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4 papers · 2 filters
Quantum State Discrimination with General Figures of Merit
Won-Young Hwang, Yeong-Deok Han
We solve the problem of quantum state discrimination with "general (symmetric) figures of merit" for an even number of symmetric quantum bits with use of the no-signaling principle…
Comment on "Security Proof for Cryptographic Protocols Based Only on Monogamy of Bell's Inequality Violations"
Won-Young Hwang, Oleg Gittsovich
Recently, Pawlowski [Phys. Rev. A 82, 032313 (2010)] claimed to have proven the security of a quantum key distribution by using only the monogamy of Bell's inequality violations. I…
Optimal Discrimination of Qubit States - Methods, Solutions, and Properties
Joonwoo Bae, Won-Young Hwang
We show a geometric formulation for minimum-error discrimination of qubit states, that can be applied to arbitrary sets of qubit states given with arbitrary a priori probabilities.…
No-signaling Quantum Key Distribution: Solution by Linear Programming
Won-Young Hwang, Joonwoo Bae, Nathan Killoran
We outline a straightforward approach for obtaining a secret key rate using only no-signaling constraints and linear programming. Assuming an individual attack, we consider all pos…