dorsal/arxiv
View SchemaSuppression of decoherence in quantum registers by entanglement with a nonequilibrium environment
| Authors | S. Gheorghiu-Svirschevski |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0112045 |
| URL | https://arxiv.org/abs/quant-ph/0112045 |
| DOI | 10.1103/PhysRevA.66.032101 |
Abstract
It is shown that a nonequilibrium environment can be instrumental in suppressing decoherence between distinct decoherence free subspaces in quantum registers. The effect is found in the framework of exact coherent-product solutions for model registers decohering in a bath of degenerate harmonic modes, through couplings linear in bath coordinates. These solutions represent a natural nonequilibrium extension of the standard solution for a decoupled initial register state and a thermal environment. Under appropriate conditions, the corresponding reduced register distribution can propagate in an unperturbed manner, even in the presence of entanglement between states belonging to distinct decoherence free subspaces, and despite persistent bath entanglement. As a byproduct, we also obtain a refined picture of coherence dynamics under bang-bang decoherence control. In particular, it is shown that each radio-frequency pulse in a typical bang-bang cycle induces a revival of coherence, and that these revivals are exploited in a natural way by the time-symmetrized version of the bang-bang protocol.
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"abstract": "It is shown that a nonequilibrium environment can be instrumental in\nsuppressing decoherence between distinct decoherence free subspaces in quantum\nregisters. The effect is found in the framework of exact coherent-product\nsolutions for model registers decohering in a bath of degenerate harmonic\nmodes, through couplings linear in bath coordinates. These solutions represent\na natural nonequilibrium extension of the standard solution for a decoupled\ninitial register state and a thermal environment. Under appropriate conditions,\nthe corresponding reduced register distribution can propagate in an unperturbed\nmanner, even in the presence of entanglement between states belonging to\ndistinct decoherence free subspaces, and despite persistent bath entanglement.\nAs a byproduct, we also obtain a refined picture of coherence dynamics under\nbang-bang decoherence control. In particular, it is shown that each\nradio-frequency pulse in a typical bang-bang cycle induces a revival of\ncoherence, and that these revivals are exploited in a natural way by the\ntime-symmetrized version of the bang-bang protocol.",
"arxiv_id": "quant-ph/0112045",
"authors": [
"S. Gheorghiu-Svirschevski"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.66.032101",
"title": "Suppression of decoherence in quantum registers by entanglement with a nonequilibrium environment",
"url": "https://arxiv.org/abs/quant-ph/0112045"
},
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