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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.)

Continuous quantum light from a dark atom

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Tolazzi, Karl Nicolas [1] ; Wang, Bo [1] ; Ianzano, Christopher [1] ; Neumeier, Jonas [1] ; Villas-Boas, Celso Jorge [2] ; Rempe, Gerhard [1]
Total Authors: 6
[1] Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, Garching - Germany
[2] Univ Fed Sao Carlos, Dept Fis, Sao Carlos - Brazil
Total Affiliations: 2
Document type: Journal article
Source: COMMUNICATIONS PHYSICS; v. 4, n. 1 MAR 23 2021.
Web of Science Citations: 1

Cycling processes are important in many areas of physics ranging from lasers to topological insulators, often offering surprising insights into dynamical and structural aspects of the respective system. Here we report on a quantum-nonlinear wave-mixing experiment where resonant lasers and an optical cavity define a closed cycle between several ground and excited states of a single atom. We show that, for strong atom-cavity coupling and steady-state driving, the entanglement between the atomic states and intracavity photon number suppresses the excited-state population via quantum interference, effectively reducing the cycle to the atomic ground states. The system dynamics then result from transitions within a harmonic ladder of entangled dark states, one for each cavity photon number, and a quantum Zeno blockade that generates antibunching in the photons emitted from the cavity. The reduced cycle suppresses unwanted optical pumping into atomic states outside the cycle, thereby enhancing the number of emitted photons. The ability of optically dark states to protect against decoherence makes them useful for the generation of entangled photons. Here, a continuous stream of single photons is generated by a controllable quantum Zeno effect between entangled atom-photon states. (AU)

FAPESP's process: 18/22402-7 - Nonlinear effects in two-mode cavity QED systems
Grantee:Celso Jorge Villas-Bôas
Support Opportunities: Regular Research Grants