期刊
PHYSICAL REVIEW A
卷 79, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.012306
关键词
BCS theory; fermion systems; Heisenberg model; information theory; superconductivity; superfluidity
资金
- Elite Network of Bavaria QCCC
- DFG within SFB 631
- DFG Cluster of Excellence Munich-Centre for Advanced Photonics
- QUANTOP
- Danish Natural Science Research Council (FNU)
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 that would allow us 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.
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