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arxiv 1604.07198 v2 pith:4SGU7X7G submitted 2016-04-25 quant-ph cond-mat.mes-hall

Purification and switching protocols for dissipatively stabilized entangled qubit states

classification quant-ph cond-mat.mes-hall
keywords entangledqubitsstatesauxiliarycavitycoupledfidelitiesmodes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Pure dephasing processes limit the fidelities achievable in driven-dissipative schemes for stabilization of entangled states of qubits. We propose a scheme which, combined with already existing entangling methods, purifies the desired entangled state by driving out of equilibrium auxiliary dissipative cavity modes coupled to the qubits. We lay out the specifics of our scheme and compute its efficiency in the particular context of two superconducting qubits in a cavity-QED architecture, where the strongly coupled auxiliary modes provided by collective cavity excitations can drive and sustain the qubits in maximally entangled Bell states with fidelities reaching 90% for experimentally accessible parameters.

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