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Quantum Communications

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Displaying 126 - 150 of 197

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

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

Entangled photon generation in a phase-modulated, quasi-phasematched crystal

October 14, 2013
Author(s)
Paulina S. Kuo, Jason S. Pelc, Oliver T. Slattery, Yong-Su Kim, Xiao Tang
We propose a scheme to generate polarization-entangled photon pairs by spontaneous parametric downconversion in a phase-modulated, type-II, quasi-phasematched (QPM) crystal. Instead of using two distinct crystals to generate |HV>and |VH> states, the phase

High quantum-efficiency photon-number-resolving detector for photonic on-chip information processing

September 18, 2013
Author(s)
Brice R. Calkins, Paolo L. Mennea, Adriana E. Lita, Benjamin Metcalf, Steven Kolthammer, Antia A. Lamas-Linares, Justin Spring, Peter C. Humphreys, Richard P. Mirin, James Gates, Peter Smith, Ian Walmsley, Thomas Gerrits, Sae Woo Nam
The integrated optical circuit is a promising architecture for the realization of complex quantum optical states and information networks. One element that is required for many of these applications is a high-efficiency photon detector capable of photon

Two-photon interference with continuous-wave operating multi-mode coherent light

September 12, 2013
Author(s)
Yong-Su Kim, Oliver T. Slattery, Paulina Kuo, Xiao Tang
We report two-photon interference with continuous-wave multi-mode coherent light. We show that the two-photon interference, in terms of the detection time difference, reveals two-photon beating fringes with the visibility V = 0.5. While scanning the

Mode reconstruction of a light field by multi-photon statistics

July 15, 2013
Author(s)
Elizabeth A. Goldschmidt, Fabrizio Piacentini, I. Ruo Berchera, Sergey V. Polyakov, Silke Peters, Stefan Kuck, Giorgio Brida, Ivo P. Degiovanni, Alan L. Migdall, Marco Genovese
Knowing the underlying number and structure of occupied modes of a light field plays a crucial role in minimizing loss and decoherence of quantum information. Typically, full characterization of the mode structure involves a series of several separate

Conditions for two-photon interference with coherent pulses

July 1, 2013
Author(s)
Yong-Su Kim, Oliver T. Slattery, Paulina Kuo, Xiao Tang
We report experiments on two-photon interference between temporally non-overlapping weak coherent pulses. While the single-photon interference is washed out, the two-photon interference shows a Hong-Ou-Mandel dip with visibility of 0.50±0.09, which shows

Frequency Correlated Bi-Photon Spectroscopy using a Tunable Up-Conversion Detector

May 21, 2013
Author(s)
Oliver T. Slattery, Lijun Ma, Paulina S. Kuo, Yong-Su Kim, Xiao Tang
We demonstrated a scheme for frequency correlated bi-photon spectroscopy using a strongly non- degenerate down-conversion source and a tunable up-conversion detector. In this scheme, the spectral function at one wavelength range of a remote object can be

Reducing noise in single-photon frequency conversion

April 10, 2013
Author(s)
Paulina S. Kuo, Jason S. Pelc, Oliver T. Slattery, Yong-Su Kim, Martin M. Fejer, Xiao Tang
We demonstrate low-noise and efficient frequency conversion using sum-frequency mixing in a periodically poled LiNbO3 (PPLN) waveguide. Using a 1556 nm pump, 1302 nm photons are efficiently converted to 709 nm photons. We obtain 70% conversion efficiency

Experimental demonstration of a receiver beating the standard quantum limit for multiple nonorthogonal coherent-state discrimination

January 6, 2013
Author(s)
Francisco E. Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Julius Goldhar, Jonathan Kosloski, Alan L. Migdall
The measurement of the state of a quantum system with inherent quantum uncertainty (noise) approaching the ultimate physical limits is of both technological and fundamental interest. Quantum noise prevents any mutually nonorthogonal quantum states, such as

Adaptive measurements in nonorthogonal state discrimination

December 18, 2012
Author(s)
Francisco E. Becerra Chavez, Alan L. Migdall
Adaptive measurements represent important resources in quantum information science and quan- tum technologies. They take advantage of the knowledge of partial measurements of the system to optimize subsequent measurements and perform tasks that are dicult