Collectively Enhanced Interactions in Solid-State Spin Qubits

Editors' Suggestion

Collectively Enhanced Interactions in Solid-State Spin Qubits

Hendrik Weimer, Norman Y. Yao, and Mikhail D. Lukin

Phys. Rev. Lett. 110, 067601 – Published 4 February 2013

Abstract

We propose and analyze a technique to collectively enhance interactions between solid-state quantum registers composed from random networks of spin qubits. In such systems, disordered dipolar interactions generically result in localization. Here, we demonstrate the emergence of a single collective delocalized eigenmode as one turns on a transverse magnetic field. The interaction strength between this symmetric collective mode and a remote spin qubit is enhanced by the square root of the number of spins participating in the delocalized mode. Mediated by such collective enhancement, long-range quantum logic between remote spin registers can occur at distances consistent with optical addressing. A specific implementation utilizing nitrogen-vacancy defects in diamond is discussed and the effects of decoherence are considered.

Received 12 October 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.067601

Authors & Affiliations

Hendrik Weimer^1,2,*, Norman Y. Yao¹, and Mikhail D. Lukin¹

¹Physics Department, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA
²ITAMP, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA