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arXiv · 2205.12741

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

Mehmet Günay·Priyam Das·Emre Yuce·Emre Ozan Polat·Alpan Bek·Mehmet Emre Tasgin
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Abstract

Integration of devices generating nonclassical 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 nonclassicality 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 nonclassicality) can be tuned by several orders of magnitude via an \textit{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 (also when the probe is on the device) or be further enhanced by several orders. Fano resonance takes place in a relatively narrow frequency window so that $\sim$meV voltage-tunability for QEs becomes sufficient for a \textit{continuous} turning on/off of the nonclassicality. This provides as much as 5 orders of magnitude modulation depths.

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Mehmet Günay, Priyam Das, Emre Yuce, Emre Ozan Polat, Alpan Bek, Mehmet Emre Tasgin. 2022-05-25. On-demand continuous-variable quantum entanglement source for integrated circuits. https://doi.org/10.1515/nanoph-2022-0555

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