QUIE2T Quantum Information Entanglement-Enabled Technologies

Bing Huang, Hongjun Xiang, Jaejun Yu, and Su-Huai Wei
Developing approaches to effectively control the charge and magnetic states is critical to the use of magnetic nanostructures in quantum information devices but is still challenging. Here we suggest that the magnetic and charge states of transition-metal (TM) doped single-layer boron-nitride (SLBN) ... [Phys. Rev. Lett. 108, 206802 ] published .

Oleg O. Brovko and Valeri S. Stepanyuk
In a recent paper, Moon et al. [Nat. Nanotechnol. 4, 167 (2009)] have shown that the single-atom limit for information storage density can be overcome by using the coherence of electrons in a two-dimensional electron gas to produce quantum holograms comprised of individually manipulated molecules pr ... [Appl. Phys. Lett. 100, 163112 (2012)] published Wed Apr 18, 2012.

K. Geerlings, S. Shankar, E. Edwards, L. Frunzio, R. J. Schoelkopf et al.
Applications in quantum information processing and photon detectors are stimulating a race to produce the highest possible quality factor on-chip superconducting microwave resonators. We have tested the surface-dominated loss hypothesis by systematically studying the role of geometrical parameters o ... [Appl. Phys. Lett. 100, 192601 (2012)] published Mon May 7, 2012.

Joel Greenberg and Daniel Gauthier
We observe a nonlinear optical process in a gas of cold atoms that simultaneously displays the largest reported fifth-order nonlinear susceptibility =1.910(m/V) and high transparency. The nonlinearity results from the simultaneous cooling and crystallization of the gas, and gives rise to efficient B ... [EPL 98, 24001 (2012)] published Wed May 2, 2012.

Utsab Khadka, Jiteng Sheng, Xihua Yang, and Min Xiao
In this paper, we demonstrate a scheme capable of two-phase measurement, i.e. the simultaneous measurement of two phase shifts occurring in two independent MachZehnder interferometers using one intensity detector. Our scheme utilizes dark-state-enhanced coupled parametric amplifiers in an atomic med ... [New J. Phys. 14, 043026 (2012)] published Wed May 2, 2012.

Luca Chirolli, Davide Venturelli, Fabio Taddei, Rosario Fazio, and Vittorio Giovannetti
We propose a resonant spin-field-effect transistor for chiral spin-resolved edge states in the integer quantum Hall effect with Rashba spin-orbit interaction. It employs a periodic array of voltage-controlled top gates that locally modulate the Rashba spin-orbit interaction. Strong resonant spin-fie ... [Phys. Rev. B 85, 155317 ] published .

Mustafa Gundogan, Patrick M. Ledingham, Attaallah Almasi, Matteo Cristiani, and Hugues de Riedmatten
We report on the quantum storage and retrieval of photonic polarization quantum bits onto and out of a solid state storage device. The qubits are implemented with weak coherent states at the single photon level, and are stored for a predetermined time of 500 ns in a praseodymium doped crystal with a ... [Phys. Rev. Lett. 108, 190504 ] published .

Christoph Clausen, Felix Bussieres, Mikael Afzelius, and Nicolas Gisin
Storage of quantum information encoded into heralded single photons is an essential constituent of long-distance quantum communication based on quantum repeaters and of optical quantum information processing. The storage of photonic polarization qubits is, however, difficult because many materials a ... [Phys. Rev. Lett. 108, 190503 ] published .

Bo Sun, Colin Ming Earn Chow, Duncan G. Steel, Allan S. Bracker, Daniel Gammon et al.
We demonstrate the suppression of nuclear-spin fluctuations in an InAs quantum dot and measure the timescales of the spin narrowing effect. By initializing for tens of milliseconds with two continuous wave diode lasers, fluctuations of the nuclear spins are suppressed via the hole-assisted dynamic n ... [Phys. Rev. Lett. 108, 187401 ] published .

C. D. Weis, C. C. Lo, V. Lang, A. M. Tyryshkin, R. E. George et al.
We have performed continuous wave and pulsed electron spin resonance measurements of implanted bismuth donors in isotopically enriched silicon-28. Donors are electrically activated via thermal annealing with minimal diffusion. Damage from bismuth ion implantation is repaired during thermal annealing ... [Appl. Phys. Lett. 100, 172104 (2012)] published Tue Apr 24, 2012.

Xiaopeng Wang, Mingwen Zhao, Zhenhai Wang, Xiujie He, Yan Xi et al.
VO center in cubic gallium nitride is a defect complex composing of a substitutional oxygen atom at nitrogen site (O) and an adjacent gallium vacancy (V). Based on first-principles calculations, we predicted that this VO center has much in common with the famous nitrogen-vacancy center in diamond, b ... [Appl. Phys. Lett. 100, 192401 (2012)] published Mon May 7, 2012.

Kosuke Horibe, Tetsuo Kodera, Tomohiro Kambara, Ken Uchida, and Shunri Oda
Single-electron transistors (SETs) are efficient charge sensors for reading out spin or charge qubits confined in quantum dots (QDs). To investigate their capacitive parameters, which are related to the signal-to-noise ratio (SNR) during qubit readout, twin silicon single QDs were fabricated using a ... [J. Appl. Phys. 111, 093715 (2012)] published Mon May 7, 2012.

Kazuki Koshino and Yasunobu Nakamura
We investigate the dynamics of a superconducting qubit strongly coupled to a semi-infinite one-dimensional microwave field having a variable boundary condition. The radiative level shift and linewidth of the qubit are controllable through the boundary condition of the field, and the spectral propert ... [New J. Phys. 14, 043005 (2012)] published Wed May 2, 2012.

Dong-Sheng Ding, Zhi-Yuan Zhou, Bao-Sen Shi, Xu-Bo Zou, and Guang-Can Guo
The efficient wavelength conversion of images has many potential applications in optical communication, sensing, imaging, and quantum information fields. In this work, we report on a demonstration of an image transfer between light of wavelength 780 nm and light of wavelength 1530 nm by performing t ... [Phys. Rev. A 85, 053815 ] published .

K. Sandner, H. Ritsch, R. Amsuss, Ch. Koller, T. Nobauer et al.
We study experimentally and theoretically a dense ensemble of negatively charged nitrogen-vacancy centers in diamond coupled to a high-Q superconducting coplanar waveguide cavity mode at low temperature. The nitrogen-vacancy centers are modeled as effective spin-one defects with inhomogeneous freque ... [Phys. Rev. A 85, 053806 ] published .

T. V. Gevorgyan, A. R. Shahinyan, and G. Yu. Kryuchkyan
We demonstrate a quantum regime of dissipative nonlinear oscillators where the creation of Fock states as well as the superpositions of Fock states are realized for time intervals exceeding the characteristic decoherence time. The preparation of quantum states is conditioned by strong Kerr nonlinear ... [Phys. Rev. A 85, 053802 ] published .

Ting Chen and Ren-Bao Liu
In quantum communication and distributed quantum computing, one-dimensional (1D) waveguides provide directional transfer of quantum information. A single-mode waveguide has a density-of-states singularity at the lower cut-off frequency, which resembles sharp resonances of a cavity but with non-Marko ... [Phys. Rev. A 85, 043830 ] published .

Y. Lyanda-Geller, T. L. Reinecke, and G. Bacher
We develop an approach for tuning the spin splitting and g-factor of a quantum dot by coupling it to semi-magnetic quantum dot and tuning the electric field. We show that spin splittings and g-factors of the states of a non-magnetic quantum dot coupled to semimagnetic quantum dot can be enhanced ord ... [J. Appl. Phys. 111, 093705 (2012)] published Thu May 3, 2012.

S. Gustavsson, J. Bylander, F. Yan, P. Forn-Diaz, V. Bolkhovsky et al.
We have investigated the driven dynamics of a superconducting flux qubit that is tunably coupled to a microwave resonator. We find that the qubit experiences an oscillating field mediated by off-resonant driving of the resonator, leading to strong modifications of the qubit Rabi frequency. This open ... [Phys. Rev. Lett. 108, 170503 ] published .

Wei-Tao Liu, Ting Zhang, Ji-Ying Liu, Ping-Xing Chen, and Jian-Min Yuan
A fundamental difficulty in demonstrating quantum state tomography is that the required resources grow exponentially with the system size. For pure states and nearly pure states, the task of tomography can be more efficient. We proposed two methods for state reconstruction, by (1) minimizing entropy ... [Phys. Rev. Lett. 108, 170403 ] published .