No-compressing of quantum phase information

Details No-compressing of quantum phase information No-compressing of quantum phase information

2011-05-26

arxiv.org/abs/1105.5258v4

J.Phys.A 45, 025304(2012)

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

10.1088/1751-8113/45/2/025304

We raise a general question of quantum information theory whether the quantum phase information can be compressed and retrieved. A general qubit contains both amplitude and phase information, while an equatorial qubit contains only a phase information. We study whether it is possible to compress the phase information of n equatorial qubits into m general qubits with m being less than n, and still those information can be retrieved perfectly. We prove that this process is not allowed by quantum mechanics.

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