Creation of Two-Particle Entanglement in Open Macroscopic Quantum Systems

Fausto Borgonovi, Marco Merkli, Gp Berman, Vi Tsifrinovich

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

2 Citazioni (Scopus)

Abstract

We consider an open quantum system of N not directly interacting spins qubits in contact with both local and collective thermal environments. The qubit-environment interactions are energy conserving. We trace out the variables of the thermal environments and N − 2 qubits to obtain the time-dependent reduced density matrix for two arbitrary qubits. We numerically simulate the reduced dynamics and the creation of entanglement concurrence as a function of the parameters of the thermal environments and the number of qubits, N. Our results demonstrate that the two- qubit entanglement generally decreases as N increases. We show analytically that, in the limit N → ∞, no entanglement can be created. This indicates that collective thermal environments cannot create two-qubit entanglement when many qubits are located within a region of the size of the environment coherence length. We discuss possible relevance of our consideration to recent quantum information devices and biosystems.
Lingua originaleEnglish
pagine (da-a)1-15
Numero di pagine15
RivistaAdvances in Mathematical Physics
Volume2012
DOI
Stato di pubblicazionePubblicato - 2012

Keywords

  • entanglement
  • open quantum systems

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