QTh4A.1.pdf Research in Optical Sciences © OSA 2014
Quantum Measurements using Diamond Spins:
From Fundamental Tests to Long-Distance Teleportation
Ronald Hanson
Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology P.O. Box 5046, 2600 GA Delft, The Netherlands
Author e-mail address: r.hanson@tudelft.nl
Abstract: Spin qubits in diamond provide an excellent platform both for fundamental tests and for realizing extended quantum networks . Here we present our latest results, including the deterministic teleportation over three meters.
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OCIS codes: (270.5585) Quantum information and processing; (270.5565) Quantum communication
1. Introduction to the style guide, formatting of main text, and page layout
A future Quantum Internet - an optically connected network of small quantum processors - will enable secure information exchange, clustering of quantum computers and blind quantum computing “in the cloud”. Here we present our progress towards scalable quantum networks based on solid-state qubits. We have entangled two electron spin qubits separated by 3 meters, each associated with a nitrogen vacancy center in diamond [1]. The entangled state is generated by a projective quantum measurement on single photons emitted by the qubits.
More recent work focusses on combining this heralded remote entanglement with recently achieved methods for initializing, controlling and entangling nuclear spin qubits near each electron spin [2,3], thus enabling deterministic quantum teleportation and quantum error correction, and paving the road for the implementation of an elementary quantum repeater and distributed quantum computing. At the same time, the “quantum toolbox” developed for these purposes is also used for fundamental tests of quantum measurements such as in violation of Leggett-Garg inequalities with projective measurements [4] and steering a qubit’s trajectory by adaptive partial measurements with feedback [5]. Latest results will be presented.
2. References
[1] H. Bernien et al., “Heralded entanglement between solid-state qubits separated by three meters”, Nature 497, 86 (2013). [2] W. Pfaff et al., “Demonstration of entanglement-by-measurement of solid state qubits”, Nature Physics 9, 29 (2013). [3] T. H. Taminiau, J. Cramer, T. van der Sar, V. V. Dobrovitski, R. Hanson, “Universal control and error correction in multi-qubit spin registers in diamond”, arXiv:1309.5452 (2013).
[4]. E. George, L. Robledo, O. Maroney, M. Blok, H. Bernien, M. L. Markham, D. J. Twitchen, J. J. L. Morton, G. A. D. Briggs, R. Hanson, “Opening up three quantum boxes causes classically undetectable wavefunction collapse”, Proceedings of the
National Academy of Sciences 110, 3777 (2013).
[5] M.S. Blok, C. Bonato, M.L. Markham, D.J. Twitchen, V.V. Dobrovitski, R. Hanson, “Manipulating a qubit through the backaction of sequential partial measurements and real-time feedback”, arXiv:1311.2899 (2013).
