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Displaying 601 - 625 of 871

Dynamical Autler-Townes control of a phase qubit

September 10, 2012
Author(s)
Jian Li, G.S. Paraoanu, Katarina Cicak, Fabio Altomare, Jae Park, Raymond Simmonds, Mika A. Sillanpaa, Pertti Hakonen
We present an experimental demonstration of a phase qubit acting as an on/o® switch for the absorbtion of photons in a probe microwave beam. The switch is controlled by a second control microwave ¯eld. The on/o® states of the qubit are steady states which

Dual-channel, single-photon upconversion detector at 1.3 mm

August 3, 2012
Author(s)
Jason S. Pelc, Paulina Kuo, Oliver T. Slattery, Lijun Ma, Xiao Tang, Martin M. Fejer
We demonstrate efficient, single-photon upconversion detection of two wavelengths in the 1300-nm band. The upconversion detector is based on a phase-modulated, periodically poled LiNbO3 waveguide that simultaneously quasi-phasematches two sum-frequency

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

August 3, 2012
Author(s)
Paulina Kuo, Jason S. Pelc, Oliver T. Slattery, Lijun Ma, Martin M. Fejer, Xiao Tang
We show a dual-channel, upconversion detector at 1.3-m-wavelength based on phasemodulated periodically poled LiNbO3, and use it for wavelength- to time-division multiplexing to achieve high data rates, useful for quantum key distribution.

On-chip, photon-number-resolving, telecom-band detectors for scalable photonic information processing

July 30, 2012
Author(s)
Thomas Gerrits, Nick Thomas-Peter, James Gates, Adriana E. Lita, Benjamin Metcalf, Brice R. Calkins, Nathan A. Tomlin, Anna E. Fox, Antia A. Lamas-Linares, Justin Spring, Nathan Langford, Richard P. Mirin, Peter Smith, Ian Walmsley, Sae Woo Nam
We demonstrate the operation of an integrated photon number resolving transition edge sensor (TES), operating in the telecom band at 1550 nm, employing an evanescently coupled design that allows the detector to be placed at arbitrary locations within a

Transition edge sensors with low jitter and fast recovery times

July 30, 2012
Author(s)
Antia A. Lamas-Linares, Nathan A. Tomlin, Brice R. Calkins, Adriana E. Lita, Thomas Gerrits, Joern Beyer, Richard P. Mirin, Sae Woo Nam
Superconducting transition edge sensors (TES) for single photon detection have been shown to have almost perfect quantum efficiency (98%) at a wide range of wavelengths. Their high quantum efficiency combined with their ability to intrisically measure the

Improving Quantum Clocks via Semidefinite Programming

July 26, 2012
Author(s)
Michael J. Mullan, Emanuel H. Knill
The accuracies of modern quantum logic clocks have surpassed those of standard atomic fountain clocks. These clocks also provide a greater degree of control, as before and after clock queries, we are able to apply chosen unitary operations and measurements

Continuous-variable quantum compressed sensing

July 9, 2012
Author(s)
Yi-Kai Liu, Matthias Ohliger, Vincent Nesme, David Gross, Jens Eisert
We introduce a novel method to faithfully reconstruct unknown quantum states that are approximately low-rank, using only a few measurement settings. The method is general enough to allow for measurements from a continuous family, and is also applicable to

A Digital-to-Analog Converter with a Voltage Standard Reference

July 1, 2012
Author(s)
Alain Rufenacht, Charles J. Burroughs, Samuel Benz, Paul Dresselhaus
Commercially available 20-bit digital to analog converters (DACs) have the potential to impact the field of low frequency voltage metrology. We measured a linearity of ±6 µV (±0.6 µV/V full scale) over the 10 V range for such a DAC with a Zener voltage

Flat frequency response in the electronic measurement of the Boltzmann constant

July 1, 2012
Author(s)
Jifeng Qu, Samuel Benz, Yang Fu, Jianqiang Zhang, Horst Rogalla, Alessio Pollarolo
A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with integration period of

Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards

July 1, 2012
Author(s)
Charles J. Burroughs, Alain Rufenacht, Samuel P. Benz, Paul D. Dresselhaus
The amplitudes of stepwise-approximated sine waves produced by programmable Josephson voltage standards (PJVSs) are not intrinsically accurate because the transitions between the quantized voltages depend on numerous conditions. We have developed a method

Ancilla assisted calibration of a measuring apparatus

June 19, 2012
Author(s)
Alan L. Migdall, Giorgio Brida, L. Ciavarella, Ivo P. Degiovanni, Marco Genovese, M. G. Mingolla, M. G. A. Paris, Fabrizio Piacentini, Sergey Polyakov
The rapid development of quantum systems has enabled a wide range of novel and innovative technologies, from quantum information processing to quantum etrology and imaging [113], mainly based on optical systems. Precise characterization techniques of

Effect of Losses on the Performance of an SU(1,1) Interferometer

June 4, 2012
Author(s)
Alberto M. Marino, Neil V. Corzo Trejo, Paul D. Lett
We study the effect of losses on the phase sensitivity of the SU(1,1) interferometer for different configurations. We find that this type of interferometer is robust against losses that result from an inefficient detection system. This type of loss only

Quantum Algorithms for Quantum Field Theories

June 1, 2012
Author(s)
Stephen P. Jordan, Keith S. Lee, John Preskill
Quantum field theory reconciles quantum mechanics and special relativity, and plays a central role in many areas of physics. We develop a quantum algorithm to compute relativistic scattering probabilities in a massive quantum field theory with quartic self

The Peierls Substitution in an Engineered Lattice Potential

May 29, 2012
Author(s)
Karina K. Jimenez Garcia, Lindsay J. LeBlanc, Ross A. Williams, Matthew C. Beeler, Abigail R. Perry, Ian B. Spielman
Artificial gauge fields open new possibilities to realize quantum many-body systems with ultracold atoms, by constructing Hamiltonians usually associated with electronic systems. In the presence of a periodic potential, artificial gauge fields may bring

LDPC for QKD Reconcilation

May 22, 2012
Author(s)
Alan Mink, Anastase Nakassis
We present the Low Density Parity Check (LDPC) forward error correction algorithm adapted for the Quantum Key Distribution (QKD) protocol in a form readily applied by developers. A sparse parity check matrix is required for the LDPC algorithm and we

Extending single-photon optimized superconducting transition edge sensors beyond the single-photon counting regime

May 6, 2012
Author(s)
Thomas Gerrits, Brice R. Calkins, Nathan A. Tomlin, Adriana E. Lita, Alan L. Migdall, Richard P. Mirin, Sae Woo Nam
We illuminate a photon-number-resolving transition edge sensor with strong pulses of light containing up to 6.7 million photons (0.85 pJ per pulse). These bright pulses heat the sensor far beyond its transition edge into the normal resistance regime. We

On-chip, photon-number-resolving, telecom-band detectors for scalable photonic information processing

May 6, 2012
Author(s)
Thomas Gerrits, Nick Thomas-Peter, James Gates, Adriana E. Lita, Benjamin Metcalf, Brice R. Calkins, Nathan A. Tomlin, Anna E. Fox, Antia A. Lamas-Linares, Justin Spring, Nathan Langford, Richard P. Mirin, Peter Smith, Ian Walmsley, Sae Woo Nam
We demonstrate an integrated photon-number resolving detector, operating in the telecom band at 1550 nm, employing an evanescently coupled design that allows the detector to be placed at arbitrary locations within a planar optical circuit. Up to 5 photons

Magic-state distillation with the four-qubit code

April 20, 2012
Author(s)
Adam M. Meier, Bryan K. Eastin, Emanuel H. Knill
The distillation of magic states is an often-cited technique for enabling universal quantum computing once the error rate for a special subset of gates has been made negligible by other means. We present a routine for magic-state distillation that reduces

Quantum interference between two single photons of different microwave frequencies

April 20, 2012
Author(s)
Francois E. Nguyen, Eva A. Zakka-Bajjani, Jose A. Aumentado, Raymond W. Simmonds
Quantum interference is an important tool for fields such as lithography, metrology and quantum processing. Two identical optical photons (photons with the same wavelength and polarization) simultaneously sent through the two input ports of a semi
Displaying 601 - 625 of 871