Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 73: Quantencomputer

Q 73.5: Vortrag

Mittwoch, 9. März 2005, 15:00–15:15, HU 2002

Quantum computing with single spins in diamond — •Torsten Gaebel, Iulian Popa, Michael Domhan, Christoffer Wittmann, Fedor Jelezko, and Jörg Wrachtrup — 3. Physikalisches Institut Universität Stuttgart

Long decoherence time and a precise understanding and manipulation of state evolution are some of the most important requirements to be met by a quantum system in order to implement quantum computing algorithms. An efficient system for this purpose is given by single paramagnetic defect centers in diamond. Recently, single spin readout in nitrogen-vacancy (N-V) defects in diamond at low temperature was demonstrated [1]. The coherent evolution of the electron spin of a defect center in diamond was previously reported [2] and a two-qubit conditional quantum gate at ambient conditions was demonstrated [3].

To scale up the number of qubits, two or more N-V centers can be coupled via their magnetic dipolar interaction. Because of the weakness of the magnetic dipoles, the separation distance between two defects should be in the range of a few nanometers. We will show the first data on N-V centers created by specific implantation techniques, allowing for short inter-center distances. Coherent coupling between implanted defects was demonstrated using spin echo modulation techniques.

[1] F. Jelezko, I. Popa, A. Gruber, and J. Wrachtrup, Appl. Phys. Lett. 81, 2160 (2002). [2] F. Jelezko, T. Gaebel, I. Popa, A. Gruber, and J. Wrachtrup, Phys. Rev. Lett. 92, 076401 (2004). [3] F. Jelezko, T. Gaebel, I. Popa, M. Domhan, A. Gruber, and J. Wrachtrup, Phys. Rev. Lett. 93, 130501 (2004).