aqora

Entanglement Generation in a Two-Qubit System Coupled to Vacuum Electromagnetic Field

Saeed Pegahan

Bulletin of the American Physical SocietyMar 4, 20140 citations

Entanglement Generation for Two Coupled Multi-excitation Fields Interacting with Qubits

Li-Tuo Shen, Wen-Zhang Li, Rongxin Chen +1 more

International Journal of Theoretical PhysicsOct 19, 20131 citation

Entanglement dynamics for uniformly accelerated two-level atoms coupled with electromagnetic vacuum fluctuations

Yiquan Yang, Jiawei Hu, Hongwei Yu

We investigate the entanglement dynamics of two uniformly accelerated atoms with the same acceleration perpendicular to their separation. The two-atom system is treated as an open system coupled with fluctuating electromagnetic fields in the Minkowski vacuum, and in the Born--Markov approximation the master equation that describes the completely positive time evolution of the two-atom system is derived. In particular, we investigate the phenomena of entanglement degradation, generation, revival and enhancement. As opposed to the scalar-field case, the entanglement dynamics is crucially dependent on the polarization directions of the atoms. For the two-atom system with certain acceleration and separation, the polarization directions of the atoms may determine whether entanglement generation, revival or enhancement happens, while for entanglement degradation, they affect the decay rate of entanglement. A comparison between the entanglement evolution of accelerated atoms and that of static ones immersed in a thermal bath at the Unruh temperature shows that they are the same only when the acceleration is extremely small.We investigate the entanglement dynamics of two uniformly accelerated atoms with the same acceleration perpendicular to their separation. The two-atom system is treated as an open system coupled with fluctuating electromagnetic fields in the Minkowski vacuum, and in the Born--Markov approximation the master equation that describes the completely positive time evolution of the two-atom system is derived. In particular, we investigate the phenomena of entanglement degradation, generation, revival and enhancement. As opposed to the scalar-field case, the entanglement dynamics is crucially dependent on the polarization directions of the atoms. For the two-atom system with certain acceleration and separation, the polarization directions of the atoms may determine whether entanglement generation, revival or enhancement happens, while for entanglement degradation, they affect the decay rate of entanglement. A comparison between the entanglement evolution of accelerated atoms and that of static ones immersed in a thermal bath at the Unruh temperature shows that they are the same only when the acceleration is extremely small.

arXiv:1609.06820Physical Review ASep 30, 201636 citations

Dynamics of entanglement of two dipole-coupled Josephson qubits interacting with two lossless resonators

Eugene K. Bashkirov, Башкиров Е. К

In the present paper we investigated the dynamics of two dipole-coupled superconducting qubits prepared in an entangled state and interacting with two modes of the vacuum electromagnetic fields of two independent resonators. It is shown that the dipole-dipole interaction of qubits is an effective mechanism for the stabilization of qubits entanglement.

Physics of Wave Processes and Radio SystemsJun 15, 20161 citation

Local Entanglement Generation in Two-Qubit Systems

Andrzej Veitia

Jan 1, 20100 citations

Entanglement Generated by Dissipation and Steady State Entanglement of Two Macroscopic Objects

Hanna Krauter, Christine A. Muschik, Kasper Jensen +4 more

Entanglement is a striking feature of quantum mechanics and an essential ingredient in most applications in quantum information. Typically, coupling of a system to an environment inhibits entanglement, particularly in macroscopic systems. Here we report on an experiment where dissipation continuously generates entanglement between two macroscopic objects. This is achieved by engineering the dissipation using laser and magnetic fields, and leads to robust event-ready entanglement maintained for 0.04 s at room temperature. Our system consists of two ensembles containing about 10(12) atoms and separated by 0.5 m coupled to the environment composed of the vacuum modes of the electromagnetic field. By combining the dissipative mechanism with a continuous measurement, steady state entanglement is continuously generated and observed for up to 1 h.Entanglement is a striking feature of quantum mechanics and an essential ingredient in most applications in quantum information. Typically, coupling of a system to an environment inhibits entanglement, particularly in macroscopic systems. Here we report on an experiment where dissipation continuously generates entanglement between two macroscopic objects. This is achieved by engineering the dissipation using laser and magnetic fields, and leads to robust event-ready entanglement maintained for 0.04 s at room temperature. Our system consists of two ensembles containing about 10(12) atoms and separated by 0.5 m coupled to the environment composed of the vacuum modes of the electromagnetic field. By combining the dissipative mechanism with a continuous measurement, steady state entanglement is continuously generated and observed for up to 1 h.

arXiv:1006.4344Physical Review LettersAug 17, 2011587 citations

Entanglement Generation in a Two-Qubit System Coupled to Vacuum Electromagnetic Field

Related papers

Entanglement Generation in a Two-Qubit System Coupled to Vacuum Electromagnetic Field

Related papers