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An entangled-light-emitting diode.

C L Salter1, R M Stevenson, I Farrer

  • 1Toshiba Research Europe Limited, 208 Cambridge Science Park, Cambridge CB4 0GZ, UK.

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Summary
This summary is machine-generated.

Researchers developed an electrically driven source of entangled photon pairs using a quantum dot in a light-emitting diode (LED). This on-demand entangled photon source is crucial for scalable quantum information applications.

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Area of Science:

  • Quantum Information Science
  • Optoelectronics
  • Solid-State Physics

Background:

  • Conventional quantum computing relies on entangled photons, but current sources (e.g., parametric down-conversion) are optically driven, bulky, and probabilistically limited.
  • Existing sources suffer from probabilistic emission, hindering the success rate of quantum computational operations and scalability.
  • The development of an electrically driven, on-demand source of entangled photon pairs is a critical unmet need for practical quantum computing.

Purpose of the Study:

  • To realize an electrically driven source of entangled photon pairs.
  • To demonstrate the feasibility of using semiconductor quantum dots for generating entangled photons.
  • To assess the performance and fidelity of the developed entangled photon source for quantum information applications.

Main Methods:

  • Integration of a quantum dot within a semiconductor light-emitting diode (LED) structure to create an entangled-light-emitting diode (ELED).
  • Characterization of entangled photon pair emission under both direct current (d.c.) and alternating current (a.c.) electrical injection.
  • Quantification of entanglement fidelity using established quantum optical measurement techniques.

Main Results:

  • Successful demonstration of an electrically driven source of entangled photon pairs.
  • Achieved high entanglement fidelity of up to 0.82 under a.c. injection.
  • The device operates as an on-demand source, eliminating the need for complex laser-based driving systems.

Conclusions:

  • The developed entangled-light-emitting diode (ELED) represents a significant advancement towards scalable quantum information technologies.
  • High-fidelity entangled photon generation via electrical injection overcomes limitations of current optical sources.
  • The ELED is a promising platform for future quantum computing, quantum relays, and entanglement swapping applications.