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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Enhanced Femtosecond Photon Echo Generation From Inhomogeneous InAs Quantum Dots by Chirped Pulses

Yuta Kochi, Yutaro Kinoshita, Kouichi Akahane, Junko Ishi‐Hayase

Published Aug 4, 2024• 0 citations
Publisher

Abstract

We succeeded in enhancing photon echo generation efficiency from InAs quantum dots with a large inhomogeneous broadening by a factor of 3.2 using chirped pulses due to the robust quantum control. © 2024 The Author(s) OCIS codes: 160.6000, 210.4680.
DOI
10.1109/cleo-pr60912.2024.10676602

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We developed a THz bandwidth quantum memory using a photon echo technique in InAs quantum dot ensemble with a large inhomogeneous broadning. To improve photon echo generation efficiency, we applied Adiabatic Rapid Passage (ARP) technique to quantum manipulation of quantum memory. In addition, we developed pulse pumped up conversion single photon detector (UCSPD) which enables us to achieve the femtosecond scale temporal resolution and we successfully demonstrated femtosecond time bin photon echo signals.
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.