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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Quantum PHASE gate based on electromagnetically induced transparency in optical cavities

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Borges, Halyne S. ; Villas-Boas, Celso J.
Total Authors: 2
Document type: Journal article
Source: Physical Review A; v. 94, n. 5 NOV 30 2016.
Web of Science Citations: 12

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)

FAPESP's process: 13/04162-5 - Development of quantum sensors based on ultracold atoms
Grantee:Philippe Wilhelm Courteille
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/00176-9 - Dynamics of open quantum systems: quantum-classical transition and electromagnetically induced transparency in optical cavities
Grantee:Celso Jorge Villas-Bôas
Support type: Regular Research Grants
FAPESP's process: 14/12740-1 - Quantum memory and cavity electrodynamics in quantum dots coupled by tunneling
Grantee:Halyne Silva Borges
Support type: Scholarships in Brazil - Post-Doctorate