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math-ph2016
Parametrizations of degenerate density matrices
Erwin Brüning, Shigeaki Nagamachi
It turns out that a parametrization of degenerate density matrices requires a parametrization of $\mathfrak{F}=U(n)/({U(k_1)\times U(k_2)\times \cdots \times U(k_m)})\quad n=k_1 +\…
math-ph2009
Teleportation of Continuous Quantum Variables: A New Approach
S. Nagamachi, E. Brüning
Teleportation of optical field states (as continuous quantum variables) is usually described in terms of Wigner functions. This is in marked contrast to the theoretical treatment o…