SOLID

Enhanced photoluminescence from self-organized rubrene single crystal surface structures

Date: 
2010-06-07
Author(s): 

R. J. Stöhr, G. J. Beirne, P. Michler, R. Scholz, J. Wrachtrup, and J. Pflaum

Reference: 

Appl. Phys. Lett. 96, 231902 (2010)

We report on crystalline pyramidal structures grown via self-organization on the rubrene (001) surface. The analysis of their spectral response by means of photoluminescence with micrometer lateral resolution reveals an intensity enhancement on-top of the surface structures. As we demonstrate this intensity increase can be related to the excitation processes at the molecular level in combination with exciton confinement within the pyramids.

Creation efficiency of nitrogen-vacancy centres in diamond

Date: 
2010-06-28
Author(s): 

S. Pezzagna, B. Naydenov, F. Jelezko, J. Wrachtrup and J. Meijer

Reference: 

New J. Phys. 12, 065017

Nanoscale Engineering and Optical Addressing of Single Spins in Diamond

Date: 
2010-09-03
Author(s): 

Sébastien Pezzagna1,*, Dominik Wildanger2, Paul Mazarov3, Andreas D. Wieck3, Yanko Sarov4, Ivo Rangelow4, Boris Naydenov5, Fedor Jelezko5, Stefan W. Hell2, Jan Meijer1

Reference: 

Small 6, 2117-2121 (19)

The artificial creation of shallow nitrogen-vacancy (NV) centres in diamond with 25 nm lateral resolution is performed by collimated implantation of low-energy nitrogen ions. The electron spin associated to this defect is the most promising qubit for a scalable quantum computer working at room temperature. Individual optical addressing of two single centres separated by only 16 nm is demonstrated with stimulated emission depletion (STED) microscopy.

Fluorescence of laser-created electron-hole plasma in graphene

Date: 
2010-09-14
Author(s): 

Rainer J. Stöhr, Roman Kolesov, Jens Pflaum, and Jörg Wrachtrup

Reference: 

Phys. Rev. B 82, 121408(R) (2010)

Sub-optical resolution of single spins using magnetic resonance imaging at room temperature in diamond

Date: 
2010-03-29
Author(s): 

Chang Shin, Changdong Kim, Roman Kolesov, Gopalakrishnan Balasubramanian, Fedor Jelezko, Jörg Wrachtrup, Philip R. Hemmer

Reference: 

Journal of Luminescence 130- 1635-1645 (9)

There has been much recent interest in extending the technique of magnetic resonance imaging (MRI) down to the level of single spins with sub-optical wavelength resolution. However, the signal to noise ratio for images of individual spins is usually low and this necessitates long acquisition times and low temperatures to achieve high resolution. An exception to this is the nitrogen-vacancy (NV) color center in diamond whose spin state can be detected optically at room temperature.

Strong Coupling of a Spin Ensemble to a Superconducting Resonator

Date: 
2010-09-27
Author(s): 

Y. Kubo, F. R. Ong, P. Bertet, D. Vion, V. Jacques, D. Zheng, A. Dréau, J.-F. Roch, A. Auffeves, F. Jelezko, J. Wrachtrup, M.F. Barthe, P. Bergonzo, D. Esteve

Reference: 

Phys. Rev. Lett. 105, 140502 (2010)

We report the realization of a quantum circuit in which an ensemble of electronic spins is coupled to a frequency tunable superconducting resonator. The spins are Nitrogen-Vacancy centers in a diamond crystal. The achievement of strong coupling is manifested by the appearance of a vacuum Rabi splitting in the transmission spectrum of the resonator when its frequency is tuned through the NV center electron spin resonance.

FET QIFT Open Day & Cluster Review 2011

Summary: 

The registration for the FET QIFT Open Day held on 15th April in Warsaw and Cluster Review, 14th April, is open.

Please register for the event at:

http://qift2011.fuw.edu.pl

Cluster Review will include projects: AQUTE, Q-ESSENCE and SOLID.

Coupling molecular spin states by photon-assisted tunneling

Date: 
2010-10-27
Author(s): 

L. R. Schreiber, F. R. Braakman, T. Meunier, V. Calado, J. Danon, J. M. Taylor, W. Wegscheider, L. M. K. Vandersypen

Reference: 

arXiv:1010.5682v1 [quant-ph]

Artificial molecules containing just one or two electrons provide a powerful platform for studies of orbital and spin quantum dynamics in nanoscale devices. A well-known example of these dynamics is tunneling of electrons between two coupled quantum dots triggered by microwave irradiation. So far, these tunneling processes have been treated as electric dipole-allowed spin-conserving events. Here we report that microwaves can also excite tunneling transitions between states with different spin.

Efficient C-Phase gate for single-spin qubits in quantum dots

Date: 
2010-10-01
Author(s): 

T. Meunier, V. E. Calado, L. M. K. Vandersypen

Reference: 

arXiv:1010.0164v1 [cond-mat.mes-hall]

Two-qubit interactions are at the heart of quantum information processing. For single-spin qubits in semiconductor quantum dots, the exchange gate has always been considered the natural two-qubit gate. The recent integration of magnetic field or g-factor gradients in coupled quantum dot systems allows for a one-step, robust realization of the controlled phase (C-Phase) gate instead.

Electron Shot Noise and Nuclear Spin Dynamics in Spin-Blockaded Quantum Dots

Date: 
2010-01-11
Author(s): 

M. S. Rudner, F. H. L. Koppens, J. A. Folk, L. M. K. Vandersypen, L. S. Levitov

Reference: 

arXiv:1001.1735v1 [cond-mat.mes-hall]

Transport through spin-blockaded quantum dots provides a means for electrical control and detection of nuclear spin dynamics in the host material. Although such experiments have become increasingly popular in recent years, interpretation of their results in terms of the underlying nuclear spin dynamics remains challenging. Here we point out a fundamental process in which nuclear spin dynamics can be driven by electron shot noise; fast electric current fluctuations generate much slower nuclear polarization dynamics, which in turn affect electron dynamics via the Overhauser field.

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