Abstract
We show that there exist bipartite quantum states which contain a large locked classical correlation that is unlocked by a disproportionately small amount of classical communication. In particular, there are [Formula presented]-qubit states for which a one-bit message doubles the optimal classical mutual information between measurement results on the subsystems, from [Formula presented] bits to [Formula presented] bits. This phenomenon is impossible classically. However, states exhibiting this behavior need not be entangled. We study the range of states exhibiting this phenomenon and bound its magnitude.
Original language | English |
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Article number | 067902 |
Pages (from-to) | 067902-1 - 067902-4 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 92 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2004 |
Externally published | Yes |