361 citations · 695 across the 11 of their papers we have counts for
9 papers · 1 filter
Any quantum state can be cloned in the presence of closed timelike curves
D. Ahn, T. C. Ralph, R. B. Mann
The possible existence of closed timelike curves (CTCs) draws attention to fundamental questions about what is physically possible and what is not. An example is the "no cloning th…
Quantum nonlocality test for continuous-variable states with dichotomic observables
H. Jeong, W. Son, M. S. Kim +2
There have been theoretical and experimental studies on quantum nonlocality for continuous variables, based on dichotomic observables. In particular, we are interested in two cases…
Entanglement induced by a single-mode heat environment
M. S. Kim, J. Lee, D. Ahn +1
A thermal field, which frequently appears in problems of decoherence, provides us with minimal information about the field. We study the interaction of the thermal field and a quan…
Entangled Quantum Clocks for Measuring Proper-Time Difference
W. Y. Hwang, D. Ahn, S. W. Hwang +1
We report that entangled pairs of quantum clocks (non-degenerate quantum bits) can be used as a specialized detector for precisely measuring difference of proper-times that each co…
Quantum Gambling Using Two Nonorthogonal States
W. Y. Hwang, D. Ahn, S. W. Hwang
We give a (remote) quantum gambling scheme that makes use of the fact that quantum nonorthogonal states cannot be distinguished with certainty. In the proposed scheme, two particip…
Eavesdropper's Optimal Information in Variations of Bennett-Brassard 1984 Quantum Key Distribution in the Coherent Attacks
W. Y. Hwang, D. Ahn, S. W. Hwang
We calculate eavesdropper's optimal information on raw bits in Bennett-Brassard 1984 quantum key distribution (BB84 QKD) and six-state scheme in coherent attacks, using a formula b…