Yao, Norman Y. and Gong, Zhe-Xuan and Laumann, Chris R. and Bennett, Steven D. and Duan, L.-M. and Lukin, Mikhail D. and Jiang, Liang and Gorshkov, Alexey V. (2012) Quantum Logic between Remote Quantum Registers. . (Submitted) http://resolver.caltech.edu/CaltechAUTHORS:20121102-134811889
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We analyze two approaches to quantum state transfer in solid-state spin systems. First, we consider unpolarized spin-chains and extend previous analysis to various experimentally relevant imperfections, including 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 consider the extension of the protocol to bosonic systems of coupled oscillators. Second, we introduce a quantum mirror based architecture for universal quantum computing which exploits all of the 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, as an example, we demonstrate that eigenmode-mediated state transfer can enable robust long-range logic between spatially separated Nitrogen-Vacancy registers in diamond; numerical simulations confirm that high fidelity gates are achievable even in the presence of moderate disorder.
|Item Type:||Report or Paper (Discussion Paper)|
|Additional Information:||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 (FG02-97ER25308), CUA, DARPA, AFOSR MURI and NIST. AVG acknowledges support from the Lee A. DuBridge Foundation. LJ acknowledges support from the Sherman Fairchild Foundation and the NBRPC. AVG and LJ acknowledge the IQIM, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation. The Michigan group was supported by the ARO and the AFOSR MURI program, the IARPA MUSIQC program, the DARPA OLE program, and the NBRPC (973 Program) 2011CBA00300 (2011CBA00302).|
|Group:||IQIM, Institute for Quantum Information and Matter|
|Classification Code:||PACS: 03.67.Lx, 03.67.Hk, 05.50.+q, 75.10.Dg|
|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:||27 Dec 2012 02:58|
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