Nanomechanical Quantum Memory for Superconducting Qubits

Details Nanomechanical Quantum Memory for Superconducting Qubits Nanomechanical Quantum Memory for Superconducting Qubits

2004-10-04

arxiv.org/abs/quant-ph/0410029v1

Physics

Quantum Physics

4 pages, Revtex

Scientific paper

10.1103/PhysRevA.72.010301

Many protocols for quantum computation require a quantum memory element to store qubits. We discuss the accuracy with which quantum states prepared in a Josephson junction qubit can be stored in a nanoelectromechanical resonator and then transfered back to the junction. We find that the fidelity of the memory operation depends on both the junction-resonator coupling strength and the location of the state on the Bloch sphere. Although we specifically focus on a large-area, current-biased Josesphson junction phase qubit coupled to the dilatational mode of a piezoelectric nanoelectromechanical disk resonator, many our results will apply to other qubit-oscillator models.

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