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Displaying 601 - 625 of 904

Reducing noise in single-photon frequency conversion

April 10, 2013
Author(s)
Paulina S. Kuo, Jason S. Pelc, Oliver T. Slattery, Yong-Su Kim, Martin M. Fejer, Xiao Tang
We demonstrate low-noise and efficient frequency conversion using sum-frequency mixing in a periodically poled LiNbO3 (PPLN) waveguide. Using a 1556 nm pump, 1302 nm photons are efficiently converted to 709 nm photons. We obtain 70% conversion efficiency

Arbitrary waveform generator for quantum information processing with trapped ions

March 20, 2013
Author(s)
Ryan S. Bowler, Ulrich J. Warring, Joseph W. Britton, J. M. Amini
Ions confined in a multi-electrode trap design have been proposed as a possible basis for quantum information processing. This scheme involves transporting ions between spatially distinct locations using time varying electric potentials combined with laser

Highly efficient heralding of entangled single photons

March 11, 2013
Author(s)
Sven Ramelow, Alexandra Mech, Marissa Giustina, Simon Groeblacher, Witlef Wieczorek, Adriana Lita, Brice R. Calkins, Thomas Gerrits, Sae Woo Nam, Anton Zeilinger, Rupert Ursin
Single photons are an important prerequisite for a broad spectrum of quantum optical applications. We experimentally demonstrate a heralded single-photon source based on spontaneous parametric down- conversion in collinear bulk optics, and fiber-coupled

Effect of atomic coherence on "temporal cloaking" in atomic vapors

February 27, 2013
Author(s)
Runbing Li, Lu Deng, Edward W. Hagley, Joshua C. Bienfang, M G. Payne, Mo-Lin Ge
We discuss a different scheme to achieve temporal cloaking in warm atomic vapors. Instead of creating a temporal-spatial window in a patched broadband short optical pulse using static differential dispersion of an optical fiber, we create a temporal

Detecting Single Infrared Photons with 93 % System Efficiency

February 25, 2013
Author(s)
Francesco F. Marsili, Varun B. Verma, Jeffrey A. Stern, Sean D. Harrington, Adriana E. Lita, Thomas Gerrits, Igor Vayshenker, Burm Baek, Matthew D. Shaw, Richard P. Mirin, Sae Woo Nam
Single-photon detectors (SPDs) are nonlinear transducers that respond to the absorption of one or more photons with an electrical signal1. SPDs at near infrared wavelengths with high system detection efficiency (> 90%), low dark count rate (

Radiation-suppressed superconducting quantum bit in a planar geometry

February 19, 2013
Author(s)
Martin O. Sandberg, Tomas A. Ohki, Jose A. Aumentado, Martin P. Weides, David P. Pappas
We present a superconducting transmon qubit circuit design based on large, coplanar capacitor plates and a microstrip resonator. The microstrip geometry, with the ground plane on the back, enhances access to the circuit for state preparation and

Experimental test of an event-based corpuscular model modification as an alternative to quantum mechanics

February 13, 2013
Author(s)
Giorgio Brida, Ivo P. Degiovanni, Marco Genovese, Alan L. Migdall, Fabrizio Piacentini, Sergey Polyakov, Paola Traina
We present the first experimental test that distinguishes between an Event-Based Corpuscular Model (EBCM)9) of the interaction of photons with matter and quantum mechanics. The test looks at the interference that results as a single photon passes through a

Nonlinear Optics Quantum Computing with Circuit QED

February 5, 2013
Author(s)
Prabin Adhikari, Mohammad Hafezi, Jacob Taylor
One approach to quantum information processing is to use photons as quantum bits and rely on linear optical elements for most operations. However, some optical nonlinearity is necessary to enable universal quantum computing. Here, we suggest a circuit-QED

Joint Spectral Measurements at the Hong-Ou-Mandel Interference Dip

January 29, 2013
Author(s)
Thomas Gerrits, Francesco F. Marsili, Varun B. Verma, Adriana E. Lita, Antia A. Lamas-Linares, Jeffrey A. Stern, Matthew Shaw, William Farr, Richard P. Mirin, Sae Woo Nam
We employed a 2 channel single-photon detection system with high detection efficiency and low jitter to characterize the joint spectral distribution (JSD) of the correlated photons emerging from a Hong-Ou-Mandel interference arrangement. We show the JSDs

Experimental demonstration of a receiver beating the standard quantum limit for multiple nonorthogonal coherent-state discrimination

January 6, 2013
Author(s)
Francisco E. Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Julius Goldhar, Jonathan Kosloski, Alan L. Migdall
The measurement of the state of a quantum system with inherent quantum uncertainty (noise) approaching the ultimate physical limits is of both technological and fundamental interest. Quantum noise prevents any mutually nonorthogonal quantum states, such as

The equilibrium states of open quantum systems in the strong coupling regime

December 26, 2012
Author(s)
Jacob M. Taylor, Yigit Subasi, Chris Fleming, Bei L. Hu
In this work we investigate the late-time stationary states of open quantum systems coupled to a thermal reservoir in the strong coupling regime. This is because in general such systems do not necessarily relax to a Boltzmann distribution if the coupling

Adaptive measurements in nonorthogonal state discrimination

December 18, 2012
Author(s)
Francisco E. Becerra Chavez, Alan L. Migdall
Adaptive measurements represent important resources in quantum information science and quan- tum technologies. They take advantage of the knowledge of partial measurements of the system to optimize subsequent measurements and perform tasks that are dicult

Dynamics of a pulsed single photon source

December 18, 2012
Author(s)
Sergey V. Polyakov, Edward B. Flagg, Tim O. Thomay, Glenn S. Solomon
We propose and demonstrate a method for an independent verification of a degree of single photon purity and coherence applicable for all single-photon emitters used in pulsed mode. Using two-time second-order correlation measurements, we reconstruct the

Dual-channel, single-photon upconversion detector near 1300 nm

November 5, 2012
Author(s)
Paulina S. Kuo, Jason S. Pelc, Oliver T. Slattery, Martin M. Fejer, Xiao Tang
Upconversion of 1.3-micron photons and detection using silicon avalanche photodiodes (Si APDs) can produce high photon detection efficiencies (PDEs) with low dark count rates. We demonstrate a novel two-channel device based on a phase-modulated

Slot-mode-coupled optomechanical crystals

October 22, 2012
Author(s)
Marcelo I. Davanco, Jasper Chan, Amir H. Safavi-Naeini, Oskar Painter, Kartik A. Srinivasan
We design a cavity optomechanical system in which a localized GHz frequency mechanical mode of a nanobeam resonator is evanescently coupled to a high quality factor (Q > 10^6) optical mode of a separate nanobeam optical cavity. Using separate nanobeams

Dynamics of the non-classical light from a single solid-state quantum emitter

October 18, 2012
Author(s)
Edward B. Flagg, Sergey Polyakov, Tim O. Thomay, Glenn S. Solomon
We measure the dynamics of a non-classical optical field using two-time second-order correlations in conjunction with pulsed excitation. The technique quantifies single-photon purity and coherence during the excitation-relaxation cycle of an emitter, which

Circuit Quantum Electrodynamics with a Spin-Orbit Qubit

October 17, 2012
Author(s)
Jacob M. Taylor, Karl Petersson, L. McFaul, M. Schroer, M. Jung, Andrew Houck, Jason Petta
We develop a circuit quantum electrodynamics architecture for spin qubits by coupling an InAs double quantum dot to a high quality factor superconducting cavity. A charge trapped in the double quantum dot interacts with the electric field of the cavity
Displaying 601 - 625 of 904
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