Quantum computing is in the midst of the so-called NISQ era – a time of noisy intermediate scale quantum devices based a variety of qubit modalities, all of which are too error-prone for practical computing. While the qubit zoo keeps growing – superconducting, trapped ions, neutral atoms, photonics, spin qubits, and more – its members still share (at least so far) untenable error rates. You often hear that 1000 physical qubits could be required to build a single logical qubit, and that many 1000s of logical qubits will be needed to gain true quantum advantage.
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