How many physical qubits are needed to encode a logical qubit on an
-- ion trap,
-- superconducting,
-- neutral atom,
-- photonic,
-- spin
quantum computer based on today's technologies?
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1$\begingroup$ This is pretty broad right now. Maybe consider asking “what factors determine the number of physical qubits needed to encode a logical qubit, as applied to current (2021) devices?” $\endgroup$– Mark SpinelliNov 19, 2021 at 3:54
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$\begingroup$ What do you mean by "encode a logical bit"? Qubits are a superset of regular 0/1 bits. I can just use the collapsed state of a Qubit as a classical bit...but that wouldn't be very wise since I could just use a regular bit for that. $\endgroup$– Bertrand Einstein IVNov 19, 2021 at 20:00
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$\begingroup$ The answer depends on quantum error correction codes, which you use. Any ECC performs exactly the same regardless of the physical medium. The only difference is: "is this QC scheme has enough gate fidelity for this ECC to be effective?" $\endgroup$– totikomNov 22, 2021 at 18:11
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$\begingroup$ @totikom, thank you for the comments. So the original question is, given the fidelity of different QC hardware, how many physical qubits will be required to encode a logical qubit ? $\endgroup$– davidNov 24, 2021 at 17:57
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