Abstract
Entanglement of two distant macroscopic objects is a key element for implementing large-scale quantum networks consisting of quantum channels and quantum nodes. Entanglement swapping can entangle two spatially separated quantum systems without direct interaction. Here we propose a scheme of deterministically entangling two remote atomic ensembles via continuous-variable entanglement swapping between two independent quantum systems involving light and atoms. Each of two stationary atomic ensembles placed at two remote nodes in a quantum network is prepared to a mixed entangled state of light and atoms respectively. Then, the entanglement swapping is unconditionally implemented between the two prepared quantum systems by means of the balanced homodyne detection of light and the feedback of the measured results. Finally, the established entanglement between two macroscopic atomic ensembles is verified by the inseparability criterion of correlation variances between two anti-Stokes optical beams respectively coming from the two atomic ensembles.
Highlights
In practical applications of quantum information, the inevitable transmission loss limits the communication distance
All above-mentioned schemes of generating CV entanglement between atomic ensembles are realized in a local space and would not be suitable to build the entanglement between two remote nodes in quantum networks
In this paper we propose a scheme to produce the deterministic entanglement between two remote atomic ensembles based on applying CV entanglement swapping between two mixed entangled systems of light and atoms
Summary
Light-Atom Mixed Entanglement received: 05 March 2016 accepted: 21 April 2016 Published: 11 May 2016. We propose a scheme of deterministically entangling two remote atomic ensembles via continuous-variable entanglement swapping between two independent quantum systems involving light and atoms. Each of two stationary atomic ensembles placed at two remote nodes in a quantum network is prepared to a mixed entangled state of light and atoms respectively. All above-mentioned schemes of generating CV entanglement between atomic ensembles are realized in a local space and would not be suitable to build the entanglement between two remote nodes in quantum networks. In this paper we propose a scheme to produce the deterministic entanglement between two remote atomic ensembles based on applying CV entanglement swapping between two mixed entangled systems of light and atoms. The entanglement between atomic ensembles is confirmed by mapping atomic spin wave states into the anti-Stokes optical states and measuring the correlation variances between two anti-Stokes optical states
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
