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quant-ph2003
Disturbance of operation in quantum estimation for the Gaussian P-function
Yoshiyuki Tsuda, Keiji Matsumoto, Masahito Hayashi
For the quantum Gaussian state family, Hayashi proposed a quantum mechanical operation using beam splitters to estimate the location and scale parameters of the P-function, and he…
quant-ph2002
Quantum estimation for non-differentiable models
Yoshiyuki Tsuda, Keiji Matsumoto
State estimation is a classical problem in quantum information. In optimization of estimation scheme, to find a lower bound to the error of the estimator is a very important step.…
quant-ph2001
Restoration of Entanglement by Spectral Filters
K. Usami, Y. Nambu, S. Ishizaka +4
We experimentally demonstrate that entanglement of bi-photon polarization state can be restored by spectral filters. This restoration procedure can be viewed as a new class of quan…