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Negativity of the Wigner function as an indicator of non-classicality

Anatole Kenfack1,2,5 and Karol Życzkowski3,4

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A measure of non-classicality of quantum states based on the volume of the negative part of the Wigner function is proposed. We analyse this quantity for Fock states, squeezed displaced Fock states and cat-like states defined as coherent superposition of two Gaussian wavepackets.


PACS

42.50.Dv Quantum state engineering and measurements

03.65.-w Quantum mechanics

02.50.Cw Probability theory

Subjects

Computational physics

Optics, quantum optics and lasers

Quantum information and quantum mechanics

Dates

Issue 10 (October 2004)

Received 23 June 2004, accepted for publication 16 August 2004

Published 24 August 2004



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