Control of conditional quantum beats in cavity QED: amplitude decoherence and phase shifts

A. D. Cimmarusti (1) , C. A. Schroeder (1) , B. D. Patterson (1) , L. A. Orozco (1) , P. Barberis-Blostein (2) , H. J. Carmichael (3) ((1) Joint Quantum Institute , Department of Physics , University of Maryland

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National Institute of Standards Technology College Park MD USA (2) Instituto de Investigaci\'on en Matem\'aticas Aplicadas y en Sistemas Universidad Nacional Aut\'onoma de M\'exico M\'exico (3) Department of Physics University of Auckland New Zealand)

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classification 🪐 quant-ph

keywords drivequantumamplitudebeatscavitydecoherencelarmorphase

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We implement a simple feedback mechanism on a two-mode cavity QED system to preserve the Zeeman coherence of a ground state superposition that generates quantum beats on the second-order correlation function. Our investigation includes theoretical and experimental studies that show how to prevent a shift away from the Larmor frequency and associated decoherence caused by Rayleigh scattering. The protocol consists of turning off the drive of the system after the detection of a first photon and letting it evolve in the dark. Turning the drive back on after a pre-set time reveals a phase accumulated only from Larmor precession, with the amplitude of the quantum beat more than a factor of two larger than with continuous drive.

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Control of conditional quantum beats in cavity QED: amplitude decoherence and phase shifts

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