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38 papers · 2 filters
Noisy metrology beyond the standard quantum limit
R. Chaves, J. B. Brask, M. Markiewicz +2
Parameter estimation is of fundamental importance in areas from atomic spectroscopy and atomic clocks to gravitational wave detection. Entangled probes provide a significant precis…
Testing nonlocality of a single photon without a shared reference frame
Jonatan Bohr Brask, Rafael Chaves, Nicolas Brunner
The question of testing the nonlocality of a single photon has raised much debate over the last years. The controversy is intimately related to the issue of providing a common refe…
Trapping of Topological-Structural Defects in Coulomb Crystals
M. Mielenz, H. Landa, J. Brox +5
We study experimentally and theoretically structural defects which are formed during the transition from a laser cooled cloud to a Coulomb crystal, consisting of tens of ions in a…
Constructive entanglement test from triangle inequality
Łukasz Rudnicki, Zbigniew Puchała, Paweł Horodecki +1
We derive a simple lower bound on the geometric measure of entanglement for mixed quantum states in the case of a general multipartite system. The main ingredient of the presented…
Nonlocal memory effects allow perfect teleportation with mixed states
Elsi-Mari Laine, Heinz-Peter Breuer, Jyrki Piilo
We show that perfect quantum teleportation can be achieved with mixed photon polarization states when nonlocal memory effects influence the dynamics of the quantum system. The prot…
Pinning of Fermionic Occupation Numbers
Christian Schilling, David Gross, Matthias Christandl
The Pauli exclusion principle is a constraint on the natural occupation numbers of fermionic states. It has been suspected since at least the 1970's, and only proved very recently,…