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Displaying 51 - 75 of 317

Tunable quantum beat of single photons enabled by nonlinear nanophotonics

November 22, 2019
Author(s)
Qing Li, Anshuman Singh, Xiyuan Lu, John Lawall, Varun Verma, Richard Mirin, Sae Woo Nam, Kartik Srinivasan
Integrated photonics is a promising approach for scalable implementation of diverse quantum resources at the chip-scale. Here, we demonstrate the integration of two essential building blocks for quantum information science - quantum sources and frequency

A kilopixel array of superconducting nanowire single-photon detectors

November 18, 2019
Author(s)
Varun Verma, Adriana Lita, Sae Woo Nam, R P. Mirin, Emma Wollman, William Farr, Matthew Shaw
We present a 1024-element imaging array of superconducting nanowire single photon detectors (SNSPDs) using a 32x32 row-column multiplexing architecture. Large arrays are desirable for applications such as imaging, spectroscopy, or particle detection.

Detecting Sub-GeV Dark Matter with Superconducting Nanowires

October 10, 2019
Author(s)
Varun Verma, Sae Woo Nam, Ilya Charaev, Marco Colangelo, Karl Berggren, Yonit Hochberg
We propose the use of superconducting nanowires as both target and sensor for direct detection of light dark matter. With excellent sensitivity to low-energy deposits on electrons, and demonstrated low dark counts, such devices could be used to probe

State-independent quantum tomography of a single-photon state by photon-number-resolving measurements

October 10, 2019
Author(s)
Thomas Gerrits, Adriana Lita, Sae Woo Nam, Rajveer Nehra, Aye Win, Miller Eaton, Niranjan Sridhar, R. Shahrokhshahi, O Pfister
A narrowband single-photon state was generated by heralding cavity-enhanced spontaneous parametric downconversion in a PPKTP optical parametric oscillator. The Wigner quasiprobability distribution function was reconstructed, in a state-independent manner

Nonlinear Silicon waveguides produce tunable frequency combs spanning 2.0-8.5 ?m

September 25, 2019
Author(s)
Nima Nader, Abijith S. Kowligy, Jeffrey T. Chiles, Eric J. Stanton, Henry R. Timmers, Alexander J. Lind, Kimberly Briggman, Scott Diddams, Flavio Caldas da Cruz, Richard Mirin, Sae Woo Nam, Daniel M. Lesko
We present fully air clad suspended-silicon waveguides for efficient nonlinear interactions limited only by the silicon transparency. Novel fork-shaped couplers provide efficient input (

Multi-functional integrated photonics in the mid-infrared with suspended AlGaAs on silicon

September 18, 2019
Author(s)
Jeff Chiles, Nima Nader, Eric J. Stanton, Daniel Herman, Galan Moody, Biswarup Guha, Kartik Srinivasan, Scott Diddams, Ian Coddington, Nathan R. Newbury, Jeff Shainline, Sae Woo Nam, Richard Mirin, Jiangang Zhu, Juliet Gopinath, Connor Fredrick
The microscale integration of mid- and longwave-infrared photonics could enable the development of fieldable and reliable chemical sensors. The choice of material platform immediately determines the strength and types of optical nonlinearities available

Quantum interference enables constant-time quantum information processing

July 19, 2019
Author(s)
Thomas Gerrits, Sae Woo Nam, Adriana E. Lita, M. Stobinska, A. Buraczewski, M. Moore, W.R. Clements, J.J. Renema, W.S. Kolthammer, A. Eckstein, I.A. Walmsley
It is an open question how fast information processing can be performed and whether quantum effects can speed up the best existing solutions. Signal extraction, analysis, and compression in diagnostics, astronomy, chemistry, and broadcasting build on the

Quantum Frequency Conversion of a Quantum Dot Single-Photon Source on a Nanophotonic Chip

May 20, 2019
Author(s)
Anshuman Singh, Qing Li, Shunfa Liu, Ying Yu, Xiyuan Lu, Christian Schneider, Sven Hofling, John Lawall, Varun Verma, Richard Mirin, Sae Woo Nam, Jin Liu, Kartik Srinivasan
Single self-assembled InAs/GaAs quantum dots are promising bright sources of indistinguishable photons for quantum information science. However, their distribution in emission wavelength, due to inhomogeneous broadening inherent to their growth, has

Towards a source of entangled photon pairs in gallium phosphide

May 9, 2019
Author(s)
Paulina S. Kuo, Peter G. Schunemann, Mackenzie Van Camp, Varun B. Verma, Thomas Gerrits, Sae Woo Nam, Richard P. Mirin
We investigate parametric down-conversion in orientation-patterned GaP. Pumped at 865 nm, the signal and idler are at 1350 nm and 2400 nm, respectively.

Generating polarization-entangled photon pairs in domain-engineered PPLN

May 7, 2019
Author(s)
Paulina S. Kuo, Varun B. Verma, Thomas Gerrits, Sae Woo Nam, Richard P. Mirin
Using a periodically poled LiNbO3 crystal that is domain-engineered for two simultaneous type-II down-conversion processes, we demonstrated polarization-entangled photon-pair generation.

Integrated transition edge sensors on lithium niobate waveguides

May 7, 2019
Author(s)
Thomas Gerrits, Adriana Lita, Richard Mirin, Sae Woo Nam, Jan P. Hoepker, Stephan Krapick, Harald Herrmann, Raimund Ricken, Victor Quiring, Christine Silberhorn, Tim J. Bartley
We show the proof-of-principle detection of light at 1550 nm coupled evanescently from a lithium niobate waveguide to a superconducting transition edge sensor. The coupling efficiency strongly depends on the polarization, the overlap between the evanescent

Indistinguishable single-mode photons from spectrally engineered biphotons

April 15, 2019
Author(s)
Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Changchen Chen, Jane Heyes, Kyung-Han Hong, Jeffrey Shapiro, Franco N. Wong
We use pulsed spontaneous parametric down-conversion in KTiOPO4, with a Gaussian phasematching function and a transform-limited Gaussian pump, to achieve near-unity spectral purity in heralded single photons at telecommunication wavelength. Theory shows

Multi-pulse fitting of transition edge sensor signals from a near-infrared continuous-wave source

December 11, 2018
Author(s)
Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Jianwei Lee, Lijiong Shen, Alessandro Cere, Christian Kurtsiefer
Transition-edge sensors (TESs) are photon-number resolving calorimetric spectrometers with near unit efficiency. Their recovery time, which is on the order of microseconds, limits the number resolving ability and timing accuracy in high photon-flux

Approximating vibronic spectroscopy with imperfect quantum optics

November 23, 2018
Author(s)
W.R. Clements, Jelmer Renema, Andreas Eckstein, Antonio A. Valido, Adriana Lita, Thomas Gerrits, Sae Woo Nam, Steven Kolthammer, Joonsuk Huh
We study the impact of experimental imperfections on a recently proposed protocol for performing quantum simulations of vibronic spectroscopy. Specifically, we propose a method for quantifying the impact of these imperfections, optimizing an experiment to

Design of superconducting optoelectronic networks for neuromorphic computing

November 6, 2018
Author(s)
Sonia Buckley, Adam McCaughan, Jeff Chiles, Richard Mirin, Sae Woo Nam, Jeff Shainline
We have previously proposed a novel hardware platform for neuromorphic computing based on superconducting optoelectronics that presents many of the features necessary for information processing in the brain. Here we discuss the design and training of

On the scalability of parametric down-conversion for generating higher-order Fock states

October 18, 2018
Author(s)
Thomas Gerrits, Adriana Lita, Sae Woo Nam, Johannes Tiedau, Tim J. Bartley, Georg Harder, Christine Silberhorn
Spontaneous parametric down-conversion (SPDC) is the most widely-used method to generate higher-order Fock states (n>2). Yet, a consistent performance analysis from fundamental principles is missing. Here we address this problem by analyzing state fidelity

Circuit designs for superconducting optoelectronic loop neurons

October 12, 2018
Author(s)
Jeffrey M. Shainline, Adam N. McCaughan, Jeffrey T. Chiles, Richard P. Mirin, Sae Woo Nam, Sonia M. Buckley
We present designs of superconducting optoelectronic neurons based on superconducting single- photon detectors, Josephson junctions, semiconductor light sources, and multi-planar dielectric waveguides. The neurons send few-photon signals to synaptic

Randomness Extraction from Bell Violation with Continuous Parametric Down-Conversion

October 9, 2018
Author(s)
Thomas Gerrits, Sae Woo Nam, Adriana Lita, Lijiong Shen, Jianwei Lee, Le Phuc Thinh, Jean-Daniel Bancal, Alessandro Cere
We present a violation of the CHSH inequality without the fair sampling assumption with a continuously pumped photon pairs source combined with two high efficiency superconducting detectors. Due to the continuous nature of the source, the choice of the

Superconducting optoelectronic networks III: synaptic plasticity

July 5, 2018
Author(s)
Jeffrey M. Shainline, Adam N. McCaughan, Sonia M. Buckley, Christine A. Donnelly, Manuel C. Castellanos Beltran, Michael L. Schneider, Richard P. Mirin, Sae Woo Nam
As a means of dynamically reconfiguring the synaptic weight of a superconducting optoelectronic loop neuron, a superconducting flux storage loop is inductively coupled to the synaptic current bias of the neuron. A standard flux memory cell is used to