Engineering quantum decoherence of charge qubit via a nanomechanical resonator |
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Authors: | Wang Y. D. Gao Y. B. Sun C. P. |
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Affiliation: | (1) Institute of Theoretical Physics, the Chinese Academy of Science, 100080 Beijing, P.R. China;(2) Applied Physics Department, Beijing University of Technology, 100022 Beijing, P.R. China |
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Abstract: | We propose a theoretical scheme to observe the loss of quantum coherence through the coupling of the superconducting charge qubit system to a nanomechanical resonator (NAMR), which has already been successfully fabricated in experiment and is convenient to manipulate. With a similar form to the usual cavity QED system, this qubit-NAMR composite system with engineered coupling exhibits the collapse and revival phenomenon in a progressive decoherence process. Corresponding to the two components of superposition of the two charge eigenstates, the state of the nanomechanical resonator evolves simultaneously towards two distinct quasi-classical states. Therefore the generalized which way detection by the NAMR induces the quantum decoherence of the charge qubit.Received: 21 May 2004, Published online: 9 September 2004PACS: 03.65.-w Quantum mechanics - 74.50. + r Tunneling phenomena; point contacts, weak links, Josephson effects - 03.67.Lx Quantum computation - 85.25.Dq Superconducting quantum interference devices (SQUIDs) |
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