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Universal Quantum Estimator
Artur K. Ekert, Carolina Moura Alves, Daniel K. L. Oi +3
We present a simple device based on the controlled-SWAP gate that performs quantum state tomography. It can also be used to determine maximum and minimum eigenvalues, expectation v…
A Thermodynamical Approach to Quantifying Quantum Correlations
Jonathan Oppenheim, Michal Horodecki, Pawel Horodecki +1
We consider the amount of work which can be extracted from a heat bath using a bipartite state shared by two parties. In general it is less then the amount of work extractable when…
Direct detection of quantum entanglement
Pawel Horodecki, Artur Ekert
Quantum entanglement, after playing a significant role in the development of the foundations of quantum mechanics, has been recently rediscovered as a new physical resource with po…
From limits of quantum nonlinear operations to multicopy entanglement witnesses and state spectrum estimation
Pawel Horodecki
Limits of nonlinear in quantum mechanics are studied. Impossibility of physical implementation of the transformation in quantum mechanics is p…
Measuring quantum entanglement without prior state reconstruction
Pawel Horodecki
It is shown that, despite strong nonlinearity, entanglement of formation of two-qubit state can be measured without prior state reconstruction. Collective measurements on small num…
Reflections upon separability and distillability
D. Bruss, J. I. Cirac, P. Horodecki +4
We present an abstract formulation of the so-called Innsbruck-Hannover programme that investigates quantum correlations and entanglement in terms of convex sets. We present a unifi…