Tuesday, February 19, 2013

1302.3998 (Daniel Becker et al.)

Dynamic Generation of Topologically Protected Self-Correcting Quantum

Daniel Becker, Tetsufumi Tanamoto, Adrian Hutter, Fabio L. Pedrocchi, Daniel Loss
We propose a scheme to dynamically realize a thermally stable quantum memory based on the toric code. The code is generated from qubit systems with typical two-body interactions (Ising, XY, Heisenberg) using periodic, NMR-like, pulse sequences. It allows one to encode the logical qubits without measurements and to protect them dynamically against the time evolution of the physical qubits. Thermal stability is achieved by weakly coupling the qubits to additional cavity modes that mediate long-range attractive interactions between the stabilizer operators of the toric code. We investigate how the fidelity, with which the toric code is realized, depends on the period length T of the pulse sequence and the magnitude of possible pulse errors. We derive an optimal period T_opt that maximizes the fidelity.
View original: http://arxiv.org/abs/1302.3998

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