Perfect Quantum Error Correction Code

Details Perfect Quantum Error Correction Code Perfect Quantum Error Correction Code

1996-02-27

arxiv.org/abs/quant-ph/9602019v1

Physics

Quantum Physics

4 pages (including figures), latex file using RevTex

Scientific paper

We present a quantum error correction code which protects a qubit of information against general one qubit errors which maybe caused by the interaction with the environment. To accomplish this, we encode the original state by distributing quantum information over five qubits, the minimal number required for this task. We give a simple circuit which takes the initial state with four extra qubits in the state |0> to the encoded state. The circuit can be converted into a decoding one by simply running it backward. Reading the extra four qubits at the decoder's output we learn which one of the sixteen alternatives (no error plus all fifteen possible 1-bit errors) was realized. The original state of the encoded qubit can then be restored by a simple unitary transformation.

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