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Many-Body Singlet Prepared by a Central-Spin Qubit

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Zaporski, L 
Le Gall, C 

Abstract

Controllable quantum many-body systems are platforms for fundamental investigations into the nature of entanglement and promise to deliver computational speed-up for a broad class of algorithms and simulations. In particular, engineering entanglement within a dense spin ensemble can turn it into a robust quantum memory or a computational platform. Recent experimental progress in dense central spin systems motivates the design of algorithms that use a central-spin qubit as a convenient proxy for the ensemble. Here we propose a protocol that uses a central spin to initialize two dense spin ensembles into a pure anti-polarized state and from there creates a many-body entangled state – a singlet – from the combined ensemble. We quantify the protocol performance for multiple material platforms and show that it can be implemented even in the presence of realistic levels of decoherence and diffusion. Our protocol introduces an algorithmic approach to the preparation of a known many-body state and to entanglement engineering in a dense spin ensemble, which can be extended towards a broad class of collective quantum states.

Description

Keywords

5108 Quantum Physics, 51 Physical Sciences, Bioengineering

Journal Title

PRX Quantum

Conference Name

Journal ISSN

2691-3399
2691-3399

Volume Title

Publisher

American Physical Society (APS)
Sponsorship
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (862035)
EPSRC DTP