Immunity of information encoded in decoherence-free subspaces to particle loss

Details Immunity of information encoded in decoherence-free subspaces to particle loss Immunity of information encoded in decoherence-free subspaces to particle loss

2011-07-19

arxiv.org/abs/1107.3786v2

Phys. Rev. A 84, 052318 (2011)

Physics

Quantum Physics

to appear in Phys. Rev. A; 5 pages, 2 figures; content changed a bit (the property demonstrated explicitly on a 4 qubit state)

Scientific paper

10.1103/PhysRevA.84.052318

We demonstrate that for an ensemble of qudits, subjected to collective decoherence in the form of perfectly correlated random SU(d) unitaries, quantum superpositions stored in the decoherence free subspace are fully immune against the removal of one particle. This provides a feasible scheme to protect quantum information encoded in the polarization state of a sequence of photons against both collective depolarization and one photon loss, and can be demonstrated with photon quadruplets using currently available technology.

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