Proposal for a Nanomechanical Qubit

Mechanical oscillators have been demonstrated with very high quality factors over a wide range of frequencies. They also couple to a wide variety of fields and forces, making them ideal as sensors. The realization of a mechanically based quantum bit could therefore provide an important new platform...

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Autores principales:	F. Pistolesi, A. N. Cleland, A. Bachtold
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/f19de28aa4894682a0c9ff928f6439df
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spelling	oai:doaj.org-article:f19de28aa4894682a0c9ff928f6439df2021-12-02T18:47:51ZProposal for a Nanomechanical Qubit10.1103/PhysRevX.11.0310272160-3308https://doaj.org/article/f19de28aa4894682a0c9ff928f6439df2021-08-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031027http://doi.org/10.1103/PhysRevX.11.031027https://doaj.org/toc/2160-3308Mechanical oscillators have been demonstrated with very high quality factors over a wide range of frequencies. They also couple to a wide variety of fields and forces, making them ideal as sensors. The realization of a mechanically based quantum bit could therefore provide an important new platform for quantum computation and sensing. Here, we show that by coupling one of the flexural modes of a suspended carbon nanotube to the charge states of a double quantum dot defined in the nanotube, it is possible to induce sufficient anharmonicity in the mechanical oscillator so that the coupled system can be used as a mechanical quantum bit. However, these results can only be achieved when the device enters the ultrastrong coupling regime. We discuss the conditions for the anharmonicity to appear, and we show that the Hamiltonian can be mapped onto an anharmonic oscillator, allowing us to work out the energy level structure and find how decoherence from the quantum dot and the mechanical oscillator is inherited by the qubit. Remarkably, the dephasing due to the quantum dot is expected to be reduced by several orders of magnitude in the coupled system. We outline qubit control, readout protocols, the realization of a CNOT gate by coupling two qubits to a microwave cavity, and finally how the qubit can be used as a static-force quantum sensor.F. PistolesiA. N. ClelandA. BachtoldAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031027 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 F. Pistolesi A. N. Cleland A. Bachtold Proposal for a Nanomechanical Qubit
description	Mechanical oscillators have been demonstrated with very high quality factors over a wide range of frequencies. They also couple to a wide variety of fields and forces, making them ideal as sensors. The realization of a mechanically based quantum bit could therefore provide an important new platform for quantum computation and sensing. Here, we show that by coupling one of the flexural modes of a suspended carbon nanotube to the charge states of a double quantum dot defined in the nanotube, it is possible to induce sufficient anharmonicity in the mechanical oscillator so that the coupled system can be used as a mechanical quantum bit. However, these results can only be achieved when the device enters the ultrastrong coupling regime. We discuss the conditions for the anharmonicity to appear, and we show that the Hamiltonian can be mapped onto an anharmonic oscillator, allowing us to work out the energy level structure and find how decoherence from the quantum dot and the mechanical oscillator is inherited by the qubit. Remarkably, the dephasing due to the quantum dot is expected to be reduced by several orders of magnitude in the coupled system. We outline qubit control, readout protocols, the realization of a CNOT gate by coupling two qubits to a microwave cavity, and finally how the qubit can be used as a static-force quantum sensor.
format	article
author	F. Pistolesi A. N. Cleland A. Bachtold
author_facet	F. Pistolesi A. N. Cleland A. Bachtold
author_sort	F. Pistolesi
title	Proposal for a Nanomechanical Qubit
title_short	Proposal for a Nanomechanical Qubit
title_full	Proposal for a Nanomechanical Qubit
title_fullStr	Proposal for a Nanomechanical Qubit
title_full_unstemmed	Proposal for a Nanomechanical Qubit
title_sort	proposal for a nanomechanical qubit
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/f19de28aa4894682a0c9ff928f6439df
work_keys_str_mv	AT fpistolesi proposalforananomechanicalqubit AT ancleland proposalforananomechanicalqubit AT abachtold proposalforananomechanicalqubit
_version_	1718377657662439424

Proposal for a Nanomechanical Qubit

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