Continuous quantum error correction through local operations

Journal Article · Wed Sep 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.032327· OSTI ID:21448665

Mascarenhas, Eduardo; Franca Santos, Marcelo ^[1]; Marques, Breno ^[1]; Terra Cunha, Marcelo ^[2]

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1. Departamento de Fisica, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte (Brazil)
2. Departamento de Matematica, Universidade Federal de Minas Gerais, 30123-970, Belo Horizonte (Brazil)

We propose local strategies to protect global quantum information. The protocols, which are quantum error-correcting codes for dissipative systems, are based on environment measurements, direct feedback control, and simple encoding of the logical qubits into physical qutrits whose decaying transitions are indistinguishable and equally probable. The simple addition of one extra level in the description of the subsystems allows for local actions to fully and deterministically protect global resources such as entanglement. We present codes for both quantum jump and quantum state diffusion measurement strategies and test them against several sources of inefficiency. The use of qutrits in information protocols suggests further characterization of qutrit-qutrit disentanglement dynamics, which we also give together with simple local environment measurement schemes able to prevent distillability sudden death and even enhance entanglement in situations in which our feedback error correction is not possible.

• OSTI ID: 21448665
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONTROL
CORRECTIONS
CRYPTOGRAPHY
DIFFUSION
ERRORS
FEEDBACK
INFORMATION
MECHANICS
QUANTUM CRYPTOGRAPHY
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
QUANTUM MECHANICS
QUANTUM STATES
QUBITS
SECRECY PROTECTION