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Large Stark Tuning of InAs/InP Quantum Dots

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arXiv 2018年

作者： Aghaeimeibodi, Shahriar Lee, Chang-Min Buyukkaya, Mustafa Atabey Richardson, Christopher J.K. Waks, Edo Department of Electrical and Computer Engineering Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD20742 United States Laboratory for Physical Sciences University of Maryland College ParkMD20740 United States Joint Quantum Institute University of Maryland National Institute of Standards and Technology College ParkMD20742 United States

InAs/InP quantum dots are excellent sources of telecom single-photon emission and are among the most promising candidates for scalable quantum photonic circuits. However, geometric differences in each quantum dot leads to slightly different emission wavelengths and hinders the possibility of generating multiple identical quantum emitters on the same chip. Stark tuning is an efficient technique to overcome this issue as it can control the emission energy of individual quantum dots through the quantum-confined Stark effect. Realizing this technique in InAs/InP quantum dots has previously been limited to shifts of less than 0.8 meV due to jumps in the emission energy because of additional charges at high electric field intensities. We demonstrate up to 5.1 meV of Stark tuning in the emission wavelength of InAs/InP quantum dots. To eliminate undesirable jumps to charged state, we use a thin oxide insulator to prevent carrier injection from the contacts, thereby significantly improves the tuning range of the Stark effect. Moreover, the single-photon nature and narrow linewidth of the quantum dot emission is preserved under a wide range of applied electric fields. Using photoluminescence intensity measurements and time-resolved lifetime spectroscopy we confirmed that this Stark tuning range is limited by carrier tunneling at high electric fields. This result is an important step toward integrating multiple identical quantum emitters at telecom wavelengths on-a-chip, which is crucial for realizing complex quantum photonic circuits for quantum information processing. Copyright © 2018, The Authors. All rights reserved.

关键词： Semiconductor quantum dots

One way quantum repeaters with quantum Reed-Solomon codes

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arXiv 2018年

作者： Muralidharan, Sreraman Zou, Chang-Ling Li, Linshu Jiang, Liang Department of Electrical Engineering Yale University New HavenCT06511 United States US Army research laboratory AdelphiMD20783 United States Department of Applied Physics Yale University New HavenCT06511 United States Yale Quantum Institute Yale University New HavenCT06520 United States

We show that quantum Reed-Solomon codes constructed from classical Reed-Solomon codes can approach the capacity on the quantum erasure channel of d-level systems for large dimension d. We study the performance of one-way quantum repeaters with these codes and obtain a significant improvement in key generation rate compared to previously investigated encoding schemes with quantum parity codes and quantum polynomial codes. We also compare the three generation of quantum repeaters using quantum Reed-Solomon codes and identify parameter regimes where each generation performs the best. Copyright © 2018, The Authors. All rights reserved.

关键词： Reed-Solomon codes

Calibration of cryogenic amplification chains using normal-metal-insulator-superconductor junctions

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arXiv 2019年

作者： Hyyppä, E. Jenei, M. Masuda, S. Sevriuk, V. Tan, K.Y. Silveri, M. Goetz, J. Partanen, M. Lake, R.E. Grönberg, L. Möttönen, M. QCD Labs QTF Centre of Excellence Department of Applied Physics Aalto University P.O. Box 13500 AaltoFI-00076 Finland College of Liberal Arts and Sciences Tokyo Medical and Dental University Ichikawa272-0827 Japan Center for Quantum Computation and Communication Technology School of Electrical Engineering Telecommunications University of New South Wales SydneyNSW2052 Australia Research Unit of Nano and Molecular Systems University of Oulu P.O. Box 3000 OuluFI-90014 Finland VTT Technical Research Centre of Finland QFT Center of Excellence P.O. Box 1000 AaltoFI-02044 Finland

Various applications of quantum devices call for an accurate calibration of cryogenic amplification chains. To this end, we present a convenient calibration scheme and use it to accurately measure the total gain and noise temperature of an amplification chain by employing normal-metal-insulator-superconductor (NIS) junctions. Our method is based on the radiation emitted by inelastic electron tunneling across voltage-biased NIS junctions. We derive an analytical equation that relates the generated power to the applied bias voltage which is the only control parameter of the device. After the setup has been characterized using a standard voltage reflection measurement, the total gain and the noise temperature are extracted by fitting the analytical equation to the microwave power measured at the output of the amplification chain. The 1σ uncertainty of the total gain of 51.84 dB appears to be of the order of 0.1 dB. Copyright © 2019, The Authors. All rights reserved.

关键词： Metal insulator boundaries

Sub/supraliminal stimulus with pseudo-“blindsight” under exposure to ELF fields

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Sub/supraliminal stimulus with pseudo-“blindsight” under e...

International Conference on Magnetics (INTERMAG)

作者： H. Nakagawa S. Ueno Department of Electrical and Electronic Engineering Tokyo Denki University Japan Department of Applied Quantum Physics Kyushu University Fukuoka Japan

Objective Up to the present, some new stimulus technologies with retinal controls are needed to facilitate activations of the parietal and temporal regions via the tectal region (superior colliculus and accessory nucl... 详细信息

ISBN: (纸本)9781538610879

关键词： Retina Visualization Ground penetrating radar Geophysical measurement techniques Art physics Optical sensors

Towards practical characterization of quantum systems with quantum Hamiltonian learning

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Towards practical characterization of quantum systems with q...

Frontiers in Optics, FiO 2017

作者： Santagati, R. Wang, J. Paesani, S. Knauer, S. Gentile, A.A. Wiebe, N. Petruzzella, M. O'Brien, J.L. Rarity, J.G. Laing, A. Thompson, M.G. Quantum Engineering Technology Labs H. H. Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol BS8 1FD United Kingdom Quantum Architectures and Computation Group Microsoft Research RedmondWA98052 United States Department of Applied Physics Eindhoven University of Technology P.O. Box 513 EindhovenNL-5600MB Netherlands

Here we show the first experimental implementation of quantum Hamiltonian Learning, where a silicon-on-insulator quantum photonic simulator is used to learn the dynamics of an electron-spin in an NV center in diamond.... 详细信息

ISBN: (纸本)9781943580330

关键词： Magnetic moments

Experimental quantum hamiltonian learning using a silicon photonic chip and a nitrogen-vacancy electron spin in diamond

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Experimental quantum hamiltonian learning using a silicon ph...

European Quantum Electronics Conference, EQEC 2017

作者： Paesani, Stefano Wang, Jianwei Santagati, Raffaele Knauer, Sebastian Gentile, Andreas A. Wiebe, Nathan Petruzzella, Maurangelo Laing, Anthony Rarity, John O'Brien, Jeremy L. Thompson, M.G. Quantum Engineering Technology Labs H. H. Wills Physics Laboratory Departrtment of Electrical and Electronic Engineering University of Bristol BS8 1FD United Kingdom Quantum Architectures and Computation Group Microsoft Research RedmondWA98052 United States Department of Applied Physics Eindhoven University of Technology P.O. Box 513 EindhovenNL-5600MB Netherlands

Microresonator-based high-resolution gas spectroscopy

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arXiv 2017年

作者： Yu, Mengjie Okawachi, Yoshitomo Griffith, Austin G. Lipson, Michal Gaeta, Alexander L. Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027 United States School of Applied and Engineering Physics Cornell University IthacaNY14853 United States Department of Electrical Engineering Columbia University New YorkNY10027 United States

In recent years, microresonator-based optical frequency combs have created up opportunities for developing a spectroscopy laboratory on a chip due to its broadband emission and high comb power. However, with mode spacings typically in the range of 10 - 1000 GHz, the realization of a chip-based high-resolution spectrometer suitable for gas-phase spectroscopy has proven to be difficult. Here, we show mode-hop-free tuning of a microresonator-based frequency comb over 16 GHz by simultaneously tuning both the pump laser and the cavity resonance. We illustrate the power of this scanning technique by demonstrating gas-phase molecular fingerprinting of acetylene with a high-spectral-resolution of Copyright © 2017, The Authors. All rights reserved.

关键词： Spectral resolution

Author Correction: A Monte Carlo feasibility study for neutron based real-time range verification in proton therapy

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Scientific reports 2019年第1期9卷 14773页

作者： Kristian Smeland Ytre-Hauge Kyrre Skjerdal John Mattingly Ilker Meric Department of Physics and Technology University of Bergen P.O. Box 7803 5020 Bergen Norway. kristian.ytre-hauge@uib.no. Department of Computing Mathematics and Physics Western Norway University of Applied Sciences P.O. Box 7030 5020 Bergen Norway. Department of Nuclear Engineering North Carolina State University Raleigh NC 27695-7909 USA. Department of Electrical Engineering Western Norway University of Applied Sciences P.O. Box 7030 5020 Bergen Norway.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Observation of Out-of-Plane Spin Texture in a SrTiO3(111) Two-Dimensional Electron Gas

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Physical Review Letters 2018年第26期120卷 266802-266802页

作者： Pan He S. McKeown Walker Steven S.-L. Zhang F. Y. Bruno M. S. Bahramy Jong Min Lee Rajagopalan Ramaswamy Kaiming Cai Olle Heinonen Giovanni Vignale F. Baumberger Hyunsoo Yang Department of Electrical and Computer Engineering and NUSNNI National University of Singapore 117576 Singapore Singapore Department of Quantum Matter Physics University of Geneva 24 Quai Ernest-Ansermet 1211 Genève 4 Switzerland Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA Quantum-Phase Electronics Center Department of Applied Physics The University of Tokyo Tokyo 113-8656 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Department of Physics and Astronomy University of Missouri Columbia Missouri 65211 USA Swiss Light Source Paul Scherrer Institut CH-5232 Villigen PSI Switzerland

We explore the second order bilinear magnetoelectric resistance (BMER) effect in the d-electron-based two-dimensional electron gas (2DEG) at the SrTiO3(111) surface. We find evidence of a spin-split band structure with the archetypal spin-momentum locking of the Rashba effect for the in-plane component. Under an out-of-plane magnetic field, we find a BMER signal that breaks the sixfold symmetry of the electronic dispersion, which is a fingerprint for the presence of a momentum-dependent out-of-plane spin component. Relativistic electronic structure calculations reproduce this spin texture and indicate that the out-of-plane component is a ubiquitous property of oxide 2DEGs arising from strong crystal field effects. We further show that the BMER response of the SrTiO3(111) 2DEG is tunable and unexpectedly large.

关键词： Magnetotransport Rashba coupling Spin texture Spin-orbit coupling Spintronics Two-dimensional electron gas