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Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system

Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system
Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system

Experiments to probe the basic quantum properties of motional degrees of freedom of mechanical systems have developed rapidly over the last decade. One promising approach is to use hybrid electromechanical systems incorporating superconducting qubits and microwave circuitry. However, a critical challenge facing the development of these systems is to achieve strong coupling between mechanics and qubits while simultaneously reducing coupling of both the qubit and mechanical mode to the environment. Here we report measurements of a qubit-coupled mechanical resonator system consisting of an ultra-high-frequency nanoresonator and a long coherence-time superconducting transmon qubit, embedded in a superconducting coplanar waveguide cavity. It is demonstrated that the nanoresonator and transmon have commensurate energies and transmon coherence times are one order of magnitude larger than for all previously reported qubit-coupled nanoresonators. Moreover, we show that numerical simulations of this new hybrid quantum system are in good agreement with spectroscopic measurements and suggest that the nanoresonator in our device resides at low thermal occupation number, near its ground state, acting as a dissipative bath seen by the qubit. We also outline how this system could soon be developed as a platform for implementing more advanced experiments with direct relevance to quantum information processing and quantum thermodynamics, including the study of nanoresonator quantum noise properties, reservoir engineering, and nanomechanical quantum state generation and detection.

hybrid quantum systems, nanomechanics, quantum information, superconducting qubits
0957-4484
Rouxinol, F.
ecc639b3-86db-484d-a6c6-6648d7a0964e
Hao, Y.
d74e6f55-15ee-4b7e-ae81-622ad1e76019
Brito, F.
e924c539-60dd-42a9-bc29-cbc514d5bc01
Caldeira, A. O.
70be377c-9273-48e0-8547-6c42e88126c7
Irish, E. K.
b78b8d7c-c747-4437-bb6f-189186713998
Lahaye, M. D.
b92ef0cc-96b4-44e2-bab6-cd55df9f00ae
Rouxinol, F.
ecc639b3-86db-484d-a6c6-6648d7a0964e
Hao, Y.
d74e6f55-15ee-4b7e-ae81-622ad1e76019
Brito, F.
e924c539-60dd-42a9-bc29-cbc514d5bc01
Caldeira, A. O.
70be377c-9273-48e0-8547-6c42e88126c7
Irish, E. K.
b78b8d7c-c747-4437-bb6f-189186713998
Lahaye, M. D.
b92ef0cc-96b4-44e2-bab6-cd55df9f00ae

Rouxinol, F., Hao, Y., Brito, F., Caldeira, A. O., Irish, E. K. and Lahaye, M. D. (2016) Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system. Nanotechnology, 27 (36), [364003]. (doi:10.1088/0957-4484/27/36/364003).

Record type: Article

Abstract

Experiments to probe the basic quantum properties of motional degrees of freedom of mechanical systems have developed rapidly over the last decade. One promising approach is to use hybrid electromechanical systems incorporating superconducting qubits and microwave circuitry. However, a critical challenge facing the development of these systems is to achieve strong coupling between mechanics and qubits while simultaneously reducing coupling of both the qubit and mechanical mode to the environment. Here we report measurements of a qubit-coupled mechanical resonator system consisting of an ultra-high-frequency nanoresonator and a long coherence-time superconducting transmon qubit, embedded in a superconducting coplanar waveguide cavity. It is demonstrated that the nanoresonator and transmon have commensurate energies and transmon coherence times are one order of magnitude larger than for all previously reported qubit-coupled nanoresonators. Moreover, we show that numerical simulations of this new hybrid quantum system are in good agreement with spectroscopic measurements and suggest that the nanoresonator in our device resides at low thermal occupation number, near its ground state, acting as a dissipative bath seen by the qubit. We also outline how this system could soon be developed as a platform for implementing more advanced experiments with direct relevance to quantum information processing and quantum thermodynamics, including the study of nanoresonator quantum noise properties, reservoir engineering, and nanomechanical quantum state generation and detection.

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More information

Accepted/In Press date: 11 July 2016
e-pub ahead of print date: 2 August 2016
Published date: 2 August 2016
Keywords: hybrid quantum systems, nanomechanics, quantum information, superconducting qubits

Identifiers

Local EPrints ID: 438914
URI: http://eprints.soton.ac.uk/id/eprint/438914
ISSN: 0957-4484
PURE UUID: 29e0f175-88aa-4276-b1ac-d917e19caf32

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Date deposited: 26 Mar 2020 17:34
Last modified: 13 Nov 2020 17:31

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Contributors

Author: F. Rouxinol
Author: Y. Hao
Author: F. Brito
Author: A. O. Caldeira
Author: E. K. Irish
Author: M. D. Lahaye

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