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Unconditional measurement-based quantum computation with optomechanical continuous variables

Houhou, Oussama; Moore, Darren W; Bose, Sougato; Ferraro, Alessandro; (2022) Unconditional measurement-based quantum computation with optomechanical continuous variables. Physical Review A , 105 (1) , Article 012610. 10.1103/PhysRevA.105.012610. Green open access

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Abstract

Universal quantum computation encoded over continuous variables can be achieved via Gaussian measurements acting on entangled non-Gaussian states. However, due to the weakness of available nonlinearities, generally these states can only be prepared conditionally, potentially with low probability. Here we show how universal quantum computation could be implemented unconditionally using an integrated platform able to sustain both linear and quadratic optomechanical-like interactions. Specifically, considering cavity opto- and electromechanical systems, we propose a realization of a driven-dissipative dynamics that deterministically prepares the required non-Gaussian cluster states—entangled squeezed states of multiple mechanical oscillators suitably interspersed with cubic-phase states. We next demonstrate how arbitrary Gaussian measurements on the cluster nodes can be performed by continuously monitoring the output cavity field. Finally, the feasibility requirements of this approach are analyzed in detail, suggesting that its building blocks are within reach of current technology.

Type: Article
Title: Unconditional measurement-based quantum computation with optomechanical continuous variables
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevA.105.012610
Publisher version: https://doi.org/10.1103/PhysRevA.105.012610
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Optomechanics, Quantum computation, Quantum information processing with continuous variables, Quantum optics
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10143490
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