Experimental investigation of pulsed entangled photons and photonic quantum channels

Yoshihiro Nambu; Koji Usami; Akihisa Tomita; Satoshi Ishizaka; Tohya Hiroshima; Yoshiyuki Tsuda; Keiji Matsumoto; Kazuo Nakamura

doi:10.1117/12.483034

13 September 2002 Experimental investigation of pulsed entangled photons and photonic quantum channels

Yoshihiro Nambu, Koji Usami, Akihisa Tomita, Satoshi Ishizaka, Tohya Hiroshima, Yoshiyuki Tsuda, Keiji Matsumoto, Kazuo Nakamura

Author Affiliations +

Proceedings Volume 4917, Quantum Optics in Computing and Communications; (2002) https://doi.org/10.1117/12.483034
Event: Photonics Asia, 2002, Shanghai, China

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.

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Yoshihiro Nambu, Koji Usami, Akihisa Tomita, Satoshi Ishizaka, Tohya Hiroshima, Yoshiyuki Tsuda, Keiji Matsumoto, and Kazuo Nakamura "Experimental investigation of pulsed entangled photons and photonic quantum channels", Proc. SPIE 4917, Quantum Optics in Computing and Communications, (13 September 2002); https://doi.org/10.1117/12.483034

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