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International Conference on Quantum, Nano and Micro Technologies (ICQNM)

A Scheme to Entangle Nanomechanical Resonators and Microwave Cavities

P. Tombesi, David Vitali, Andrew C. Doherty, Gerard J Milburn, M. J. Woolley

Published Feb 1, 2008• 0 citations
Publisher

Abstract

A scheme able to entangle at the steady state a nanomechanical resonator with a microwave cavity mode of a driven superconducting coplanar waveguide is proposed. The nanomechanical resonator is capacitively coupled with the central conductor of the waveguide and stationary entanglement is achievable up to temperatures of tens of milliKelvin. Although not easy to reach experimentally it would provide a viable way to entangling many nano resonators via a common cavity field.

DOI
10.1109/icqnm.2008.10

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A scheme able to entangle at the steady state a nanomechanical resonator with a microwave cavity mode of a driven superconducting coplanar waveguide is proposed. The nanomechanical resonator is capacitively coupled with the central conductor of the waveguide and stationary entanglement is achievable up to temperatures of tens of milliKelvin. Although not easy to reach experimentally it would provide a viable way to entangling many nano resonators via a common cavity field.
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We describe a possible implementation of the nanomechanical quantum superposition generation and detection scheme described in the preceding, companion paper (Armour A D and Blencowe M P 2008 New. J. Phys. 10 095004). The implementation is based on the circuit quantum electrodynamics (QED) set-up, with the addition of a mechanical degree of freedom formed out of a suspended, doubly-clamped segment of the superconducting loop of a dc SQUID located directly opposite the centre conductor of a coplanar waveguide (CPW). The relative merits of two SQUID based qubit realizations are addressed, in particular a capacitively coupled charge qubit and inductively coupled flux qubit. It is found that both realizations are equally promising, with comparable qubit–mechanical resonator mode as well as qubit–microwave resonator mode coupling strengths.