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Physics

Quantum information science

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Displaying 551 - 575 of 924

Direct generation of three-photon polarization entanglement

April 28, 2014
Author(s)
Deny Hamel, Krister Shalm, Hannes Hubel, Aaron J. Miller, Francesco F. Marsili, Varun Verma, Richard Mirin, Sae Woo Nam, Kevin Resch, Thomas Jennewein
Non-classical states of light are of fundamental importance for emerging quantum technologies. All optics experiments producing multi-qubit entangled states have until now relied on outcome post-selection, a procedure where only the measurement results

Quantum Algorithms for Fermionic Quantum Field Theories

April 28, 2014
Author(s)
Stephen P. Jordan, Keith S. Lee, John Preskill
Extending previous work on scalar field theories, we develop a quantum algorithm to compute relativistic scattering amplitudes in fermionic field theories, exemplified by the massive Gross-Neveu model. The algorithm introduces new techniques to meet the

Time-resolved double-slit interference pattern measurement with entangled photons

April 28, 2014
Author(s)
Lynden K. Shalm, Thomas Jennewein, Kevin Resch, Piotr Kolenderski, Carmelo Scarcella, Kelsey D. Johnsen Johnsen, Deny Hamel, Cahterine Holloway, Simone Tisa, Alberto Tosi
The double-slit experiment strikingly demonstrates the wave-particle duality of quantum objects. In this famous experiment, particles pass one-by-one through a pair of slits and are detected on a distant screen. A distinct wave-like pattern emerges after

Multiple-time-scale blinking in InAs quantum dot single photon sources

April 16, 2014
Author(s)
Marcelo I. Davanco, C S. Hellberg, Serkan Ates, Antonio Badolato, Kartik A. Srinivasan
We use photon correlation measurements to study blinking in single, epitaxially-grown selfassembled InAs quantum dots situated in circular Bragg grating and microdisk cavities. The normalized second-order correlation function g(2)( t) is studied across

Tunable Resonant and Nonresonant Interactions between a Phase Qubit and LC Resonator

March 26, 2014
Author(s)
Michael S. Allman, Jed D. Whittaker, Manuel C. Castellanos Beltran, Katarina Cicak, Fabio C. Da Silva, Michael DeFeo, Florent Q. Lecocq, Adam J. Sirois, John D. Teufel, Jose A. Aumentado, Raymond W. Simmonds
We use a flux-biased radio frequency superconducting quantum interference device (rf SQUID) with an embedded flux-biased direct current SQUID to generate strong resonant and nonresonant tunable interactions between a phase qubit and a lumped-element

Optical detection of radio waves through a nanomechanical transducer

March 5, 2014
Author(s)
Jacob M. Taylor, Tolga Bagci, A Simonsen, Silvan Schmid, L Villanueva, Emil Zeuthen, Anders Sorensen, Koji Usami, A Schliesser, E.S. Polzik
Low-loss transmission and sensitive recovery of weak radio-frequency (rf) and mi- crowave signals is an ubiquitous technological challenge, crucial in fields as diverse as radio astronomy, medical imaging, navigation and communication, including those of

Graphene-on-dielectric micromembrane for optoelectromechanical hybrid devices

February 7, 2014
Author(s)
Jacob M. Taylor, Silvan Schmid, Tolga Bagci, Emil Zeuthen, Patrick Herring, Maja Cassidy, C. M. Marcus, Bartolo Amato, Anja Boisen, Yong C. Shin, Jing Kong, Anders Sorensen, Koji Usami, E.S. Polzik
Due to their exceptional mechanical and optical properties, dielectric silicon nitride (SiN) mi- cromembranes have become the centerpiece of many optomechanical experiments. Efficient capac- itive coupling of the membrane to an electrical system would

Third-order antibunching from an imperfect single-photon source

February 4, 2014
Author(s)
Martin J. Stevens, Scott C. Glancy, Sae Woo Nam, Richard P. Mirin
We measure second- and third-order temporal coherences, g (2)(τ) and g (3)(τ1, τ2), of an optically excited single-photon source: an InGaAs quantum dot in a microcavity pedestal. Increasing the optical excitation power leads to an increase in the measured

Third-order antibunching from an imperfect single-photon source

February 4, 2014
Author(s)
Martin J. Stevens, Scott C. Glancy, Sae Woo Nam, Richard P. Mirin
We measure second- and third-order temporal coherences, g(2)(τ) and g(3)(τ1,τ2), of an optically excited single-photon source: an InGaAs quantum dot in a microcavity pedestal. Increasing the optical excitation power leads to an increase in the measured

Quantum teleportation from a telecom-wavelength photon to a solid-state quantum memory

January 28, 2014
Author(s)
Felix Bussieres, Christoph Clausen, Alexey Tiranov, Boris Korzh, Varun Verma, Sae Woo Nam, Francesco Marsili, Alban Ferrier, Harald Hermann, Christine Silberhorn, Wolfgang Sohler, Mikael Afzelius, Nicolas Gisin
In quantum teleportation [1], the state of a single quantum system is disembodied into classical information and purely quantum correlations, to be later reconstructed onto a second system that has never directly interacted with the first one. This

Building one-time memories from isolated qubits

January 14, 2014
Author(s)
Yi-Kai Liu
One-time memories (OTM's) are a simple type of tamper-resistant cryptographic hardware, that can be used to implement many forms of secure computation, such as one-time programs. Here we investigate the possibility of building OTM's using "isolated qubits"

Epitaxial Si encapsulation of highly misfitting SiC quantum dot arrays formed on Si (001)

January 8, 2014
Author(s)
Christopher W. Petz, Dongyue Yang, Alline Myers, Jeremey Levy, Jerrold Floro
This work examines Si overgrowth to encapsulate 3C-SiC quantum dot arrays epitaxially grown on Si substrates. Using transmission electron microscopy we show how the crystalline quality of the Si cap depends on the growth conditions. Overgrowth at 300ºC

Semiconductor-based detectors

December 13, 2013
Author(s)
Sergio Cova, Massimo Ghioni, Mark A. Itzler, Joshua Bienfang, Alessandro Restelli
There is nowadays a widespread and growing interest in low-level light detection and imaging. This interest is driven by the need for high sensitivity in various scientific and industrial applications such as fluorescence spectroscopy in life and material

Hybrid Detectors

November 29, 2013
Author(s)
Sergey V. Polyakov, Alan L. Migdall, Franco N. Wong, Ivo P. Degiovanni, Ian Walmsley, Hendrik B. Coldenstrodt-Ronge
We present an overview of e orts to improve photon-counting detection systems through the use of hybrid detection techniques such as spatial- and time-multiplexing of conventional detectors, and frequency up-conversion. We review the basic operation for

Photomultiplier tubes

November 29, 2013
Author(s)
Sergey V. Polyakov
Photomultiplier tubes (PMTs), also known as photomultipliers, are remarkable devices. While a PMT was the rst device to detect light at the single photon level, invented more than 80 years ago, they are widely used to this day, particularly in biological

Photon statistics, measurements, and measurements tools

November 29, 2013
Author(s)
Martin J. Stevens
Single-photon generation and detection is at the forefront of modern optical physics research. This book is intended to provide a comprehensive overview of the current status of single- photon techniques and research methods in the spectral region from the

Single-Photon Sources and Detectors Book: Chapter 1: Introduction

November 29, 2013
Author(s)
Joshua C. Bienfang, Jingyun Fan, Alan L. Migdall, Sergey V. Polyakov
In the beginning there was light. And it was good. Not long thereafter people began to look for a comprehensive understanding of its nature. While the publication record starts o a little spotty, in the fth century BC the Greek philosopher Empedocles

Efficient quantification of experimental evidence against local realism

November 18, 2013
Author(s)
Yanbao Zhang, Scott C. Glancy, Emanuel H. Knill
To statistically quantify the evidence against local realism in an experiment, it is desirable to bound the probability according to local realism of a violation at least as high as that observed. We describe an efficient protocol for computing such a

High resolution gamma-ray spectroscopy with a microwave-multiplexed TES array

November 11, 2013
Author(s)
Omid Noroozian, John A. Mates, Douglas A. Bennett, Justus A. Brevik, Joseph W. Fowler, Jiansong Gao, Robert D. Horansky, Kent D. Irwin, Daniel R. Schmidt, Joel N. Ullom, Zhao Kang
We demonstrate the first gamma-ray spectroscopy with a microwave-multiplexed two-pixel TES(transition-edge sensor) array. We measured a $^{153}$Gd photon source and achieved an energy resolution of 63 eV full-width-at-half-maximum (FWHM) at 97 keV and an

Imaging topological edge states in silicon photonics

October 20, 2013
Author(s)
Mohammad Hafezi, Jingyun Fan, Alan L. Migdall, Jacob M. Taylor
Systems with topological oder exhibit exotic phenomena including fractional statistics. While most systems with topological order have been electronic, advances in our understanding of synthetic gauge fields have enabled realization of topological order in
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