Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter

Year: 2025

Authors: Governale M., Schtznenberger C., Scarlino P., Rastelli G.

Autors Affiliation: Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand; Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, POB 600, Wellington 6140, New Zealand; Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel, Switzerland; Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland; Ecole Polytech Fed Lausanne, Ctr Quantum Sci & Engn, CH-1015 Lausanne, Switzerland; Univ Trento, Pitaevskii Ctr Bose Einstein Condensat, CNR INO, Via Sommar 14, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Trento, Italy; Trento Inst Fundamental Phys & Applicat, INFN TIFPA, Via Sommar 14, I-38123 Trento, Italy.

Abstract: As a waveguide circuit QED architecture, we investigate theoretically the single-photon pair emission of a Cooper pair splitter composed of two double quantum dots, each coupled to a microwave transmission line. We find that this system can generate frequency-entangled photon pairs in the left and right transmission lines, specifically a superposition of two photon wave packets at different frequencies. The frequency entanglement of the two photons arises from the particle-hole coherent superposition (i.e., Andreev bound states) involving the delocalized entangled spin singlet. We also estimate a lower bound for the efficiency of entangled photon-pair generation, accounting for the presence of nonradiative processes such as phonon emissions. Our proposal is realistic and achievable with state-of-the-art techniques in quantum microwave engineering with electostatically defined semiconducting quantum dots.

Journal/Review: PRX QUANTUM

Volume: 6 (2)      Pages from: 20339-1  to: 20339-39

More Information: Education, Research and Innovation (SERI) under contract number REF-1131-52105/No SEFRI M822.00081. G.R. thanks Iacopo Carusotto, Daniel e De Bernardis, Simone Felicetti, Andras Palyi, Stefano Azzini, Giuseppe Falci, Marco Liscidini, and Philipp Hauke for stimulating discussions. C.S. acknowledges support from the European Commission through the ERC project QUEST with Grant No. 291474, from the Swiss National Science Foundation (SNSF) through Grants Ref. No. 172638, 185902 and 192027, and from the Swiss Nanoscience Institute.r Education, Research and Innovation (SERI) under contract number REF-1131-52105/No SEFRI M822.00081. G.R. thanks Iacopo Carusotto, Daniele De Bernardis, Simone Felicetti, Andras Palyi, Stefano Azzini, Giuseppe Falci, Marco Liscidini, and Philipp Hauke for stimulating discussions. C.S. acknowledges support from the European Commission through the ERC project QUEST with Grant No. 291474, from the Swiss National Science Foundation (SNSF) through Grants Ref. No. 172638, 185902 and 192027, and from the Swiss Nanoscience Institute.
KeyWords: Quantum Electrodynamics; Microwave Photon; Single-electron; Down-conversion; Spin; Noise; Silicon; Separability; Inequality
DOI: 10.1103/PRXQuantum.6.020339