Seminar: Electro-Optics and Microelectronics Seminar
Orbital-Angular-Momentum Entangled Photon Emission from Circular Currents in Semiconductor-Superconductor Structures
Date:
September,16,2024
Start Time:
14:30 - 15:30
Location:
1061, Meyer Building
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Lecturer:
Avi Koriat
Research Areas:
| Superconducting-semiconducting hybrid devices are an area of active research in recent years. Among them, the superconducting light-emitting diode (SLED) – a light-emitting diode based on superconducting charge carriers – has been shown in the past to be a potential candidate as a polarization-entangled photon source, revealing its potential for transferring spin angular momentum quantum information from superconductors to photons. In this study we demonstrate how the long-range coherence of the superconducting order parameter can be utilized to transfer the quantum information of a circular supercurrent state onto photonic channels using a SLED structure. Firstly, we theoretically demonstrate a spatial coupling mechanism between the modal electric field distribution and the macroscopic order parameter of the Bardeen-Cooper-Schrieffer (BCS) condensates. We then go on to show how circular supercurrents in the active region of the SLED result in photon emission to free-space Laguerre-Gaussian modes with nonzero orbital angular momentum. We discuss how this emission can be harnessed to convey quantum information about a qubit state potentially unlocking new possibilities for qubit readout over photonic channels. Finally, we explore how this mechanism can be harnessed for the generation of orbital-angular-momentum-entangled photon pairs.
M.Sc. student under the supervision of Prof. Alex Hayat.
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