Probabilistic and information-theoretic interpretation of quantum evolutions

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Probabilistic and information-theoretic interpretation of quantum evolutions

Oppenheim, J; Reznik, B; (2004) Probabilistic and information-theoretic interpretation of quantum evolutions. Physical Review A , 70 , Article 2. 10.1103/PhysRevA.70.022312. Green open access

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Abstract

In quantum mechanics, outcomes of measurements on a state have a probabilistic interpretation while the evolution of the state is treated deterministically. Here we show that one can also treat the evolution as being probabilistic in nature and one can measure which unitary acted. In further analogy to states, one can also choose which basis of unitaries to measure. Likewise, one can give an information-theoretic interpretation to evolutions by defining the entropy of a completely positive map. This entropy gives the rate at which the informational content of the evolution can be compressed. One cannot compress this information and still have the evolution act on an unknown state, but we demonstrate a general scheme to do so probabilistically. This allows one to generalize super-dense coding to the sending of quantum information. One can also define the “interaction-entanglement” of a unitary, and concentrate this entanglement.

Type:	Article
Title:	Probabilistic and information-theoretic interpretation of quantum evolutions
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1103/PhysRevA.70.022312
Publisher version:	http://dx.doi.org/10.1103/PhysRevA.70.022312
Language:	English
Additional information:	© 2004 The American Physical Society
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI:	https://discovery.ucl.ac.uk/id/eprint/1362159