Virtual Journal of Quantum Information

D. R. Crick, S. Donnellan, S. Ananthamurthy, R. C. Thompson, and D. M. Segal
We report on the design and testing of an array of Penning ion traps made from printed circuit board. The system enables fast shuttling of ions from one trapping zone to another, which could be of use in quantum information processing. We describe simulations carried out to determine the optimal pot ... [Rev. Sci. Instrum. 81, 013111 (2010)] published Fri Jan 29, 2010.

H. Landa, S. Marcovitch, A. Retzker, M. B. Plenio, and B. Reznik
We propose to realize quantized discrete kinks with cold trapped ions. We show that long-lived solitonlike configurations are manifested as deformations of the zigzag structure in the linear Paul trap, and are topologically protected in a circular trap with an odd number of ions. We study the quantu ... [Phys. Rev. Lett. 104, 043004 ] published .

Ranojoy Bose, Jie Gao, James F. McMillan, Alex D. Williams, and Chee Wei Wong
We present evidence of cavity quantum electrodynamics from a sparse density of strongly quantum-confined Pb-chalcogenide nanocrystals (between 1 and 10) approaching single-dot levels on moderately high-Q mesoscopic silicon optical cavities. Operating at important near-infrared (1500-nm) wavelengths, ... [Opt. Express 17, 22474 (2010)] published Wed Feb 10, 2010.

J. R. Petta, H. Lu, and A. C. Gossard
Rapid coherent control of electron spin states is required for implementation of a spin-based quantum processor. We demonstrated coherent control of electronic spin states in a double quantum dot by sweeping an initially prepared spin-singlet state through a singlet-triplet anticrossing in the energ ... [Science 327, 669 (2010)] published Wed Feb 10, 2010.

M. Feng, Y. Y. Xu, F. Zhou, and D. Suter
Abstract not available. [Phys. Rev. A 81, 019902 ] published .

Murray W. McCutcheon, Darrick E. Chang, Yinan Zhang, Mikhail D. Lukin, and Marko Loncar
Much recent effort has focused on coupling individual quantum emitters to optical microcavities in order to produce single photons on demand, enable single-photon optical switching, and implement functional nodes of a quantum network. Techniques to control the bandwidth and frequency of the outgoing ... [Opt. Express 17, 22689 (2010)] published Wed Feb 10, 2010.

J. Cerrillo, A. Retzker, and M. B. Plenio
We present a robust and fast laser cooling scheme suitable for trapped ions, atoms, or cantilevers. Based on quantum interference, generated by a special laser configuration, it is able to rapidly cool the system such that the final phonon occupation vanishes to zeroth order in the Lamb-Dicke parame ... [Phys. Rev. Lett. 104, 043003 ] published .

Mikael Afzelius, Imam Usmani, Atia Amari, Bjorn Lauritzen, Andreas Walther et al.
We present a light-storage experiment in a praseodymium-doped crystal where the light is mapped onto an inhomogeneously broadened optical transition shaped into an atomic frequency comb. After absorption of the light, the optical excitation is converted into a spin-wave excitation by a control pulse ... [Phys. Rev. Lett. 104, 040503 ] published .

Cosmo Lupo, Vittorio Giovannetti, and Stefano Mancini
We introduce a general model describing correlated noise effects in quantum optical communication via attenuating media. The memory effects account for the environment finite relaxation times, which are unavoidable in any realistic model. The use of a proper set of collective field variables allows ... [Phys. Rev. Lett. 104, 030501 ] published .

Feng Chi and Qing-feng Sun
Based on the device in recent experiments [S. M. Frolov et al., Phys. Rev. Lett. 102, 116802 (2009); Nature (London) 458, 868 (2009)], we propose an all-electrical scheme to prepare and readout a single spin state in a quantum dot (QD). We consider that the QD, which is subjected to a spin bias, has ... [Phys. Rev. B 81, 075310 ] published .

J. E. Gough, M. R. James, and H. I. Nurdin
The aim of this article is to extend linear quantum dynamical network theory to include static Bogoliubov components (such as squeezers). Within this integrated quantum network theory, we provide general methods for cascade or series connections, as well as feedback interconnections using linear fra ... [Phys. Rev. A 81, 023804 ] published .

Tomoyuki Morimae
We investigate low-temperature coherence properties of the Z quantum memory which is capable of storing the information of a single logical qubit. We show that the memory has superposition of macroscopically distinct states for some values of a control parameter and at sufficiently low temperature a ... [Phys. Rev. A 81, 022304 ] published .

Metin Sabuncu, Radim Filip, Gerd Leuchs, and Ulrik L. Andersen
Quantum-information protocols are inevitably affected by decoherence which is associated with the leakage of quantum information into an environment. In this article we address the possibility of recovering the quantum information from an environmental measurement. We investigate continuous-variable ... [Phys. Rev. A 81, 012325 ] published .

A. Abdelrahman, P. Hannaford, and K. Alameh
We propose a new method to create an asymmetric two-dimensionalmagnetic lattice which exhibits magnetic band gap structure similar to semiconductor devices. The quantum device is assumed to host bound states of collective excitations formed in a magnetically trapped quantum degenerate gas of ultraco ... [Opt. Express 17, 24358 (2010)] published Wed Feb 10, 2010.

Ferruccio Pisanello, Luigi Martiradonna, Godefroy Lemenager, Piernicola Spinicelli, Angela Fiore et al.
We propose colloidal CdSe/CdS dots in rods as nonclassical sources for quantum information technology. Such nanoemitters show specific properties such as strongly polarized emission of on-demand single photons at room temperature, dipolelike behavior and mono-exponential recombination rates, making ... [Appl. Phys. Lett. 96, 033101 (2010)] published Tue Jan 19, 2010.

John M. Choi, Kevin L. Silverman, Martin J. Stevens, Todd L. Harvey, and Richard P. Mirin
Micropillar devices have shown promise as single photon sources for applications in quantum key distribution as well as single photon metrology and fundamental science. For higher temperature operation (77 K), a high quality factor (Q) cavity and a small modal volume are necessary for enhanced spon ... [J. Vac. Sci. Technol. B 28, 157 (2010)] published Wed Jan 20, 2010.

Toshiaki Obata, Michel Pioro-Ladriere, Yasuhiro Tokura, Yun-Sok Shin, Toshihiro Kubo et al.
We report the coherent manipulation of electron spins in a double quantum dot integrated with a micromagnet. We performed electric dipole spin resonance experiments in the continuous wave (CW) and pump-and-probe modes. We observed two resonant CW peaks and two Rabi oscillations of the quantum dot cu ... [Phys. Rev. B 81, 085317 ] published .

M. Steiner, P. Neumann, J. Beck, F. Jelezko, and J. Wrachtrup
Precise readout of spin states is crucial for any approach toward physical realization of a spin-based quantum computer and for magnetometry with single spins. Here, we report a method to strongly improve the optical readout fidelity of electron spin states associated with single nitrogen-vacancy (N ... [Phys. Rev. B 81, 035205 ] published .

C. M. Wilson, G. Johansson, T. Duty, F. Persson, M. Sandberg et al.
We study relaxation and dephasing in a strongly driven two-level system interacting with its environment. We develop a theory which gives a straightforward physical picture of the complex dynamics of the system in terms of dressed states. In addition to the dressing of the energy diagram, we describ ... [Phys. Rev. B 81, 024520 ] published .

E. Il'ichev, S. N. Shevchenko, S. H. W. van der Ploeg, M. Grajcar, E. A. Temchenko et al.
We study the multiphoton spectroscopy of artificial solid-state four-level quantum system. This system is formed by two coupled superconducting flux qubits. When multiple driving frequency of the applied microwaves matches the energy difference between any two levels, the transition to the upper lev ... [Phys. Rev. B 81, 012506 ] published .