, Volume 153, Issue 5-6, pp 294-303
Date: 04 Oct 2008

Enhancement of Sudden Death of Entanglement for Driven Qubits

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We study the recently discovered phenomena of sudden death of entanglement for a system of two qubits, each of them independently longitudinally damped by a reservoir and subjected to a continuous driving. We show that driving produces, in the interaction picture, an effective bath that has elements amounting to various extra sources of noise (transverse, thermal squeezed, thermal longitudinal). As a result, the time of sudden death decreases due to driving, which we verify as well by direct numerical calculation. We suggest that this phenomenon can be studied systematically using superconducting qubits driven by microwave fields.

This work was supported by the Academy of Finland (Acad. Res. Fellowship 00857 and projects 7111994 and 7118122).