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Enhancement of Photon Echo Signal from Strain Compensated Quantum Dots Embedded in Optical Resonator

Ryutaro Ide

The International Commission for OpticsMay 16, 20170 citations

Heterodyne-detected accumulated photon echo in CdSe quantum dots

K Takemoto, Byung‐Ryool Hyun, Yasuaki Masumoto

Solid State CommunicationsMay 1, 200024 citations

Coherent Transfer and Retrieval of Picosecond Single Photon Pulses to a Quantum Dot Ensemble in the Telecommunication Wavelengtn Range

Kazumasa Suzuki

The Japan Society of Applied PhysicsFeb 13, 20130 citations

Transfer and retrieval of telecom-wavelength picoseconds single-photon qubits to quantum dots

Kazumasa Suzuki, Koichiro Konishi, Kouichi Akahane +1 more

電子情報通信学会技術研究報告. LQE, レーザ・量子エレクトロニクスMay 10, 20130 citations

Ultrafast Nonlinear Spectroscopy of Strain-compensated Quantum Dots

Junko Ishi‐Hayase

We investigate the dephasing mechanism of optically-induced exciton coherence in an ensemble of InAs self-assembled quantum dots (QDs) using a two-pulse photon-echo (PE) technique. The sample was fabricated on an InP (311)B substrate using strain compensation to control the emission wavelength. This technique also enabled us to fabricate a 150-layer stacked QD structure for enhancing the PE signal intensity. We show the measured decay time of PE signal intensity for resonant excitation of ground-state transition is extremely long, which corresponds to ultralong coherence times of excitons in our QDs. We confirmed that non-radiative population relaxation and pure dephasing are considerably smaller than the radiative relaxation at low temperature. Furthermore, we demonstrate the ultrafast coherent control of QD exciton polarization by changing the pulse areas (Rabi oscillations) in the PE experiment. We also propose a new scheme for implementing QD quantum memory by using the PE technique.We investigate the dephasing mechanism of optically-induced exciton coherence in an ensemble of InAs self-assembled quantum dots (QDs) using a two-pulse photon-echo (PE) technique. The sample was fabricated on an InP (311)B substrate using strain compensation to control the emission wavelength. This technique also enabled us to fabricate a 150-layer stacked QD structure for enhancing the PE signal intensity. We show the measured decay time of PE signal intensity for resonant excitation of ground-state transition is extremely long, which corresponds to ultralong coherence times of excitons in our QDs. We confirmed that non-radiative population relaxation and pure dephasing are considerably smaller than the radiative relaxation at low temperature. Furthermore, we demonstrate the ultrafast coherent control of QD exciton polarization by changing the pulse areas (Rabi oscillations) in the PE experiment. We also propose a new scheme for implementing QD quantum memory by using the PE technique.

Hyomen KagakuJan 1, 20110 citations

Coherent Transfer and Retrieval of Terahertz-bandwidth Single Photon Pulses to a Quantum Dot Ensemble at Telecommunication Wavelengths

Kazumasa Suzuki, Kouichi Akahane, Junko Ishi‐Hayase

We demonstrate the coherent transfer and on-demand retrieval of quantum state of telecom-wavelength ultrabroadband single photon pulse (terahertz range) to a collective excitation of a large number of quantum dots using photon-echo technique. The large inhomogeneous broadening of exciton energies in quantum dots, in conjunction with photon-echo technique, enables us to increase the acceptable spectral bandwidth of transferred single photon pulse from the current maximum of 5 gigahertz to 1 terahertz.We demonstrate the coherent transfer and on-demand retrieval of quantum state of telecom-wavelength ultrabroadband single photon pulse (terahertz range) to a collective excitation of a large number of quantum dots using photon-echo technique. The large inhomogeneous broadening of exciton energies in quantum dots, in conjunction with photon-echo technique, enables us to increase the acceptable spectral bandwidth of transferred single photon pulse from the current maximum of 5 gigahertz to 1 terahertz.

Jan 1, 20130 citations

Transfer and retrieval of optical coherence to strain-compensated quantum dots using a heterodyne photon-echo technique

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Transfer and retrieval of optical coherence to strain-compensated quantum dots using a heterodyne photon-echo technique

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