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8 papers · 2 filters
Criteria and new classes of k-positive maps
Jinchuan Hou, Chi-Kwong Li, Yiu-Tung Poon +2
We study k-positive maps on operators. Proofs are given to different positivity criteria. Special attention is on positive maps arising in the study of quantum information science.…
A geometric characterization of invertible quantum measurement maps
Kan He, Jin-Chuan Hou, Chi-Kwong Li
A geometric characterization is given for invertible quantum measurement maps. Denote by the convex set of all states (i.e., trace-1 positive operators) on Hilber…
Linear preservers and quantum information science
Ajda Fosner, Zejun Huang, Chi-Kwong Li +1
Let be positive integers, the set of complex matrices and the set of complex matrices. Regard as the tensor space $M_m\otime…
Entanglement transformation between sets of bipartite pure quantum states using local operations
H. F. Chau, Chi-Hang Fred Fung, Chi-Kwong Li +2
Alice and Bob are given an unknown initial state chosen from a set of pure quantum states. Their task is to transform the initial state to a corresponding final pure state using lo…
Regularization of Tunneling Rates with Quantum Chaos
Louis M. Pecora, Hoshik Lee, Dong-Ho Wu
We study tunneling in various shaped, closed, two-dimensional, flat potential, double wells by calculating the energy splitting between symmetric and anti-symmetric state pairs. Fo…
All-atomic generation and noise-quadrature filtering of squeezed vacuum in hot Rb vapor
Travis Horrom, Gleb Romanov, Irina Novikova +1
With our all-atomic squeezing and filtering setup, we demonstrate control over the noise amplitudes and manipulation of the frequency-dependent squeezing angle of a squeezed vacuum…