2009/07/31 by Tommaso Tufarelli, M. S. Kim, Sougato Bose
Computer Science · Physics and Astronomy · #Computer science #Master equation #Mechanical and Optical Resonators #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum mechanics #Qubit #Statistical physics #Thermal #Topology (electrical circuits) #Variety (cybernetics) #quant-ph
paper · pdf · doi:10.1103/physreva.80.062317
published as Phys. Rev. A 80, 062317 (2009) · 6 pages, 3 figures containing 7 pictures
openalex publication_date 2009/12/08 · arxiv created 2009/12/11 · arxiv updated 2010/01/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider two separated oscillators initially in equilibrium and continuously interacting with thermal environments and propose a way to entangle them using a mediating qubit. An appropriate interaction allows for an analytic treatment of the open system, removes the necessity of fine-tuning interaction times, and results in a high tolerance of the entanglement to finite temperature. The entanglement thus produced between the oscillators can be verified either through a Bell inequality relying on oscillator parity measurements or through conditional extraction of the entanglement on two mutually noninteracting qubits. The latter process also shows that the generated mixed-entangled state of the oscillators is an useful resource for entangling qubits. By allowing for influences from environments, taking feasible qubit-oscillator interactions and measurement settings, this scheme should be implementable in a variety of experimental setups. The method presented for the solution of the master equation can also be adapted to a variety of problems involving the same form of qubit-oscillator interaction