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Optical implementation of a unitarily correctable code

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arxiv 0909.1584 v1 pith:2JGWRNWC submitted 2009-09-08 quant-ph

Optical implementation of a unitarily correctable code

classification quant-ph
keywords correctablequantumunitarilycodeimplementationcorrectionerrorinformation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Noise poses a challenge for any real-world implementation in quantum information science. The theory of quantum error correction deals with this problem via methods to encode and recover quantum information in a way that is resilient against that noise. Unitarily correctable codes are an error correction technique wherein a single unitary recovery operation is applied without the need for an ancilla Hilbert space. Here, we present the first optical implementation of a non-trivial unitarily correctable code for a noisy quantum channel with no decoherence-free subspaces or noiseless subsystems. We show that recovery of our initial states is achieved with high fidelity (>=0.97), quantitatively proving the efficacy of this unitarily correctable code.

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