates, and the Hadamard is one of the most important. It is often the first operation in a quantum algorithm, and understanding it unlocks much of what follows in this book. Here is
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Quantum teleportation transfers the exact quantum state of one particle to another particle at a distant location, without physically moving anything between them. Despite the name, it has nothing to do with science fiction transportation. It is a precisely defined
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Carpenters say “measure twice, cut once.” Quantum physicists would say “measure once, and whatever you had is gone.” Measurement in quantum mechanics isn’t a gentle peek at what’s inside. It’s the end of the road for the superposition you worked
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Entanglement is not just what happens when you pull your charging cables from your bag and find they are deeply connected. Some physicists would call that “string theory.” Quantessa explains what entanglement means in the quantum world. In 1935, Einstein,
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You probably know about Pi Day on March 14th. We use the first three digits of pi to celebrate math. World Quantum Day works the exact same way. Scientists observe it on April 14th to honor a fundamental rule of
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A simplistic view of the progression of quantum computers has three stages, each with a question: Stage 1: Can quantum computers be built at all, regardless of the quantity and quality of qubits? Stage 2: Can errors be detected and
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Some say that there are just two quantum algorithms today: Grover’s and Shor’s. While Shor’s gets all the headlines, Grover’s stands out because of its elegant simplicity. See a beautiful video explaining its operation here, created by 3Blue1Brown. By way
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In a week when Google announced it is starting a neutral-atom group, Atomique had two burning questions: Quantuessa will answer the second question. BTW, I sometimes get asked how I came to join QuEra and work on neutral atoms. About
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Imagine walking through an auto show and seeing a sleek, glowing concept car. The builder promises it will soon fly you to work while you sleep. That sounds amazing, but the cars actually driving outside are still running on gas
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In everyday life, things have definite states. A coin on a table is either heads or tails. But at the quantum scale, particles don’t work that way. A quantum particle like an atom or an electron can be prepared so
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