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Verification of quantum discord
Saleh Rahimi-Keshari, Carlton M. Caves, Timothy C. Ralph
We introduce a measurement-based method for verifying quantum discord of any bipartite quantum system. We show that by performing an informationally complete POVM (IC-POVM) on one…
Quantum limits on phase-preserving linear amplifiers
Carlton M. Caves, Joshua Combes, Zhang Jiang +1
The purpose of a phase-preserving linear amplifier is to make a small signal larger, regardless of its phase, so that it can be perceived by instruments incapable of resolving the…
Mean-field dynamics of two-mode Bose-Einstein condensates in highly anisotropic potentials: Interference, dimensionality, and entanglement
Alexandre B. Tacla, Carlton M. Caves
We study the mean-field dynamics and the reduced-dimension character of two-mode Bose-Einstein condensates (BECs) in highly anisotropic traps. By means of perturbative techniques,…
Evading quantum mechanics
Mankei Tsang, Carlton M. Caves
Quantum mechanics is potentially advantageous for certain information-processing tasks, but its probabilistic nature and requirement of measurement back action often limit the prec…
Ancilla models for quantum operations: For what unitaries does the ancilla state have to be physical?
Zhang Jiang, Marco Piani, Carlton M. Caves
Any evolution described by a completely positive trace-preserving linear map can be imagined as arising from the interaction of the evolving system with an initially uncorrelated a…