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Proceedings Paper

Experimental investigation of pulsed entangled photons and photonic quantum channels
Author(s): Yoshihiro Nambu; Koji Usami; Akihisa Tomita; Satoshi Ishizaka; Tohya Hiroshima; Yoshiyuki Tsuda; Keiji Matsumoto; Kazuo Nakamura
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Paper Abstract

The development of key devices and systems in quantum information technology, such as entangled particle sources, quantum gates and quantum cryptographic systems, requires a reliable and well-established method for characterizing how well the devices or systems work. We report our recent work on experimental characterization of pulsed entangled photonic states and photonic quantum channels, using the methods of state and process tomography. By using state tomography, we could reliably evaluate the states generated from a two-photon source under development and develop a highly entangled pulsed photon source. We are also devoted to characterization of single-qubit and two-qubit photonic quantum channels. Characterization of typical single-qubit decoherence channels has been demonstrated using process tomography. Characterization of two-qubit channels, such as classically correlated channels and quantum mechanically correlated channels is under investigation. These characterization techniques for quantum states and quantum processes will be useful for developing photonic quantum devices and for improving their performances.

Paper Details

Date Published: 13 September 2002
PDF: 12 pages
Proc. SPIE 4917, Quantum Optics in Computing and Communications, (13 September 2002); doi: 10.1117/12.483034
Show Author Affiliations
Yoshihiro Nambu, NEC Corp. and CREST/Japan Science and Technology Corp. (Japan)
Koji Usami, Tokyo Institute of Technology and CREST/Japan Science and Technology Corp. (Japan)
Akihisa Tomita, NEC Corp., CREST/Japan Science and Technology Corp., and ERATO Japan Science and Technolog (Japan)
Satoshi Ishizaka, NEC Corp. and CREST/Japan Science and Technology Corp. (Japan)
Tohya Hiroshima, NEC Corp. and CREST/Japan Science and Technology Corp. (Japan)
Yoshiyuki Tsuda, ERATO/Japan Science and Technology Corp. (Japan)
Keiji Matsumoto, ERATO/Japan Science and Technology Corp. (Japan)
Kazuo Nakamura, NEC Corp., Tokyo Institute of Technology and Japan Science and Technology Corp. (Japan)


Published in SPIE Proceedings Vol. 4917:
Quantum Optics in Computing and Communications
Songhao Liu; Guangcan Guo; Hoi-Kwong Lo; Nobuyuki Imoto, Editor(s)

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