Yao, N. Y. and Gong, Z.-X. and Laumann, C. R. and Bennett, S. D. and Duan, L.-M. and Lukin, M. D. and Jiang, L. and Gorshkov, A. V. (2013) Quantum Logic between Remote Quantum Registers. Physical Review A, 87 (2). Art. No. 022306. ISSN 1050-2947. http://resolver.caltech.edu/CaltechAUTHORS:20121102-134811889
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We consider two approaches to dark-spin-mediated quantum computing in hybrid solid-state spin architectures. First, we review the notion of eigenmode-mediated unpolarized spin-chain state transfer and extend the analysis to various experimentally relevant imperfections: quenched disorder, dynamical decoherence, and uncompensated long-range coupling. In finite-length chains, the interplay between disorder-induced localization and decoherence yields a natural optimal channel fidelity, which we calculate. Long-range dipolar couplings induce a finite intrinsic lifetime for the mediating eigenmode; extensive numerical simulations of dipolar chains of lengths up to L=12 show remarkably high fidelity despite these decay processes. We further briefly consider the extension of the protocol to bosonic systems of coupled oscillators. Second, we introduce a quantum mirror based architecture for universal quantum computing that exploits all of the dark spins in the system as potential qubits. While this dramatically increases the number of qubits available, the composite operations required to manipulate dark-spin qubits significantly raise the error threshold for robust operation. Finally, we demonstrate that eigenmode-mediated state transfer can enable robust long-range logic between spatially separated nitrogen-vacancy registers in diamond; disorder-averaged numerics confirm that high-fidelity gates are achievable even in the presence of moderate disorder.
|Additional Information:||© 2013 American Physical Society. Received 30 May 2012; revised manuscript received 15 December 2012; published 6 February 2013. We gratefully acknowledge the insights of and conversations with Pierre Meystre, Alex Zhai, Sidd Viswanathan, Peter Komar, and Hendrik Weimer. This work was supported by the NSF, DOE, CUA, DARPA, AFOSR MURI, NIST, Lee A. DuBridge Foundation, Sherman Fairchild Foundation, IQIM, and the Gordon and Betty Moore Foundation. Z.-X.G. and L.-M.D. were supported by the ARO and the AFOSR MURI program, the IARPA MUSIQC program, the DARPA OLE program, and the NBRPC (973 Program Grants No. 2011CBA00300 and No. 2011CBA00302).|
|Group:||IQIM, Institute for Quantum Information and Matter|
|Classification Code:||PACS: 03.67.Lx, 03.67.Hk, 05.50.+q, 75.10.Pq|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||03 Nov 2012 04:55|
|Last Modified:||07 Jun 2013 22:08|
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