{title2=QEC}
{wiki}

Technique that uses multiple non-<ideal> qubits (physical qubits) to simulate/produce one perfect qubit (logical).

One is philosophically reminded of classical <error correction codes>, where we also have multiple input bits per actual information bit.

TODO understand in detail. This appears to be a fundamental technique since all physical systems we can manufacture are imperfect.

Part of the fundamental interest of this technique is due to the <quantum threshold theorem>.

For example, when https://www.bloomberg.com/news/articles/2020-04-06/quantum-computing-startup-raises-215-million-for-faster-device[PsiQuantum raised 215M in 2020], they announced that they intended to reach 1 million physical qubits, which would achieve between 100 and 300 logical qubits.

<video Jeremy O'Brien: "Quantum Technologies" by GoogleTechTalks (2014)> https://youtu.be/7wCBkAQYBZA?t=2778 describes an error correction approach for a <photonic quantum computer>.

Bibliography:
* https://errorcorrectionzoo.org/domain/quantum_domain


Quantum error correction

ID: quantum-error-correction