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Bulletin of the American Physical Society

Single photon to single electron conversion using a quantum dot

Haruki Kiyama, T. Fujita, T. Asayama, A. Oiwa, Seigo Tarucha

Published Mar 16, 2009• 0 citations
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We demonstrate paired generation of a single photo-electron in a quantum dot and a single photon from a single polarization-entangled photon pair that is generated by spontaneous parametric down conversion. The electron is reated in a GaAs quantum dot via inter-band resonantexcitation by irradiating one of the paired photons on the dot, while the remaining photon is detected by a single photon counter. Because the paired photons are generated simultaneously, the photo-electron and the remaining photon should be observed as a coincident event if the traveling distance is equivalent between them. The coincidence is probabilistic due to the probabilistic generation of the paired photon. We observe the probability of finding the photon with the photo-electron detection substantially higher then that without the photo-electron detection and derive the coincident rate comparable to the emission rate of the original photon pairs.

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The information transfer from a photon to an electron spin in semiconductors is predicted to forward the realization of quantum computation.Gate defined lateral quantum dots is an attractive platform in this sense since the electrical single and two quantum bit (qubit) gate operations have been demonstrated only in this system.However, realization of quantum media conversion is limited up to the single photon to charge conversion due to the large disturbance of electrostatic potentials by the irradiation of light.It is still challenging to achieve high visibility of single-shot photoelectron spin measurements and the detection of angular momentum transfer from a single photon polarization to a single photoelectron spin.This work presents the detection of single photoelectron spins excited by single circularly polarized photons and confirm the optical selection rules associated with the conversion.Double heterostructure GaAs quantum wells (QWs) were prepared to selectively excite electron spins from the discrete heavy and light hole bands.The QWs are also designed to meet the requirement of the coherent transfer scheme.The out of plane electron g-factors were measured from resistively detected electron spin resonance experiments and we determined the well width implying the near zero in-plane electron g-factor.To overcome the disturbance due to light irradiation, a double quantum dot (DQD) was formed on the chosen QW.DQDs are preferable for high visibility detection of spin states using Pauli spin blockade.Additionally, under i Here, I would like to thank them all.

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Ultrafast optical control of individual electron and hole spin qubits: entanglement between a single quantum dot electron spin and a downconverted 1560-nm single photon

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Individual electron and hole quantum dot spin qubits can be coherently manipulated using picosecond modelocked laser pulses; an all-optical spin-echo was implemented that decouples slow environmental changes. While dephasing and decoherence mechanisms for electrons and holes are intrinsically different, similar qualitative results are obtained, except for dynamic nuclear polarization effects that affect the controllability of electrons. In addition, we demonstrate spin-photon entanglement in a charged InAs quantum dot, using an ultrafast downconversion technique that converts a single, spontaneously emitted photon at 900 nm into a 1560 nm photon with picosecond timing resolution. This ultrafast conversion technique allows quantum erasure of which-path frequency information in the spontaneous emission process.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 29, 2013•1 citation
We demonstrate paired generation of a single photo-electron in a quantum dot and a single photon from a single polarization-entangled photon pair that is generated by spontaneous parametric down conversion. The electron is reated in a GaAs quantum dot via inter-band resonantexcitation by irradiating one of the paired photons on the dot, while the remaining photon is detected by a single photon counter. Because the paired photons are generated simultaneously, the photo-electron and the remaining photon should be observed as a coincident event if the traveling distance is equivalent between them. The coincidence is probabilistic due to the probabilistic generation of the paired photon. We observe the probability of finding the photon with the photo-electron detection substantially higher then that without the photo-electron detection and derive the coincident rate comparable to the emission rate of the original photon pairs.
The information transfer from a photon to an electron spin in semiconductors is predicted to forward the realization of quantum computation.Gate defined lateral quantum dots is an attractive platform in this sense since the electrical single and two quantum bit (qubit) gate operations have been demonstrated only in this system.However, realization of quantum media conversion is limited up to the single photon to charge conversion due to the large disturbance of electrostatic potentials by the irradiation of light.It is still challenging to achieve high visibility of single-shot photoelectron spin measurements and the detection of angular momentum transfer from a single photon polarization to a single photoelectron spin.This work presents the detection of single photoelectron spins excited by single circularly polarized photons and confirm the optical selection rules associated with the conversion.Double heterostructure GaAs quantum wells (QWs) were prepared to selectively excite electron spins from the discrete heavy and light hole bands.The QWs are also designed to meet the requirement of the coherent transfer scheme.The out of plane electron g-factors were measured from resistively detected electron spin resonance experiments and we determined the well width implying the near zero in-plane electron g-factor.To overcome the disturbance due to light irradiation, a double quantum dot (DQD) was formed on the chosen QW.DQDs are preferable for high visibility detection of spin states using Pauli spin blockade.Additionally, under i Here, I would like to thank them all.
Individual electron and hole quantum dot spin qubits can be coherently manipulated using picosecond modelocked laser pulses; an all-optical spin-echo was implemented that decouples slow environmental changes. While dephasing and decoherence mechanisms for electrons and holes are intrinsically different, similar qualitative results are obtained, except for dynamic nuclear polarization effects that affect the controllability of electrons. In addition, we demonstrate spin-photon entanglement in a charged InAs quantum dot, using an ultrafast downconversion technique that converts a single, spontaneously emitted photon at 900 nm into a 1560 nm photon with picosecond timing resolution. This ultrafast conversion technique allows quantum erasure of which-path frequency information in the spontaneous emission process.