Remarks on separability of compound quantum systems and time reversal |
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Authors: | Paul Busch Pekka J Lahti |
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Institution: | (1) Department of Applied Mathematics, The University of Hull, HU6 7RX Hull, United Kingdom;(2) Department of Physics, University of Turku, FIN-20014 Turku, Finland |
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Abstract: | A separability test for density matrices of compound quantum systems proposed recently by Peres is formulated in a manifestly
basis independent way using antiunitary operators. We prove that the test amounts to a criterion for pure states, while it
is known to fail to do so in the case of mixed states. An interesting connection with the operation of time reversal is thus
exhibited. |
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Keywords: | entanglement (in)separability antiunitary maps time reversal |
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