Mr. Alessandro Trenti Profile

Alessandro Trenti

PhD

SPIE Involvement:

Author

Area of Expertise:

quantum optics , silicon photonics , nonlinear optics

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I am an experimental physicist involved in quantum optics experiments within the SiQuro project, at the University of Trento, Italy.
In particular, by means of optical nonlinear effects, we generate entangled photon pairs, which are the revealed thanks to single-photon detectors. The typical measurement performed is a coincidence measurement. We work either in integrated or free space set-up.
In the last months I was focused in this kind of measurement in the Mid Infrared part of the electromagnetic spectrum, that is to say at a wavelength of about 3 micron. The challenge of this work is to find a suitable single-photon detector in the MIR, which is a task not trivial at all.
Generally I am interest in studying optical nonlinear phenomena, within the field of quantum photonics and silicon photonics (even not quantum!).
Recently I won the best student paper presentation at SPIE's Photonics Europe International Symposia held 3-7 April 2016 in Brussels (Belgium), in the section: Nonlinear Optics and its Applications. The title of my contribution was: "One and two-photon quantum interference in a Mach-Zehnder interferometer", which was published in the SPIE Conference Proceedings.

Proceedings Article | 19 July 2022 Presentation

Memoryless quantum money: experimental demonstration and real-world applications

Julia Kalb, Peter Schiansky, Alessandro Trenti, Esther Sztatecsny, Mathieu Bozzio, Philip Walther

Proceedings Volume PC12243, PC122430C (2022) https://doi.org/10.1117/12.2632490

KEYWORDS: Quantum key distribution, Information security, Network security, Tolerancing, Quantum physics, Quantum computing

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Proceedings Article | 19 July 2022 Poster

Memoryless quantum tokens for online payment networks

Esther Sztatecsny, Mathieu Bozzio, Julia Kalb, Peter Schiansky, Alessandro Trenti, Philip Walther

Proceedings Volume PC12243, PC122430A (2022) https://doi.org/10.1117/12.2641230

KEYWORDS: Quantum key distribution, Quantum computing, Optical fibers, Network security, Information security

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Proceedings Article | 4 March 2019 Presentation

Second order nonlinearities in silicon waveguides: from the physics to new applications (Conference Presentation)

Chiara Vecchi, Claudio Castellan, Pierre Guilleme, Alessandro Trenti, Martino Bernard, Maria Parisi, Mher Ghulinyan, Georg Pucker, Maurizio de Rosa, Lorenzo Pavesi

Proceedings Volume 10921, 1092109 (2019) https://doi.org/10.1117/12.2506030

KEYWORDS: Silicon, Waveguides, Physics, Second-harmonic generation, Interfaces, Crystals, Nonlinear crystals, Harmonic generation, Electro optics, Modulation

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Proceedings Article | 23 May 2018 Presentation

Controlling stimulated and spontaneous four wave mixing in coupled microring resonators (Conference Presentation)

Massimo Borghi, Alessandro Trenti, Jean Marc Fédéli, Lorenzo Pavesi

Proceedings Volume 10684, 1068408 (2018) https://doi.org/10.1117/12.2307324

KEYWORDS: Resonators, Microrings, Four wave mixing, Integrated optics, Silicon photonics, Waveguides, Quantum efficiency, Light wave propagation, Geometrical optics, Microresonators

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A common strategy for increasing the efficiency of Stimulated and Spontaneous FourWave Mixing (SFWM) in integrated optical devices, is to enhance the intensity of the propagating optical field through nanoscale geometrical engineering. Typically, this is accomplished by confining light into microresonators or into sequences of mutually coupled cavities. Usually these structures are treated as a whole, with tens or hundreds of repeating units. In these structures, long grange periodicity is deliberately sought to tailor the frequency wavevector band diagram, in order to increase the group index while keeping the group velocity dispersion as low as possible. Having to deal with a large number of unit cells inherently precludes the study of the impact of the internal degree of freedom on FWM. The implementation of complex and extended structures precludes the observation of FWM regimes which are in general hidden, or overhung, by the long range periodicity, and that can emerge only by acting at the single resonator level. In this work, we study SFWM in a system made by two Silicon microring resonators (photonic dimer) of radius 7 um, quality factor Q = 10000 and separation 53.1 um, which are indirectly coupled by means of two waveguides with a coupling gap of 160 nm. We independently change the inter-cavity phase f, and the resonator eigenfrequency detuning d, by respectively implementing a Peltier cell and micro-heaters placed on the top of the resonators. We experimentally and theoretically demonstrate that, in the parameter space spanned by (f, d), the efficiency of SFWM can be enhanced, left unchanged or being completely suppressed with the respect to a single uncoupled resonator. This plethora of regimes can not be easily resolved and accomplished in large structures, where the structural periodicity makes slow light to overwhelm any other side effect. Here, a FWM enhancement of 7 dB with respect to each single constituent of the molecule is demonstrated, and attributed to the increase of internal field enhancement of one of the resonator induced by the presence of the other. We theoretically prove that this phenomenon is linked to the excitation of a sub-radiant mode in the structure. FWM suppression arises from the coherent destructive interference between the signal waves generated in the two resonators which are scattered into a common waveguide channel. We find that in the region where SFWM is enhanced, also the efficiency of Spontaneous Four Wave Mixing, the quantum counterpart of the stimulated process, is increased. This opens a plenty of possibilities for the implementation of this device for the generation of correlated photon pairs. We suggest that pairs could be deterministically bunched into a single scattering channel with a brightness that overcomes the one of a critically coupled resonator. This could beat the effective 50% of losses which suffer All-Pass and Add-Drop resonators, and could show superior brightness with respect to asymmetric microrings or dual Mach-Zehnder-microrings devices, whose maximum achievable field enhancement is inherently limited by the level attained at critical coupling.

Proceedings Article | 15 February 2018 Paper

Mid-infrared coincidence measurements based on intracavity frequency conversion

S. Piccione, M. Mancinelli, A. Trenti, G. Fontana, J. Dam, P. Tidemand-Lichtenberg, C. Pedersen, L. Pavesi

Proceedings Volume 10516, 105161P (2018) https://doi.org/10.1117/12.2305713

KEYWORDS: Photons, Crystals, Nonlinear crystals, Single photon detectors, Quantum efficiency, Mid-IR

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Proceedings Article | 29 August 2017 Presentation + Paper

From SHG to mid-infrared SPDC generation in strained silicon waveguides

Claudio Castellan, Alessandro Trenti, Mattia Mancinelli, Alessandro Marchesini, Mher Ghulinyan, Georg Pucker, Lorenzo Pavesi

Proceedings Volume 10358, 1035804 (2017) https://doi.org/10.1117/12.2273641

KEYWORDS: Silicon, Mid-IR, Waveguides, Photons, Second-harmonic generation, Signal detection, Harmonic generation, Nonlinear optics, Crystals, Nonlinear crystals

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Proceedings Article | 27 April 2016 Presentation + Paper

One and two-photon quantum interference in a Mach-Zehnder interferometer

A. Trenti, M. Borghi, M. Mancinelli, H. Price, G. Fontana, L. Pavesi

Proceedings Volume 9894, 98940W (2016) https://doi.org/10.1117/12.2223061

KEYWORDS: Beam splitters, Interferometers, Nonlinear optics, Phase velocity, Mach-Zehnder interferometers, Quantum optics, Photodetectors, Transmittance, Single photon, Sensors, Electroluminescent displays

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