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related topics |
{states, state, optimal} |
{alice, bob, state} |
{state, phys, rev} |
{state, states, entangled} |
{let, theorem, proof} |
{theory, mechanics, state} |
{energy, state, states} |
{information, entropy, channel} |
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Quantum cloning with nonlocal assistance: Complement of Jozsa's stronger
no-cloning theorem
Koji Azuma, Masato Koashi, Hosho Katsura, Nobuyuki Imoto
abstract: We investigate the cases where a set $S$ of states $\{\ket{\psi_i} \}$ cannot
be cloned by itself, but is clonable with the help of another system prepared
in state $\hat{\rho}_i$. When $S$ is pair-wise nonorthogonal, it is known that
one can generate the copy from $\hat{\rho}_i$ alone, with no interaction with
the original system. Here we show that a set containing orthogonal pairs
exhibits a property forming a striking contrast; For any such set, there is a
choice of $\hat{\rho}_i$ that enables cloning only when the two systems are
interacted in a purely quantum manner that is not achievable via classical
communication.
- oai_identifier:
- oai:arXiv.org:quant-ph/0604009
- categories:
- quant-ph
- comments:
- 4 pages, 1 figure
- arxiv_id:
- quant-ph/0604009
- created:
- 2006-04-03
Full article ▸
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