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

IEEE Photonics Conference

Quantum Interference of Identical Photons from Remote GaAs Quantum Dots

Alisa Javadi, Giang N. Nguyen, L. Zhai, Clemens Spinnler, Julian Ritzmann, Matthias C. Löbl, Andreas Dirk Wieck, Arne Ludwig, Richard John Warburton

Published Nov 12, 2023• 3 citations
Publisher

Abstract

We present near-unity two-photon interference visibilities for single-photon states generated from two separate GaAs quantum dots. This level of interference visibility is the first of its kind among solid-state quantum emitters and matches the performance of pure platforms such as atoms and ions.
DOI
10.1109/ipc57732.2023.10360579

Related papers

Quantum interference of identical photons from remote GaAs quantum dots

Alisa Javadi, Giang N. Nguyen, Liang Zhai +6 more

Efficient generation and detection of coherent single photons are key to advances in photonic quantum technologies such as quantum computation, quantum simulation, and quantum communication. Among many quantum emitters, semiconductor quantum dots are promising due to their deterministic and high-rate single-photon emission and the possibility of integration into nanostructures. However, poor quantum coherence between single photons created by independent emitters poses a major roadblock. Here, we present near-unity two-photon interference visibilities from two separate GaAs quantum dots. This high visibility (~93%) is achieved under rigorous conditions: there is no Purcell enhancement, no temporal post-selection, no narrow spectral filtering, nor frequency stabilization. One key component is the heterostructure, an n-i-p diode using material of excellent quality. The quantum dot charge is locked via Coulomb blockade; within a charging plateau, the exact emission frequency can be tuned via the bias applied to the gate; the charge noise is very low. A second key component is the quantum dot itself: the relatively large size confers multiple benefits. Our results suggest that GaAs quantum dots represent a versatile choice for generating identical photons from multiple emitters.

Photonics for Quantum (PfQ)•Jul 19, 2023•0 citations

Resonance fluorescence of GaAs quantum dots with near-unity photon indistinguishability (Conference Presentation)

Lukas Hanschke, Eva Schöll, Lucas Schweickert +10 more

We investigate the indistinguishability of single photons generated from strain-free GaAs/AlGaAs quantum dots using pulsed resonance fluorescence techniques. In pulsed two-photon interference measurements we observe a single photon indistinguishability with a raw visibility of 95%. This can be traced back to the short intrinsic lifetime of excitons and trions confined in the GaAs quantum dots and demonstrates that for this material system the generation of single photons is possible with near-unity indistinguishability even without Purcell enhancement.

Ultrafast Phenomena and Nanophotonics•Mar 17, 2020•1 citation

Resonance fluorescence of GaAs quantum dots with near-unity photon indistinguishability

Lukas Hanschke, Eva Schöll, Lucas Schweickert +10 more

We investigate the indistinguishability of single photons generated from strain-free GaAs/AlGaAs quantum dots using pulsed resonance fluorescence techniques. In pulsed two-photon interference measurements we observe a single photon indistinguishability with a raw visibility of 95%. This can be traced back to the short intrinsic lifetime of excitons and trions confined in the GaAs quantum dots and demonstrates that for this material system the generation of single photons is possible with near-unity indistinguishability even without Purcell enhancement.

Quantum Nanophotonic Materials, Devices, and Systems•Aug 20, 2020•3 citations

Two-photon interference using electrically tunable remote quantum dots

Raj B. Patel, Anthony J. Bennett, Ian A. Farrer +3 more

One of the criteria for the physical implementation of quantum computing is that it must be possible to manipulate individual qubits to prepare them in the same well-defined state. In schemes involving linear optics and single photons from self-assembled quantum dots, this requirement can be intractable as quantum dots form with a distribution of emission energies. We have designed a structure based on InAs quantum dots embedded at the center of an AlGaAs/GaAs/AlGaAs quantum well which facilitates carrier confinement under application of electric fields up to |F| = 500 kVcm -1. This is an order of magnitude greater than previous reports. Through the quantum-confined Stark effect, individual dots can be tuned by up to 25meV, three orders of magnitude greater than their linewidth. This unprecedented tuning range allows many quantum dots to be tuned to the same energy with ease, enabling us to carry out two-photon interference measurements using remote quantum dots. Furthermore, we demonstrate scalability by performing the interference experiment with three pairs of quantum dots. By post-selecting events where two photons arrive simultaneously at a beamsplitter, we find that the interference visibility is limited only by the timing resolution of our system. We also performed measurements as a function of energy detuning which showed that maximum visibility can only be achieved when the dots are degenerate in energy. This opens up the possibility of transferring quantum information between remote solid-state systems.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Feb 10, 2011•0 citations

Indistinguishability of single photons from dissimilar single-photon sources

Sergey V. Polyakov, Edward B. Flagg, Andreas Müller +2 more

In quantum mechanics, particles in identical states are indistinguishable, giving rise to effects with no classical analog. For instance, the bosonic nature of light insures that upon interference two indistinguishable photons will coalesce into a single inseparable state. Through this coalescence, we demonstrate that photons produced from two separate quantum dots are indistinguishable. Further, we show that single photons created in a fundamentally different process - parametric down-conversion in a nonlinear crystal - can be manipulated to be indistinguishable from those from quantum dots. The quantum interference in both experiments occurs with a visibility reduced from unity because the quantum dot photons are not lifetime-limited due to the presence of pure dephasing. The measured visibility closely matches the theoretical visibility predicted for photons with the parameters of those measured here.

AIP conference proceedings•Jan 1, 2012•0 citations

Quantum Interference of Identical Photons from Remote Quantum Dots

Liang Zhai, Giang N. Nguyen, Clemens Spinnler +6 more

Photonic quantum technology provides a viable route to quantum communication, quantum simulation, and quantum information processing. Recent progress has seen the realisation of boson sampling using 20 single-photons and quantum key distribution over hundreds of kilometres. Scaling the complexity requires photonic architectures containing a large number of single photons, multiple photon-sources and photon-counters. Semiconductor quantum dots are bright and fast sources of coherent single-photons. For applications, a significant roadblock is the poor quantum coherence upon interfering single photons created by independent quantum dots. Here, we demonstrate two-photon interference with near-unity visibility using photons from remote quantum dots. Exploiting the quantum interference, we demonstrate a photonic controlled-not circuit and a high-fidelity entanglement between photons of different origins. Our results provide a long-awaited solution to the challenge of creating coherent single-photons in a scalable way. In the near future, they point to a demonstration of quantum advantage using quantum-dot single photons and an implementation of device-independent quantum key distribution.

•Jun 7, 2021•8 citations
Efficient generation and detection of coherent single photons are key to advances in photonic quantum technologies such as quantum computation, quantum simulation, and quantum communication. Among many quantum emitters, semiconductor quantum dots are promising due to their deterministic and high-rate single-photon emission and the possibility of integration into nanostructures. However, poor quantum coherence between single photons created by independent emitters poses a major roadblock. Here, we present near-unity two-photon interference visibilities from two separate GaAs quantum dots. This high visibility (~93%) is achieved under rigorous conditions: there is no Purcell enhancement, no temporal post-selection, no narrow spectral filtering, nor frequency stabilization. One key component is the heterostructure, an n-i-p diode using material of excellent quality. The quantum dot charge is locked via Coulomb blockade; within a charging plateau, the exact emission frequency can be tuned via the bias applied to the gate; the charge noise is very low. A second key component is the quantum dot itself: the relatively large size confers multiple benefits. Our results suggest that GaAs quantum dots represent a versatile choice for generating identical photons from multiple emitters.
We investigate the indistinguishability of single photons generated from strain-free GaAs/AlGaAs quantum dots using pulsed resonance fluorescence techniques. In pulsed two-photon interference measurements we observe a single photon indistinguishability with a raw visibility of 95%. This can be traced back to the short intrinsic lifetime of excitons and trions confined in the GaAs quantum dots and demonstrates that for this material system the generation of single photons is possible with near-unity indistinguishability even without Purcell enhancement.
We investigate the indistinguishability of single photons generated from strain-free GaAs/AlGaAs quantum dots using pulsed resonance fluorescence techniques. In pulsed two-photon interference measurements we observe a single photon indistinguishability with a raw visibility of 95%. This can be traced back to the short intrinsic lifetime of excitons and trions confined in the GaAs quantum dots and demonstrates that for this material system the generation of single photons is possible with near-unity indistinguishability even without Purcell enhancement.
One of the criteria for the physical implementation of quantum computing is that it must be possible to manipulate individual qubits to prepare them in the same well-defined state. In schemes involving linear optics and single photons from self-assembled quantum dots, this requirement can be intractable as quantum dots form with a distribution of emission energies. We have designed a structure based on InAs quantum dots embedded at the center of an AlGaAs/GaAs/AlGaAs quantum well which facilitates carrier confinement under application of electric fields up to |F| = 500 kVcm -1. This is an order of magnitude greater than previous reports. Through the quantum-confined Stark effect, individual dots can be tuned by up to 25meV, three orders of magnitude greater than their linewidth. This unprecedented tuning range allows many quantum dots to be tuned to the same energy with ease, enabling us to carry out two-photon interference measurements using remote quantum dots. Furthermore, we demonstrate scalability by performing the interference experiment with three pairs of quantum dots. By post-selecting events where two photons arrive simultaneously at a beamsplitter, we find that the interference visibility is limited only by the timing resolution of our system. We also performed measurements as a function of energy detuning which showed that maximum visibility can only be achieved when the dots are degenerate in energy. This opens up the possibility of transferring quantum information between remote solid-state systems.
In quantum mechanics, particles in identical states are indistinguishable, giving rise to effects with no classical analog. For instance, the bosonic nature of light insures that upon interference two indistinguishable photons will coalesce into a single inseparable state. Through this coalescence, we demonstrate that photons produced from two separate quantum dots are indistinguishable. Further, we show that single photons created in a fundamentally different process - parametric down-conversion in a nonlinear crystal - can be manipulated to be indistinguishable from those from quantum dots. The quantum interference in both experiments occurs with a visibility reduced from unity because the quantum dot photons are not lifetime-limited due to the presence of pure dephasing. The measured visibility closely matches the theoretical visibility predicted for photons with the parameters of those measured here.
Photonic quantum technology provides a viable route to quantum communication, quantum simulation, and quantum information processing. Recent progress has seen the realisation of boson sampling using 20 single-photons and quantum key distribution over hundreds of kilometres. Scaling the complexity requires photonic architectures containing a large number of single photons, multiple photon-sources and photon-counters. Semiconductor quantum dots are bright and fast sources of coherent single-photons. For applications, a significant roadblock is the poor quantum coherence upon interfering single photons created by independent quantum dots. Here, we demonstrate two-photon interference with near-unity visibility using photons from remote quantum dots. Exploiting the quantum interference, we demonstrate a photonic controlled-not circuit and a high-fidelity entanglement between photons of different origins. Our results provide a long-awaited solution to the challenge of creating coherent single-photons in a scalable way. In the near future, they point to a demonstration of quantum advantage using quantum-dot single photons and an implementation of device-independent quantum key distribution.