Heralded entangling quantum gate via cavity-assisted photon scattering

Author(s)

Borges, Halyne S. ; Rossatto, Daniel Z. ; Luiz, Fabricio S. ; Villas-Boas, Celso J.

• Document type: Journal article
• Source: PHYSICAL REVIEW A; v. 97, n. 1, p. 10-pg., 2018-01-18.

Abstract

We theoretically investigate the generation of heralded entanglement between two identical atoms via cavity-assisted photon scattering in two different configurations, namely, either both atoms confined in the same cavity or trapped into locally separated ones. Our protocols are given by a very simple and elegant single-step process, the key mechanism of which is a controlled-phase-flip gate implemented by impinging a single photon on single-sided cavities. In particular, when the atoms are localized in remote cavities, we introduce a single-step parallel quantum circuit instead of the serial process extensively adopted in the literature. We also show that such parallel circuit can be straightforwardly applied to entangle two macroscopic clouds of atoms. Both protocols proposed here predict a high entanglement degree with a success probability close to unity for state-of-the-art parameters. Among other applications, our proposal and its extension to multiple atom-cavity systems step toward a suitable route for quantum networking, in particular for quantum state transfer, quantum teleportation, and nonlocal quantum memory. (AU)

• FAPESP's process: 13/23512-7 - Circuit Quantum Electrodynamics: Bistability and Squeezed States
• Grantee: Daniel Zini Rossatto
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/04162-5 - Development of quantum sensors based on ultracold atoms
• Grantee: Philippe Wilhelm Courteille
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 14/12740-1 - Quantum memory and cavity electrodynamics in quantum dots coupled by tunneling
• Grantee: Halyne Silva Borges
• Support Opportunities: Scholarships in Brazil - Post-Doctoral