Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review Letters

Single-Shot Detection of Electrons Generated by Individual Photons in a Tunable Lateral Quantum Dot

Alessandro Pioda, E. Totoki, Haruki Kiyama, T. Fujita, Giles Allison, T. Asayama, A. Oiwa, Seigo Tarucha

Published Apr 8, 2011• 25 citations
Publisher

Abstract

We demonstrate single-shot detection of single electrons generated by single photons using an electrically tunable quantum dot and a quantum point contact charge detector. By tuning the quantum dot in a Coulomb blockade before the photoexcitation, we observe the trapping and subsequent resetting of single photogenerated electrons. The photogenerated electrons can be stored in the dot for a tunable time range from shorter to longer than the spin-flip time T1. We combine this trap-reset technique with spin-dependent tunneling under magnetic fields to observe the spin-dependent photon detection within the T1.

DOI
10.1103/physrevlett.106.146804

Related papers

Single photo-electron trapping, storage, and detection in a one-electron quantum dot

Rao, D S, Szkopek, T, Hans D. Robinson +2 more

There has been considerable progress in electro-statically emptying, and re-filling, quantum dots with individual electrons. Typically the quantum dot is defined by electrostatic gates on a GaAs/AlGaAs modulation doped heterostructure. We report the filling of such a quantum dot by a single photo-electron, originating from an individual photon. The electrostatic dot can be emptied and reset in a controlled fashion before the arrival of each photon. The trapped photo-electron is detected by a point contact transistor integrated adjacent to the electrostatic potential trap. Each stored photo-electron causes a persistent negative step in the transistor channel current. Such a controllable, benign, single photo-electron detector could allow for information transfer between flying photon qubits and stored electron qubits.

•Oct 13, 2004•20 citations

Single photoelectron trapping, storage, and detection in a one-electron quantum dot

Deepak Sethu Rao, Thomas Szkopek, Hans D. Robinson +2 more

There has been considerable progress in electrostatically emptying, and refilling, quantum dots with individual electrons. Typically the quantum dot is defined by electrostatic gates on a GaAs∕AlyGa1−yAs modulation-doped heterostructure. We report the filling of such a quantum dot by a single photoelectron, originating from an individual photon. The electrostatic dot can be emptied and reset in a controlled fashion before the arrival of each photon. The trapped photoelectron is detected by a point contact transistor integrated adjacent to the electrostatic potential trap. Each stored photoelectron causes a persistent negative step in the transistor channel current. Such a controllable, benign, single photoelectron detector could allow for information transfer between flying photon qubits and stored electron qubits.

arXiv:quant-ph/0410094•Journal of Applied Physics•Dec 1, 2005•19 citations

Photogeneration of a single electron from a single Zeeman-resolved light-hole exciton with preserved angular momentum

Kazuyuki Kuroyama, M. Larsson, C. Y. Chang +10 more

Quantum state transfer from a single photon to a single electron following selection rules can only occur for a spin-resolved light-hole excitation in GaAs quantum dots; however, these phenomena have yet to be experimentally realized. Here, we report on single-shot readout of a single electron spin via the Zeeman-resolved light-hole excitation using an optical spin blockade method in a GaAs quantum dot and a Pauli spin blockade method in a double GaAs quantum dot. The observed photoexcitation probability strongly depends on the photon polarization, an indication of angular momentum transfer from a single photon to an electron. Our demonstration will open a pathway to further investigation of fundamental quantum physics and applications of quantum networking technology.

arXiv:1805.05147•Physical review. B./Physical review. B•Feb 7, 2019•19 citations

Frequency-Selective Single-Photon Detection Using a Double Quantum Dot

Simon Gustavsson, M. Studer, Renaud Leturcq +4 more

We use a double quantum dot as a frequency-tunable on-chip microwave detector to investigate the radiation from electron shot-noise in a near-by quantum point contact. The device is realized by monitoring the inelastic tunneling of electrons between the quantum dots due to photon absorption. The frequency of the absorbed radiation is set by the energy separation between the dots, which is easily tuned with gate voltages. Using time-resolved charge-detection techniques, we can directly relate the detection of a tunneling electron to the absorption of a single photon.

arXiv:0705.3166•Physical Review Letters•Nov 14, 2007•170 citations

Angular momentum transfer from photon polarization to an electron spin in a gate-defined quantum dot

Takafumi Fujita, Kazuhiro Morimoto, Haruki Kiyama +7 more

Gate-defined quantum dots (QDs) are such a highly-tunable quantum system in which single spins can be electrically coupled, manipulated, and measured. However, the spins in gate-defined QDs are lacking its interface to free-space photons. Here, we verify that a circularly-polarized single photon can excite a single electron spin via the transfer of angular momentum, measured using Pauli spin blockade (PSB) in a double QD. We monitor the inter-dot charge tunneling which only occur when the photo-electron spin in one QD is anti-parallel to the electron spin in the other. This allows us to detect single photo-electrons in the spin-up/down basis using PSB. The photon polarization dependence of the excited spin state was finally confirmed for the heavy-hole exciton excitation. The angular momentum transfer observed here is a fundamental step providing a route to instant injection of spins, distributing single spin information, and possibly towards extending quantum communication.

arXiv:1504.03696•Nature Communications•Jul 16, 2019•52 citations

Detection of Angular Momentum Transfer from a Single Photon to a Single Electron Spin in a Lateral Double Quantum Dot

高史 藤田

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.

•Mar 24, 2014•0 citations
We demonstrate single-shot detection of single electrons generated by single photons using an electrically tunable quantum dot and a quantum point contact charge detector. By tuning the quantum dot in a Coulomb blockade before the photoexcitation, we observe the trapping and subsequent resetting of single photogenerated electrons. The photogenerated electrons can be stored in the dot for a tunable time range from shorter to longer than the spin-flip time T1. We combine this trap-reset technique with spin-dependent tunneling under magnetic fields to observe the spin-dependent photon detection within the T1.
There has been considerable progress in electro-statically emptying, and re-filling, quantum dots with individual electrons. Typically the quantum dot is defined by electrostatic gates on a GaAs/AlGaAs modulation doped heterostructure. We report the filling of such a quantum dot by a single photo-electron, originating from an individual photon. The electrostatic dot can be emptied and reset in a controlled fashion before the arrival of each photon. The trapped photo-electron is detected by a point contact transistor integrated adjacent to the electrostatic potential trap. Each stored photo-electron causes a persistent negative step in the transistor channel current. Such a controllable, benign, single photo-electron detector could allow for information transfer between flying photon qubits and stored electron qubits.
There has been considerable progress in electrostatically emptying, and refilling, quantum dots with individual electrons. Typically the quantum dot is defined by electrostatic gates on a GaAs∕AlyGa1−yAs modulation-doped heterostructure. We report the filling of such a quantum dot by a single photoelectron, originating from an individual photon. The electrostatic dot can be emptied and reset in a controlled fashion before the arrival of each photon. The trapped photoelectron is detected by a point contact transistor integrated adjacent to the electrostatic potential trap. Each stored photoelectron causes a persistent negative step in the transistor channel current. Such a controllable, benign, single photoelectron detector could allow for information transfer between flying photon qubits and stored electron qubits.
Quantum state transfer from a single photon to a single electron following selection rules can only occur for a spin-resolved light-hole excitation in GaAs quantum dots; however, these phenomena have yet to be experimentally realized. Here, we report on single-shot readout of a single electron spin via the Zeeman-resolved light-hole excitation using an optical spin blockade method in a GaAs quantum dot and a Pauli spin blockade method in a double GaAs quantum dot. The observed photoexcitation probability strongly depends on the photon polarization, an indication of angular momentum transfer from a single photon to an electron. Our demonstration will open a pathway to further investigation of fundamental quantum physics and applications of quantum networking technology.
We use a double quantum dot as a frequency-tunable on-chip microwave detector to investigate the radiation from electron shot-noise in a near-by quantum point contact. The device is realized by monitoring the inelastic tunneling of electrons between the quantum dots due to photon absorption. The frequency of the absorbed radiation is set by the energy separation between the dots, which is easily tuned with gate voltages. Using time-resolved charge-detection techniques, we can directly relate the detection of a tunneling electron to the absorption of a single photon.
Gate-defined quantum dots (QDs) are such a highly-tunable quantum system in which single spins can be electrically coupled, manipulated, and measured. However, the spins in gate-defined QDs are lacking its interface to free-space photons. Here, we verify that a circularly-polarized single photon can excite a single electron spin via the transfer of angular momentum, measured using Pauli spin blockade (PSB) in a double QD. We monitor the inter-dot charge tunneling which only occur when the photo-electron spin in one QD is anti-parallel to the electron spin in the other. This allows us to detect single photo-electrons in the spin-up/down basis using PSB. The photon polarization dependence of the excited spin state was finally confirmed for the heavy-hole exciton excitation. The angular momentum transfer observed here is a fundamental step providing a route to instant injection of spins, distributing single spin information, and possibly towards extending quantum communication.
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.