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Optimal unambiguous discrimination between subsets of non-orthogonal quantum states
Yuqing Sun, Janos A. Bergou, Mark Hillery
It is known that unambiguous discrimination among non-orthogonal but linearly independent quantum states is possible with a certain probability of success. Here, we consider a vari…
Quantum homogenization
M. Ziman, P. Stelmachovic, V. Buzek +3
We design a universal quantum homogenizer, which is a quantum machine that takes as an input a system qubit initially in the state and a set of N reservoir qubits initially pre…
Probabilistic implementation of universal quantum processors
Mark Hillery, Vladimir Buzek, Mario Ziman
We present a probabilistic quantum processor for qudits. The processor itself is represented by a fixed array of gates. The input of the processor consists of two registers. In the…
Singlet states and the estimation of eigenstates and eigenvalues of an unknown Controlled-U gate
Mark Hillery, Vladimir Buzek
We consider several problems that involve finding the eigenvalues and generating the eigenstates of unknown unitary gates. We first examine Controlled-U gates that act on qubits, a…
Universal state inversion and concurrence in arbitrary dimensions
Pranaw Rungta, V. Buzek, Carlton M. Caves +2
Wootters [Phys. Rev. Lett. 80, 2245 (1998)] has given an explicit formula for the entanglement of formation of two qubits in terms of what he calls the concurrence of the joint den…