Due to their deterministic nature and efficiency, devices based on quantum dots (QD) are currently replacing traditional single-photon sources in the most complex quantum optics experiments, such as boson sampling protocols. Embedding these emitters into photonic crystal (PhCs) cavities enables the creation of an array of Purcell-enhanced single photons required to build quantum photonic integrated circuits. So far scaling of the number of these cavity-emitters nodes on a single chip has been hampered by practical problems such as the lack of post-fabrication methods to control their relative detuning and the complexity involved with their optical excitation. Here, we present a tuneable single-photon source combining electrical injection and nano-opto-electromechanical cavity tuning. The device consists of a double-membrane electromechanically tuneable PhC structure. A vertical p-i-n junction, hosted in the top membrane, is exploited to inject current in the QD layer and demonstrate a tunable nano LED whose cavity wavelength can be reversibly varied over 15 nanometers by electromechanically varying the distance between membranes. Besides, electroluminescence from single QD lines coupled to PhC cavities is reported for the first time. The measurement of the second-order autocorrelation function from a cavity-enhanced line proves the anti-bunched character of the emitted light. Since electrical injection does not produce stray pump photons, it makes the integration with superconducting single-photon detectors much more feasible. The large-scale integration of such tuneable single-photon sources, passive optics and waveguide detectors may enable the implementation of fully-integrated boson sampling circuits able to manipulate tens of photons.
Maurangelo Petruzzella, Simone Birindelli, Francesco M. Pagliano, Daniele Pellegrino, Zarko Zobenica, Michele Cotrufo, Frank W. M. van Otten, Rob W. van der Heijden, Lianhe H. Li, Edmund Linfield, and Andrea Fiore, "Single photons from electrically driven reconfigurable photonic crystal cavities (Conference Presentation)," Proc. SPIE 10358, Quantum Photonic Devices, 103580Q (Presented at SPIE Nanoscience + Engineering: August 07, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2277707.5581371610001.
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