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

Günay, Mehmet
Das, Priyam
Yüce, Emre
Polat, Emre Ozan
Bek, Alpan
Taşgın, Mehmet Emre
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.


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Citation Formats
M. Günay, P. Das, E. Yüce, E. O. Polat, A. Bek, and M. E. Taşgın, “On-demand continuous-variable quantum entanglement source for integrated circuits,” Nanophotonics, vol. 12, no. 2, pp. 229–237, 2023, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/102194.