On-demand continuous-variable quantum entanglement source for integrated circuits

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Günay M., Das P., YÜCE E., Polat E. O., BEK A., TAŞGIN M. E.

Nanophotonics, vol.12, no.2, pp.229-237, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 2
  • Publication Date: 2023
  • Doi Number: 10.1515/nanoph-2022-0555
  • Journal Name: Nanophotonics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC, Directory of Open Access Journals
  • Page Numbers: pp.229-237
  • Keywords: Fano resonances, quantum integrated circuits, quantum optics, voltage control
  • Hacettepe University Affiliated: Yes

Abstract

© 2023 the author(s), published by De Gruyter, Berlin/Boston 2023.Integration of devices generating non-classical states (such as entanglement) into photonic circuits is one of the major goals in achieving integrated quantum circuits (IQCs). This is demonstrated successfully in recent decades. Controlling the non-classicality generation in these micron-scale devices is also crucial for the robust operation of the IQCs. Here, we propose a micron-scale quantum entanglement device whose nonlinearity (so the generated non-classicality) can be tuned by several orders of magnitude via an applied voltage without altering the linear response. Quantum emitters (QEs), whose level-spacing can be tuned by voltage, are embedded into the hotspot of a metal nanostructure (MNS). QE-MNS coupling introduces a Fano resonance in the "nonlinear response". Nonlinearity, already enhanced extremely due to localization, can be controlled by the QEs' level-spacing. Nonlinearity can either be suppressed or be further enhanced by several orders. Fano resonance takes place in a relatively narrow frequency window so that ∼meV voltage-tunability for QEs becomes sufficient for a continuous turning on/off of the non-classicality. This provides as much as 5 orders of magnitude modulation depths.