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HL: Fachverband Halbleiterphysik

HL 89: Focus Session: Quantum Information Systems (jointly with MA,TT)

HL 89.3: Vortrag

Donnerstag, 29. März 2012, 17:15–17:30, ER 164

A quantum memory intrinsic to single nitrogen-vacancy centres in diamond — Gregory D. Fuchs¹, •Guido Burkard², Paul V. Klimov¹, and David D. Awschalom¹ — ¹Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA — ²Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

A quantum memory, composed of a long-lived qubit coupled to each processing qubit, is important to building a scalable platform for quantum information science. These two qubits should be connected by a fast and high-fidelity operation to store and retrieve coherent quantum states. Here, we demonstrate a room-temperature quantum memory based on the spin of the nitrogen nucleus intrinsic to each nitrogen-vacancy (NV) centre in diamond [1]. We perform coherent storage of a single NV centre electronic spin in a single nitrogen nuclear spin using Landau-Zener transitions across a hyperfine-mediated avoided level crossing. By working outside the asymptotic regime, we demonstrate coherent state transfer in as little as 120 ns with total storage fidelity of 88 ± 6%. This work demonstrates the use of a quantum memory that is compatible with scaling as the nitrogen nucleus is deterministically present in each NV centre defect.

[1] G. D. Fuchs, G. Burkard, P. V. Klimov, and D.D. Awschalom, Nature Physics 7, 789 (2011).