ORCID Profile
0000-0002-8892-9425
Current Organisations
UNSW
,
Southern University of Science and Technology
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Publisher: American Physical Society (APS)
Date: 21-08-2019
Publisher: Wiley
Date: 23-08-2020
Publisher: Springer Science and Business Media LLC
Date: 04-05-2015
Abstract: Single quantum emitters (SQEs) are at the heart of quantum optics and photonic quantum-information technologies. To date, all the demonstrated solid-state single-photon sources are confined to one-dimensional (1D ref. 3) or 3D materials. Here, we report a new class of SQEs based on excitons that are spatially localized by defects in 2D tungsten-diselenide (WSe2) monolayers. The optical emission from these SQEs shows narrow linewidths of ∼130 μeV, about two orders of magnitude smaller than those of delocalized valley excitons. Second-order correlation measurements revealed a strong photon antibunching, which unambiguously established the single-photon nature of the emission. The SQE emission shows two non-degenerate transitions, which are cross-linearly polarized. We assign this fine structure to two excitonic eigenmodes whose degeneracy is lifted by a large ∼0.71 meV coupling, probably because of the electron-hole exchange interaction in the presence of anisotropy. Magneto-optical measurements also reveal an exciton g factor of ∼8.7, several times larger than those of delocalized valley excitons. In addition to their fundamental importance, establishing new SQEs in 2D quantum materials could give rise to practical advantages in quantum-information processing, such as an efficient photon extraction and a high integratability and scalability.
Publisher: Springer Science and Business Media LLC
Date: 05-2017
Publisher: Springer Science and Business Media LLC
Date: 30-08-2016
Publisher: American Physical Society (APS)
Date: 22-09-2017
Publisher: American Physical Society (APS)
Date: 10-05-2017
Publisher: American Physical Society (APS)
Date: 08-08-2017
Publisher: IOP Publishing
Date: 06-2019
Abstract: Determination of qubit initialisation and measurement fidelity is important for the overall performance of a quantum computer. However, the method by which it is calculated in semiconductor qubits varies between experiments. In this paper we present a full theoretical analysis of electronic single-shot readout and describe critical parameters to achieve high fidelity readout. In particular, we derive a model for energy selective state readout based on a charge detector response and examine how to optimise the fidelity by choosing correct experimental parameters. Although we focus on single electron spin readout, the theory presented can be applied to other electronic readout techniques in semiconductors that use a reservoir.
Publisher: American Physical Society (APS)
Date: 06-09-2018
Publisher: American Physical Society (APS)
Date: 14-01-2016
Publisher: American Chemical Society (ACS)
Date: 30-10-2014
DOI: 10.1021/NL503081N
Abstract: Single photons are attractive candidates of quantum bits (qubits) for quantum computation and are the best messengers in quantum networks. Future scalable, fault-tolerant photonic quantum technologies demand both stringently high levels of photon indistinguishability and generation efficiency. Here, we demonstrate deterministic and robust generation of pulsed resonance fluorescence single photons from a single semiconductor quantum dot using adiabatic rapid passage, a method robust against fluctuation of driving pulse area and dipole moments of solid-state emitters. The emitted photons are background-free, have a vanishing two-photon emission probability of 0.3% and a raw (corrected) two-photon Hong-Ou-Mandel interference visibility of 97.9% (99.5%), reaching a precision that places single photons at the threshold for fault-tolerant surface-code quantum computing. This single-photon source can be readily scaled up to multiphoton entanglement and used for quantum metrology, boson s ling, and linear optical quantum computing.
Publisher: American Physical Society (APS)
Date: 27-05-2016
Publisher: Science China Press., Co. Ltd.
Date: 03-2014
Publisher: Springer Science and Business Media LLC
Date: 03-02-2013
Abstract: Single-photon sources based on semiconductor quantum dots offer distinct advantages for quantum information, including a scalable solid-state platform, ultrabrightness and interconnectivity with matter qubits. A key prerequisite for their use in optical quantum computing and solid-state networks is a high level of efficiency and indistinguishability. Pulsed resonance fluorescence has been anticipated as the optimum condition for the deterministic generation of high-quality photons with vanishing effects of dephasing. Here, we generate pulsed single photons on demand from a single, microcavity-embedded quantum dot under s-shell excitation with 3 ps laser pulses. The π pulse-excited resonance-fluorescence photons have less than 0.3% background contribution and a vanishing two-photon emission probability. Non-postselective Hong-Ou-Mandel interference between two successively emitted photons is observed with a visibility of 0.97(2), comparable to trapped atoms and ions. Two single photons are further used to implement a high-fidelity quantum controlled-NOT gate.
Publisher: American Physical Society (APS)
Date: 04-03-2015
Publisher: Springer Science and Business Media LLC
Date: 11-09-2011
Publisher: American Physical Society (APS)
Date: 31-01-2014
Publisher: American Physical Society (APS)
Date: 04-12-2013
Publisher: Springer Science and Business Media LLC
Date: 17-07-2019
DOI: 10.1038/S41586-019-1381-2
Abstract: Electron spin qubits formed by atoms in silicon have large (tens of millielectronvolts) orbital energies and weak spin-orbit coupling, giving rise to isolated electron spin ground states with coherence times of seconds
No related grants have been discovered for Yu He.