Quantum memories based on engineered dissipation

Details Quantum memories based on engineered dissipation Quantum memories based on engineered dissipation

2010-10-14

arxiv.org/abs/1010.2901v2

Phys. Rev. A 83, 012304 (2011)

Physics

Quantum Physics

6 +8 pages, 4 figures, Includes minor corrections updated references and aknowledgements

Scientific paper

10.1103/PhysRevA.83.012304

Storing quantum information for long times without disruptions is a major requirement for most quantum information technologies. A very appealing approach is to use self-correcting Hamiltonians, i.e. tailoring local interactions among the qubits such that when the system is weakly coupled to a cold bath the thermalization process takes a long time. Here we propose an alternative but more powerful approach in which the coupling to a bath is engineered, so that dissipation protects the encoded qubit against more general kinds of errors. We show that the method can be implemented locally in four dimensional lattice geometries by means of a toric code, and propose a simple 2D set-up for proof of principle experiments.

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