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Open AccessArticle

Understanding of Collective Atom Phase Control in Modified Photon Echoes for a Near-Perfect Storage Time-Extended Quantum Memory

by 1,2 and 1,*
1
Center for Photon Information Processing, and School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
2
Quantum Optics Laboratory, Department of Physics, COMSATS University, Islamabad 44000, Pakistan
*
Author to whom correspondence should be addressed.
Entropy 2020, 22(8), 900; https://doi.org/10.3390/e22080900
Received: 27 June 2020 / Revised: 12 August 2020 / Accepted: 12 August 2020 / Published: 15 August 2020
(This article belongs to the Special Issue Quantum Information Processing)
A near-perfect storage time-extended photon echo-based quantum memory protocol has been analyzed by solving the Maxwell–Bloch equations for a backward scheme in a three-level system. The backward photon echo scheme is combined with a controlled coherence conversion process via controlled Rabi flopping to a third state, where the control Rabi flopping collectively shifts the phase of the ensemble coherence. The propagation direction of photon echoes is coherently determined by the phase-matching condition between the data (quantum) and the control (classical) pulses. Herein, we discuss the classical controllability of a quantum state for both phase and propagation direction by manipulating the control pulses in both single and double rephasing photon echo schemes of a three-level system. Compared with the well-understood uses of two-level photon echoes, the Maxwell–Bloch equations for a three-level system have a critical limitation regarding the phase change when interacting with an arbitrary control pulse area. View Full-Text
Keywords: quantum memory; photon echoes; coherence control; rephrasing; Maxwell-Bloch quantum memory; photon echoes; coherence control; rephrasing; Maxwell-Bloch
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MDPI and ACS Style

Ullah, R.; Ham, B.S. Understanding of Collective Atom Phase Control in Modified Photon Echoes for a Near-Perfect Storage Time-Extended Quantum Memory. Entropy 2020, 22, 900. https://doi.org/10.3390/e22080900

AMA Style

Ullah R, Ham BS. Understanding of Collective Atom Phase Control in Modified Photon Echoes for a Near-Perfect Storage Time-Extended Quantum Memory. Entropy. 2020; 22(8):900. https://doi.org/10.3390/e22080900

Chicago/Turabian Style

Ullah, Rahmat; Ham, Byoung S. 2020. "Understanding of Collective Atom Phase Control in Modified Photon Echoes for a Near-Perfect Storage Time-Extended Quantum Memory" Entropy 22, no. 8: 900. https://doi.org/10.3390/e22080900

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