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Search Publications by: Xiao Tang (Assoc)

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Displaying 76 - 100 of 103

Low-Noise PPLN-based Single-Photon Detector

February 13, 2007
Author(s)
Hai Xu, Lijun Ma, Oliver T. Slattery, Xiao Tang
This paper describes the detection of single photons, which have been transmitted through standard fiber at the telecom wavelength of 1310 nm. Following transmission, the 1310-nm photon is up-converted to 710 nm in a periodical-poled LiNbO3 (PPLN)

Demonstration of an Active Quantum Key Distribution Network

August 1, 2006
Author(s)
Xiao Tang, Lijun Ma, Alan Mink, Anastase Nakassis, Hai Xu, Barry J. Hershman, Joshua Bienfang, David H. Su, Ronald Boisvert, Charles W. Clark, Carl J. Williams
We previously demonstrated a high speed, point to point, quantum key distribution (QKD) system with polariztion coding over a fiber link, in which the resulting cryptographic keys were used for one-time pad encryption of real time video signals. In this

Quantum Key Distribution System Operating at Sifted-Key Rate over 4 Mbit/s

June 19, 2006
Author(s)
Xiao Tang, Lijun Ma, Alan Mink, Anastase Nakassis, Hai Xu, Barry J. Hershman, Joshua Bienfang, David H. Su, Ronald Boisvert, Charles W. Clark, Carl J. Williams
A complete fiber-based polarization encoding quantum key distribution (QKD) system based on the BB84 protocol has been developed at National Institute of Standard and Technology (NIST). The system can be operated at a sifted key rate of more than 4 Mbit/s

High Speed Quantum Key Distribution System Supports One-Time Pad Encryption of Real-Time Video

April 21, 2006
Author(s)
Alan Mink, Xiao Tang, Lijun Ma, Anastase Nakassis, Barry J. Hershman, Joshua C. Bienfang, David H. Su, Ronald F. Boisvert, Charles W. Clark, Carl J. Williams
NIST has developed a high-speed quantum key distribution (QKD) test bed incorporating both free-space and fiber systems. These systems demonstrate a major increase in the attainable rate of QKD systems: over two orders of magnitude faster than other

High Speed Quantum Key Distribution System Supports One-Time Pad Encryption of Real-Time Video

April 1, 2006
Author(s)
Alan Mink, Xiao Tang, Lijun Ma, Anastase Nakassis, Barry J. Hershman, Joshua Bienfang, David H. Su, Ronald Boisvert, Charles W. Clark, Carl J. Williams
NIST has developed a high-speed quantum key distribution (QKD) test bed incorporating both free-space and fiber systems. These systems demonstrate a major increase in the attainable rate of QKD systems: over two orders of magnitude faster than other

Is Quantum Cryptography Provably Secure?

April 1, 2006
Author(s)
Anastase Nakassis, Joshua Bienfang, P. Johnson, Alan Mink, D. Rogers, Xiao Tang, Carl J. Williams
Quantum cryptography asserts that shared secrets can be established over public channels in such a way that the total information of an eavesdropper can be made arbitrarily small with probability arbitrarily close to 1. As we will show below, the current

High Speed Fiber-Based Quantum Key Distribution using Polarization Encoding

October 5, 2005
Author(s)
Xiao Tang, Lijun Ma, Alan Mink, Anastase Nakassis, Barry J. Hershman, Joshua Bienfang, Ronald Boisvert, Charles W. Clark, Carl J. Williams, A Gross, E Hagley, J Wen
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

High Speed Fiber-Based Quantum Key Distribution Using Polarization Encoding

October 1, 2005
Author(s)
Xiao Tang, Lijun Ma, Alan Mink, Anastase Nakassis, Barry J. Hershman, J Bienfan, Ronald Boisvert, Charles W. Clark, Carl J. Williams
The n-qubit concurrence canonical decomposition (CCD) is a generalization of the two-qubit canonical decomposition SU(4)=[SU(2) (x) SU(2)] ? [SU(2) (x) SU(2)], where ? is the commutative group which phases the maximally entangled Bell basis. A prequel

Change Detection In XML Documents

March 1, 2003
Author(s)
K H. Lee, Y C. Choy, S B. Cho, Xiao Tang, V R. McCrary
This paper presents an efficient algorithm to detect changes between old and new versions of an XML document. The difference between the two versions can be considered to be an edit script that transforms one document tree into another. The proposed

High Precision Measurement of Reflectance for Films Under Substrates

December 1, 2002
Author(s)
Xiao Tang, Jian Zheng
A more accurate methodology to measure the reflectance of optical disks, taking into consideration the scattering losses at the surfaces of the disk, is proposed by the National Institute of Standards and Technology (NIST). The proposed method is a

High-Speed Quantum Communication Testbed

December 1, 2002
Author(s)
Carl J. Williams, Xiao Tang, M Hiekkero, J Rouzard, R Lu, A Goedecke, Alan L. Migdall, Alan Mink, Anastase Nakassis, Leticia S. Pibida
We describe the current status of the NIST Quantum Communication Testbed (QCT) facility. QCT is a facility for exploring quantum communication in an enviornment similar to that projected for early commercial implementations: quantum cryptographic key

Document Reverse Engineering: From Paper to XML

August 1, 2002
Author(s)
K H. Lee, Y C. Choy, S B. Cho, Xiao Tang, V R. McCrary
With the widespread of XML documents on the Web, there is a growing interest in transforming paper-based documents into XML representations. In this paper, we present a syntactic method for logical structure analysis of documents with multiple pages and

Reflectance Calibration Standard for Optical Discs

January 1, 2002
Author(s)
Xiao Tang, Jian Zheng
An accurate method for the determination of reflectance of reference discs has been developed at NIST. The discs can be used as a traceable industry standard in the calibration of optical disc testing equipment.