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Displaying 326 - 350 of 615

Characterization of high-purity, pulsed squeezed light at telecom wavelengths from pp-KTP for quantum information applications

May 1, 2011
Author(s)
Thomas Gerrits, Burm Baek, Martin J. Stevens, Brice R. Calkins, Adriana E. Lita, Scott C. Glancy, Emanuel H. Knill, Sae Woo Nam, Richard P. Mirin, Robert Hadfield, Ryan Bennink, Warren Grice, Sander N. Dorenbos, Tony Zijlstra, Teun Klapwijk, Val Zwiller
We characterize a pp-KTP crystal designed to produce pure single mode squeezed vacuum at 1570 nm. Measurements show Hong-Ou-Mandel interference with 97% visibility and a circular joint spectral distribution with a Schmidt number of 1.08.

Superconducting nanowire single-photon detectors

May 1, 2011
Author(s)
Karl Berggren, Vikas Anant, Burm Baek, E Dauler, X Hu, Andrew J. Kerman, F Marsili, Richard Mirin, Richard J. Molnar, Sae Woo Nam, F Najafi, Martin Stevens, F Wong, Tian Zhong
Existing Superconducting Nanowire Single-Photon Detector (SNSPD) technology achieves simultaneously high device detection efficiency (as high as 57% at 1550 nm optical wavelength [1]), ultrashort jitter performance (30 ps), and a fast reset time ( 3 ns)

Third-order antibunching from an imperfect single-photon source

May 1, 2011
Author(s)
Martin J. Stevens, Scott C. Glancy, Sae Woo Nam, Richard P. Mirin
We measure second- and third-order coherences of an imperfect single-photon source. The magnitude of third-order antibunching indicates that imperfect second-order antibunching results from background emission with Poissonian photon number statistics.

Compact cryogenic self-aligning fiber-to-detector coupling with losses below one percent

April 25, 2011
Author(s)
Aaron J. Miller, Adriana Lita, Brice R. Calkins, Igor Vayshenker, Stephen Gruber, Sae Woo Nam
We present a compact packaging technique for coupling light from a single-mode telecommunication fiber to cryogenic singlephoton sensitive devices. Our single-photon detectors are superconducting transition-edge sensors (TESs) with a collection area only a

Characterization of high-purity, pulsed squeezed light at telecom wavelengths from pp-KTP for quantum information applications

December 1, 2010
Author(s)
Thomas Gerrits, Burm Baek, Martin J. Stevens, Brice R. Calkins, Adriana E. Lita, Scott C. Glancy, Emanuel H. Knill, Sae Woo Nam, Richard P. Mirin, Robert Hadfield, Ryan Bennink, Warren Grice, Sander N. Dorenbos, Tony Zijlstra, Teun Klapwijk, Val Zwiller
Pure optical squeezing in a single mode is highly desirable for quantum information applications such as continuous variable quantum computing and the generation of optical Schrödinger cat states. To generate optical cat states, photons are subtracted from

Generation of optical coherent-state superpositions by number-resolved photon subtraction from the squeezed vacuum

September 9, 2010
Author(s)
Thomas Gerrits, Scott C. Glancy, Tracy S. Clement, Brice R. Calkins, Adriana E. Lita, Aaron Miller, Aaron J. Miller, Alan L. Migdall, Sae Woo Nam, Richard P. Mirin, Emanuel H. Knill
We have created heralded coherent-state superpositions (CSSs) by subtracting up to three photons from a pulse of squeezed vacuum light. To produce such CSSs at a sufficient rate, we used our high-efficiency photon-number-resolving transition edge sensor to

Superconducting Transition-Edge Sensors for Waveguide Coupled Single Photon Detection

July 25, 2010
Author(s)
Anna E. Fox, Adriana E. Lita, Brice R. Calkins, Kevin L. Silverman, Richard P. Mirin, Sae Woo Nam
We present the design and important preliminary superconducting properties of an evanescently coupled number resolving single photon detector operating near 1550 nm in development for integration into a silicon-on-insulator waveguide based optical system.

Generation of optical Schrodinger cat states by number-resolved squeezed photon subtraction

July 23, 2010
Author(s)
Thomas Gerrits, Scott C. Glancy, Tracy S. Clement, Brice R. Calkins, Adriana E. Lita, Aaron J. Miller, Alan L. Migdall, Aaron J. Miller, Sae Woo Nam, Richard P. Mirin, Emanuel H. Knill
We have generated and measured an approximation of an optical Schrödinger cat state by photon subtraction from squeezed vacuum. Figure 1 shows the experimental scheme. Photons are probabilistically subtracted from squeezed vacuum and detected with a photon

Joint spectral distribution of a periodically poled KTP source for quantum information applications

July 23, 2010
Author(s)
Thomas Gerrits, Burm Baek, Martin J. Stevens, Tracy S. Clement, Sae Woo Nam, Robert Hadfield, Ryan Bennink, Warren Grice, Sander N. Dorenbos, Tony Zijlstra, Teun Klapwijk, Val Zwiller
We present our experimental results obtained from a periodically poled KTP (pp-KTP) crystal designed to produce a pure squeezed vacuum near 1550 nm. A pure squeezed vacuum in a single mode is one of the building blocks towards high fidelity optical cat

Observation of Transparency of Erbium-doped Silicon nitride in photonic crystal nanobeam cavities

June 14, 2010
Author(s)
Yiyang Gong, Maria Makarova, Selcuk Yerci, Rui Li, Martin Stevens, Burm Baek, Sae Woo Nam, Luca Dal Negro, Jelena Vuckovic
One dimensional nanobeam photonic crystal cavities are fabricated in an Er-doped amorphous silicon nitride layer. Photoluminescence from the cavities around 1.54 mm is studied at cryogenic and room temperatures at different optical pump powers. The

Real Time Data Acquisition Platform for Pulsed Measurements

June 14, 2010
Author(s)
Sergey V. Polyakov, Alan L. Migdall, Sae Woo Nam
We present an inexpensive and simple data acquisition platform based on Field Programmable Gate Arrays (FPGAs) designed to acquire and characterize fast digital or analog electrical signal real time for processing on a generic personal computer. While the

Enhanced telecom wavelength single-photon detection with NbTiN superconducting nanowires on oxidized silicon

June 3, 2010
Author(s)
Michael G. Tanner, C. M. Natarajan, V. K. Pottapenjara, J. A. O?Connor, R. J. Warburton, Robert Hadfield, Burm Baek, Sae Woo Nam, S. Dorenbos, T. Zijlstra, Teun Klapwijk, Val Zwiller
Superconducting nanowire single-photon detectors (SNSPDs) have emerged as a highly promising infrared single-photon detector technology. Next-generation devices are being developed with enhanced detection efficiency (DE) at key technological wavelengths

Single photon detection timing jitter in a visible light photon counter

June 1, 2010
Author(s)
Burm Baek, Kyle S. McKay, Martin J. Stevens, Jungsang Kim, Henry H. Hogue, Sae Woo Nam
Visible light photon counters (VLPCs) offer many attractive features as photon detectors, such as high quantum efficiency and photon number resolution.We report measurements of the single-photon timing jitter in a VLPC, a critical performance factor in a