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5 March 2019 Photon echo generation using chirped pulses in quantum dots (Conference Presentation)
Masanari Watanabe, Naoto Aonuma, Kouichi Akahane, Junko Ishi-Hayase
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Proceedings Volume 10916, Ultrafast Phenomena and Nanophotonics XXIII; 109160G (2019) https://doi.org/10.1117/12.2508198
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
In quantum information technology, it is necessary to develop a light-matter quantum interface that transfers and stores quantum information. As a bandwidth of quantum entangled photon pairs used for quantum information increases, a quantum interface with broad bandwidth will be required. The combination of quantum dot (QD) ensemble and photon echo (PE) method is one of promising methods for broadband quantum interface. Since the bandwidth of the quantum interface using this method is limited only by the inhomogeneous width of the QDs, it is possible to implement a quantum interface with the bandwidth of 10 THz at telecommunication wavelength. However, in the PE method, the spatial inhomogeneousity of the laser intensity and the inhomogeneousity of the resonance frequency of the QDs result in the uniform quantum control of excitons in QDs. As a result, the regeneration efficiency of the PE light is significantly deteriorated. To solve this problem, it is effective to introduce a quantum control method using chirped pulses (Adaptive Rapid Passages; ARPs) which is robust to inhomogeneousities. In this study, we demonstrate that the regeneration efficiency of PE in inhomogeneous QDs can be improved by ARPs using femtosecond pulses. By performing numerical simulation and optical experiments, it was found that the regeneration efficiency improves as the chirp amount and the pulse area increase, and saturates at a certain condition.
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Masanari Watanabe, Naoto Aonuma, Kouichi Akahane, and Junko Ishi-Hayase "Photon echo generation using chirped pulses in quantum dots (Conference Presentation)", Proc. SPIE 10916, Ultrafast Phenomena and Nanophotonics XXIII, 109160G (5 March 2019); https://doi.org/10.1117/12.2508198
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KEYWORDS
Quantum information
Interfaces
Quantum dots
Excitons
Femtosecond phenomena
Information technology
Numerical simulations
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