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We demonstrate process tomography of coherent state transfer. We estimated process fidelity of the state transfer to be 81% and clarified that the phase-flip error is the major contribution to the fidelity degradation.
The reduction of de Broglie wavelength is one of the fascinating characteristics of multiphoton quantum interference. It will be applicable to, for instance, super-resolution imaging beyond the classical diffraction limit and ultrasensitive phase measurement beyond the standard quantum limit. Thus far, the reduced de Broglie wavelength has been experimentally demonstrated using visible or near infrared...
We demonstrate that the coherence of the electron spin state, which was transferred from the light polarization state, is tomographically measured in a semiconductor quantum well via the light-hole excitons under in-plane magnetic field by the developed tomographic Kerr rotation method.
We studied blue light-induced near-infrared absorption (BLINIRA) and its temperature dependence in ferroelectric crystals, i.e., MgO-doped stoichiometric-LiNbO3, congruent-LiNbO3, MgO-doped stoichiometric-LiTaO3, and stoichiometric-LiTaO3. We found the BLINIRA decreased with the increase of temperature.
We demonstrate that the superposition of light polarization states is coherently transferred to electron spins in a semiconductor quantum well via the light-hole excitons under in-plane magnetic field by using time-resolved Kerr rotation.
We studied blue light-induced near-infrared absorption (BLINIRA) and its temperature dependence in ferroelectric crystals, i.e., MgO-doped stoichiometric-LiNbO3, congruent-LiNbO3, MgO-doped stoichiometric-LiTaO3, and stoichiometric-LiTaO3. We found the BLINIRA decreased with the increase of temperature.
We studied blue light-induced near-infrared absorption (BLINIRA) and its temperature dependence in ferroelectric crystals, i.e., MgO-doped stoichiometric-LiNbO3, congruent-LiNbO3, MgO-doped stoichiometric-LiTaO3, and stoichiometric-LiTaO3. We found the BLINIRA decreased with the increase of temperature.
We demonstrate that the superposition of light polarization states is coherently transferred to electron spins in a semiconductor quantum well via the light-hole excitons under in-plane magnetic field by using time-resolved Kerr rotation.
We have developed a high-efficiency source of cross-polarized photon pairs in a 800-nm band via type-II quasi-phase matched spontaneous parametric down-conversion using periodically poled lithium niobate. We obtained 25,000 coincidence counts sec-1 mW-1 of the photon pairs.
Polarization entanglement of photons provides a superior environment to demonstrate quantum info-communication protocols. Thus far, several methods using parametric down-conversion process have been realized to generate polarization-entangled photon pairs. In this report, we propose a novel method to generate polarization entanglement from spatially correlated photon pairs and demonstrate its experimental...
The purpose of our study is to establish the technique to measure such weak cross-Kerr nonlinearity induced by a single photon in solid states. The experimental set-up is based on a pump-probe measurement.
We have developed a high-efficiency source of cross-polarized photon pairs via type-II quasi-phase matched spontaneous parametric down-conversion using periodically poled lithium niobate (PPLN). The photon pairs are generated from the PPLN in fifth-order quasi-phase matched condition around 800 nm, which matches the wavelength band of efficient Si avalanche photodiodes. We obtained 25,000 coincidence...
Deterministic quantum state transfer from a photonic qubit to an electron spin qubit is crucial for building all semiconductor quantum repeaters. We present the coherent state preparation of electron spins imprinted from the photon polarization.
We propose and demonstrate a novel scheme to generate a polarization entangled state utilizing a spatial correlation effect in parametric down-conversion. We also demonstrate the violation of Bell's inequality.
We present photon-spin quantum-state-transfer (QST) approach. GaAs/AlGaAs-QW with g~0 showed nonlinear B-field dependence of spin precession, suggesting photon-to-nuclei polarization transfer. 2DEG with quantum-point-contact on InGaAs/InP showed telecomwavelength-sensitive quantum transport. Efficient/high-fidelity QST conditions were also found.
We demonstrate photon-spin polarization transfer. g-factor plays a key role in this transfer process. We obtained g~0 in GaAs/AlGaAs system, which showed anomalous phenomena suggesting population transfer from photons to nuclear spins through electron spins.
We have succeeded, for the first time, in observing two-photon excitation of confined biexcitons in CuCl quantum dots. Furthermore, under this novel excitation condition, stable and efficient ultraviolet lasing of the biexcitons has been achieved
Summary form only given. Excitons confined in nanocrystals or quantum dots attract much attention because they have a very long phase relaxation time that opens the way to the artificial coherent control of the excitons. CuCl quantum dot is a typical material in which the translational motion of the exciton is confined. In this paper, we report on the high resolution measurement of the resonant luminescence...
Summary form only given. Recent development of micro-photoluminescence (/spl mu/-PL) spectroscopy has enabled us to observe photoluminescence from a single quantum dot, which has sharp homogeneous linewidth and long coherence time. We report on the /spl mu/-PL spectra of single GaAs/AlGaAs quantum dots grown on a (411)A surface of a GaAs substrate. We have observed sharp luminescence lines originating...
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