Direct characterization of a nonlinear photonic circuit’s wave function with laser light

Lenzini, Francesco; Poddubny, Alexander N.; Titchener, James; Fisher, Paul; Boes, Andreas; Kasture, Sachin; Haylock, Ben; Villa, Matteo; Mitchell, Arnan; Solntsev, Alexander S.; Sukhorukov, Andrey A.; Lobino, Mirko

doi:10.1038/lsa.2017.143

Cited by 44 publications

(49 citation statements)

References 29 publications

(59 reference statements)

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“…A method for the extraction of the complex JSA in multi-port devices, which implements DFG, has been proposed based on the eigenmode expansion of single channel excitations [25]. SET has been also extended to others degrees of freedom, like space [24] and polarization [26,27]. The Joint Spectral Phase (JSP) is of the same relevance of the JSI, but historically received minor attentions.…”

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confidence: 99%

Phase-resolved joint spectra tomography of a ring resonator photon pair source using a silicon photonic chip

Borghi¹

2020

Opt. Express

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The exponential growth of photonic quantum technologies is driving the demand of tools for measuring the quality of their information carriers. One of the most prominent is Stimulated Emission Tomography (SET), which uses classical coherent fields to measure the Joint Spectral Amplitude (JSA) of photon pairs with high speed and resolution. While the modulus of the JSA can be directly addressed from a single intensity measurement, the retrieval of the Joint Spectral Phase (JSP) is far more challenging and received minor attentions. However, a wide class of spontaneous sources of technological relevance, as chip integrated micro-resonators, have a JSP with a rich structure, that carries correlations hidden in the intensity domain. Here, using a compact and reconfigurable silicon photonic chip, it is measured for the first time the complex JSA of a micro-ring resonator photon pair source. The photonic circuit coherently excites the ring and a reference waveguide, and the interferogram formed by their stimulated fields is used to map the ring JSP through a novel phase reconstruction technique. This tool complements the traditionally bulky and sophisticated methods implemented so far, simultaneously minimizing the set of required resources.A PREPRINT -JANUARY 10, 2020 the modulus of the JSA, referred as the Joint Spectral Intensity (JSI), since it is directly measurable from the power of the stimulated field. Examples includes silicon nanowires [18], AlGaAs ridge waveguides [19], optical fibers [20,21], All-Pass resonators [22] and coupled rings [23]. A variation of SET, which implements Sum Frequency Generation (SFG), has been used to map the JSA of an array of evanescently coupled Lithium Niobate waveguides [24]. A method for the extraction of the complex JSA in multi-port devices, which implements DFG, has been proposed based on the eigenmode expansion of single channel excitations [25]. SET has been also extended to others degrees of freedom, like space [24] and polarization [26,27]. The Joint Spectral Phase (JSP) is of the same relevance of the JSI, but historically received minor attentions. The JSI itself is, however, an incomplete picture of the quantum state, since it hides the spectral correlations encoded in the phase domain [28]. As an example, only the lower bound of the Schmidt number can be estimated if the JSP is not known [19]. Beside quantum homodyne tomography of two photon states [29,30], which suffers the same time and resolution issues of spectrally resolved coincidence measurements, phase resolved applications of SET have been so far limited to in-line sources as waveguides [28,31] or cold atomic ensembles [32]. In all these works, the Pump, the Seed and the reference beams are all carved from the same laser source to guarantee mutual coherence, and fiber based interferometers are used to extract the JSP.Here, a novel technique which allows to measure the complex JSA of a double bus, integrated silicon ring resonator, is proposed and experimentally validated. The method exploits the on-chip inte...

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confidence: 99%

Phase-resolved joint spectra tomography of a ring resonator photon pair source using a silicon photonic chip

Borghi¹

2020

Opt. Express

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“…tion formalism outlined earlier [20,21], we demonstrate that one can obtain N00N-states of SPP pairs by using a GaAs nanoparticle, and that this result remains robust for a wide range of excitation conditions owing to general symmetry properties of Green's function of the nanoparticle.…”

Section: Introductionmentioning

confidence: 53%

Generating Quantum States of Surface Plasmon-Polariton Pairs with a Nonlinear Nanoparticle

Olekhno

Petrov

Iorsh

et al. 2019

2019 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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We consider a generation of two-particle quantum states in the process of spontaneous parametric down-conversion of light by a dielectric nanoparticle with χ (2) response. As a particular example, we study the generation of surface plasmon-polariton pairs with an AlGaAs nanoparticle located at the silver-air interface. We show that for particular excitation geometries, N00N-states of surface plasmon-polariton pairs could be obtained. The effect can be physically interpreted as a result of quantum interference between pairs of induced sources, each emitting either signal or idler plasmon. We then relate the resulting N00N-pattern to the general symmetry properties of dyadic Green's function of a dipole emitter exciting surface waves. It renders the considered effect as a general way towards a robust generation of N00N-states of surface waves using spontaneous parametric down-conversion in χ (2) nanoparticles. arXiv:2002.05268v1 [physics.optics]

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“…To solve this issue, we resort to the quantum-classical correspondence between SPDC and its reversed process, namely sum-frequency generation (SFG), where the generated sum-frequency and pump waves propagate in opposite directions to the SPDC pump, signal and idler (32,33).…”

Section: Resultsmentioning

confidence: 99%

Spontaneous photon-pair generation from a dielectric nanoantenna

Marino

Solntsev

et al. 2019

Optica

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125

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Optical nanoantennas have shown a great capacity for efficient extraction of photons from the near to the far-field, enabling directional emission from nanoscale single-photon sources. However, their potential for the generation and extraction of multi-photon quantum states remains unexplored. Here we demonstrate experimentally the nanoscale generation of two-photon quantum states at telecommunication wavelengths based on spontaneous parametric down-conversion in an optical nanoantenna. The antenna is a crystalline Al-GaAs nanocylinder, possessing Mie-type resonances at both the pump and the bi-photon wavelengths and when excited by a pump beam generates photonpairs with a rate of 35 Hz. Normalized to the pump energy stored by the nanoantenna, this rate corresponds to 1.4 GHz/Wm, being one order of magnitude higher than conventional on-chip or bulk photon-pair sources. Our experiments open the way for multiplexing several antennas for coherent generation of multi-photon quantum states with complex spatial-mode entanglement and applications in free-space quantum communications and sensing.

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Direct characterization of a nonlinear photonic circuit’s wave function with laser light

Cited by 44 publications

References 29 publications

Phase-resolved joint spectra tomography of a ring resonator photon pair source using a silicon photonic chip

Phase-resolved joint spectra tomography of a ring resonator photon pair source using a silicon photonic chip

Generating Quantum States of Surface Plasmon-Polariton Pairs with a Nonlinear Nanoparticle

Spontaneous photon-pair generation from a dielectric nanoantenna

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