Quantum entanglement of symmetrically decohered two-mode squeezed states in an absorbing and amplifying environment
- Department of Physics and Institute of Theoretical Physics, Chinese University of Hong Kong, Shatin, Hong Kong (China)
We investigate the properties of quantum entanglement of two-mode squeezed states interacting with symmetric linear baths with general gain and loss parameters. By explicitly solving for {rho} from the master equation, we determine analytical expressions of eigenvalues and eigenvectors of {rho}{sup T{sub A}} (the partial transposition of density matrix {rho}). In Fock space, {rho}{sup T{sub A}} is shown to maintain a block diagonal structure as the system evolves. In addition, we discover that the decoherence induced by the baths would break the degeneracy of {rho}{sup T{sub A}}, and leads to a set of eigenvectors for the construction of entanglement witness operators. Such eigenvectors are shown to be time independent, which is a signature of robust entanglement of two-mode squeezed states in the presence of noise.
- OSTI ID:
- 21011200
- Journal Information:
- Physical Review. A, Vol. 76, Issue 1; Other Information: DOI: 10.1103/PhysRevA.76.012333; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
Entanglement in SU(2)-invariant quantum systems: The positive partial transpose criterion and others
Sudden vanishing of spin squeezing under decoherence