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The answer is in the second article you have linked:
Also see the following page: https://en.m.wikipedia.org/wiki/Physical_and_logical_qubits/TellDunkin
Basically, there are two types of qubit. Physical qubits are individual quantum systems, which are superimposed 0 and 1. Logical qubits are composed of many physical qubits, and are used to perform useful work within a circuit. Physical qubits can't be used directly within a circuit due to decoherence, but by grouping them together in to a logical qubit we can overcome this.
It's worth noting that Google's 53 qubits refers to physical qubits, so not even 1 logical qubit. Microsoft seem to be suggesting they can build a logical qubit using only 100 physical qubits, instead of the several thousands that other approaches need. Either way, we are still likely decades away from this threatening bitcoin.
The idea is that logical qubits can perform useful processing work when many of their underlying physical qubits have gone astray.
Also see the following page: https://en.m.wikipedia.org/wiki/Physical_and_logical_qubits/TellDunkin
Basically, there are two types of qubit. Physical qubits are individual quantum systems, which are superimposed 0 and 1. Logical qubits are composed of many physical qubits, and are used to perform useful work within a circuit. Physical qubits can't be used directly within a circuit due to decoherence, but by grouping them together in to a logical qubit we can overcome this.
It's worth noting that Google's 53 qubits refers to physical qubits, so not even 1 logical qubit. Microsoft seem to be suggesting they can build a logical qubit using only 100 physical qubits, instead of the several thousands that other approaches need. Either way, we are still likely decades away from this threatening bitcoin.
Thank you for sharing article and information. this is very helpful for beginner.
