Physics – Quantum Physics
Scientific paper
2008-10-27
Phys. Rev. A 79, 012306 (2009)
Physics
Quantum Physics
23 pages, 4 figures
Scientific paper
10.1103/PhysRevA.79.012306
The notion of "paired" fermions is central to important condensed matter phenomena such as superconductivity and superfluidity. While the concept is widely used and its physical meaning is clear there exists no systematic and mathematical theory of pairing which would allow to unambiguously characterize and systematically detect paired states. We propose a definition of pairing and develop methods for its detection and quantification applicable to current experimental setups. Pairing is shown to be a quantum correlation different from entanglement, giving further understanding in the structure of highly correlated quantum systems. In addition, we will show the resource character of paired states for precision metrology, proving that the BCS states allow phase measurements at the Heisenberg limit.
Cirac Juan Ignacio
Giedke Géza
Kraus Christina V.
Wolf Michael M.
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