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- The University of TokyoJP46 papers
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- National Institute of Advanced Industrial Science and TechnologyJP18 papers
- RIKEN Center for Emergent Matter ScienceJP18 papers
- Massachusetts Institute of TechnologyUS17 papers
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5 papers · 2 filters
Quantum channel locally interacting with environment
Satoshi Ishizaka
The quantum channel subject to local interaction with two-level environment is studied. The two-level environment is regarded as a quantum bit (qubit) as well as a pair of particle…
Optimal dense coding with mixed state entanglement
Tohya Hiroshima
I investigate dense coding with a general mixed state on the Hilbert space shared between a sender and receiver. The following result is proved. When the sende…
Decoherence and Entanglement in Two-mode Squeezed Vacuum States
Tohya Hiroshima
I investigate the decoherence of two-mode squeezed vacuum states by analyzing the relative entropy of entanglement. I consider two sources of decoherence: (i) the phase damping and…
Local and Nonlocal Properties of Werner States
Tohya Hiroshima, Satoshi Ishizaka
We consider a special kind of mixed states -- a {\it Werner derivative}, which is the state transformed by nonlocal unitary -- local or nonlocal -- operations from a Werner state.…
Maximally entangled mixed states in two qubits
Satoshi Ishizaka, Tohya Hiroshima
We propose novel mixed states in two qubits, ``maximally entangled mixed states'', which have a property that the amount of entanglement of these states cannot be increased further…