Research PapersNo Access

STATISTICAL QUANTUM OPERATION

SUMIYOSHI ABE

Department of Physical Engineering, Mie University, Mie 514-8507, Japan

Institut Supérieur des Matériaux et Mécaniques Avancés, 44 F. A. Bartholdi, 72000 Le Mans, France

Inspire Institute Inc., Alexandria, Virginia 22303, USA

Corresponding author.

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YUICHI ITTO

Department of Physical Engineering, Mie University, Mie 514-8507, Japan

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, and

MAMORU MATSUNAGA

Department of Physical Engineering, Mie University, Mie 514-8507, Japan

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https://doi.org/10.1142/S0217984910024407Cited by:2 (Source: Crossref)

Abstract

An explicit form of a generic unital quantum operation, which transforms a given stationary pure state to an arbitrary statistical state with perfect decoherence, is presented. This allows one to operationally realize the thermal state as a special case. The loss of information due to randomness generated by the operation is discussed by evaluating the entropy. Realization of the thermal state of a bipartite spin-1/2 system is discussed as an illustrative example.

Keywords:

PACS: 05.30.-d, 03.65.-w, 05.30.Ch

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