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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Quantum PHASE gate based on electromagnetically induced transparency in optical cavities

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Autor(es):
Borges, Halyne S. ; Villas-Boas, Celso J.
Número total de Autores: 2
Tipo de documento: Artigo Científico
Fonte: Physical Review A; v. 94, n. 5 NOV 30 2016.
Citações Web of Science: 12
Resumo

We theoretically investigate the implementation of a quantum controlled-PHASE gate in a system constituted by a single atom inside an optical cavity, based on the electromagnetically induced transparency effect. First we show that a probe pulse can experience a pi phase shift due to the presence or absence of a classical control field. Considering the interplay of the cavity-EIT effect and the quantum memory process, we demonstrated a controlled-PHASE gate between two single photons. To this end, first one needs to store a (control) photon in the ground atomic states. In the following, a second (target) photon must impinge on the atom-cavity system. Depending on the atomic state, this second photon will be either transmitted or reflected, acquiring different phase shifts. This protocol can then be easily extended to multiphoton systems, i.e., keeping the control photon stored, it may induce phase shifts in several single photons, thus enabling the generation of multipartite entangled states. We explore the relevant parameter space in the atom-cavity system that allows the implementation of quantum controlled-PHASE gates using the recent technologies. In particular, we have found a lower bound for the cooperativity of the atom-cavity system which enables the implementation of phase shift on single photons. The induced shift on the phase of a photonic qubit and the controlled-PHASE gate between single photons, combined with optical devices, enable one to perform universal quantum computation. (AU)

Processo FAPESP: 13/04162-5 - Desenvolvimento de sensores quânticos com átomos ultrafrios
Beneficiário:Philippe Wilhelm Courteille
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 12/00176-9 - Dinâmica de sistemas quânticos abertos: transição quântico-clássico e transparência eletromagneticamente induzida em cavidades ópticas
Beneficiário:Celso Jorge Villas-Bôas
Linha de fomento: Auxílio à Pesquisa - Regular
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