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Displaying 1176 - 1200 of 1694

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
Displaying 1176 - 1200 of 1694
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