Heralded entangling quantum gate via cavity-assisted photon scattering

Autor(es)

Borges, Halyne S. ^[1] ; Rossatto, Daniel Z. ^[1] ; Luiz, Fabricio S. ^[2] ; Villas-Boas, Celso J. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physical Review A; v. 97, n. 1 JAN 18 2018.
• Citações Web of Science: 3

Resumo

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)

• Processo FAPESP: 14/12740-1 - Memória quântica e eletrodinâmica de cavidades em pontos quânticos acoplados por tunelamento
• Beneficiário: Halyne Silva Borges
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/23512-7 - Eletrodinâmica Quântica de Circuitos: Biestabilidade e Estados Comprimidos
• Beneficiário: Daniel Zini Rossatto
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/04162-5 - Desenvolvimento de sensores quânticos com átomos ultrafrios
• Beneficiário: Philippe Wilhelm Courteille
• Linha de fomento: Auxílio à Pesquisa - Temático