Detection of squeezed light with glass-integrated technology embedded into a homodyne detector setup

Porto, Carmen; Rusca, Davide; Cialdi, S.; Crespi, Andrea; Osellame, Roberto; Tamascelli, Dario; Olivares, Stefano; Paris, Matteo G. A.

doi:10.1364/josab.35.001596

Cited by 18 publications

(10 citation statements)

References 41 publications

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“…The merge between continuous variables (CV) and integrated optics is a hot topic in the quantum optics community [1][2][3][4][5][6]. By exploiting strong optical confinement, integrated nonlinear optics permits one to enhance the efficiency of quantum light sources, in broadband single pass configuration [7,8].…”

Section: Introductionmentioning

confidence: 99%

Minimum resources for versatile continuous-variable entanglement in integrated nonlinear waveguides

et al. 2018

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In a recent paper [Phys. Rev. A 96, 053822 (2017)], we proposed a strategy to generate bipartite and quadripartite continuous-variable entanglement of bright quantum states based on degenerate down-conversion in a pair of evanescently coupled nonlinear χ (2) waveguides. Here, we show that the resources needed for obtaining these features can be optimized by exploiting the regime of second harmonic generation: the combination of depletion and coupling among pump beams indeed supplies all necessary wavelengths and appropriate phase mismatch along propagation. Our device thus entangles the two fundamental classical input fields without the participation of any harmonic ancilla. Depending on the propagation distance, the generated harmonics are entangled in bright or vacuum modes. We also evidence two-color bipartite and quadripartite entanglement over the interacting modes. The proposed device represents a boost in continuous-variable integrated quantum optics since it enables a broad range of quantum effects in a very simple scheme, which optimizes the resources and can be easily realized with current technology.

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Section: Introductionmentioning

confidence: 99%

Minimum resources for versatile continuous-variable entanglement in integrated nonlinear waveguides

et al. 2018

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“…In other two recent experiments [181,182], FLM optical circuits have been used for the implementation of advanced detection schemes of non-classical states of light. In [181], a fused silica FLM chip has been used for sampling the statistics of multiphoton states of light.…”

Section: Integrated Detectionmentioning

confidence: 99%

“…This device contained a 1×8 beam divider, fiber-coupled to an array of eight standard avalanche photodiode single photon detectors. In [182], instead, the authors performed an integrated homodyne tomography of coherent and squeezed light states by means of a laser-written circuit containing a balanced beam splitter and a thermo-optic phase shifter. Although in these experiments the actual photon detecting elements were not integrated within the photonic chip, they show the potential of FLM in developing advanced quantum light analysis.…”

Section: Integrated Detectionmentioning

confidence: 99%

Femtosecond laser micromachining for integrated quantum photonics

Corrielli,

Crespi,

Osellame

2021

Preprint

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Integrated quantum photonics, i.e. the generation, manipulation and detection of quantum states of light in integrated photonic chips, is revolutionizing the field of quantum information in all applications, from communications to computing. Although many different platforms are being currently developed, from silicon photonics to lithium niobate photonic circuits, none of them has shown the versatility of femtosecond laser micromachining (FLM) in producing all the components of a complete quantum system, encompassing quantum sources, reconfigurable state manipulation, quantum memories and detection. It is in fact evident that FLM has been a key enabling tool in the first-time demonstration of many quantum devices and functionalities. Although FLM cannot achieve the same level of miniaturization of other platforms, it still has many unique advantages for integrated quantum photonics. In particular, in the last five years, FLM has greatly expanded its range of quantum applications with several scientific breakthroughs achieved. For these reasons, we believe that a review article on this topic is very timely and could further promote the development of this field by convincing end-users of the great potentials of this technological platform and by stimulating more research groups in FLM to direct their efforts to the exciting field of quantum technologies.

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“…[21,22] The introduction of thermal phase shifters in FLW-PICs has greatly extended both the quality and the applicability of these devices. [23][24][25] However, some design challenges prevent their deployment on a larger scale. First, thermal shifters in FLW-PICs suffer from high power consumption and, up to now, a 2 phase modulation has been demonstrated only with a dissipation of hundreds of milliwatts.…”

Section: Introductionmentioning

confidence: 99%

Low Power Reconfigurability and Reduced Crosstalk in Integrated Photonic Circuits Fabricated by Femtosecond Laser Micromachining

Ceccarelli

Atzeni

Pentangelo

et al. 2020

Laser & Photonics Reviews

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Femtosecond laser writing is a powerful technique that allows rapid and cost-effective fabrication of photonic integrated circuits with unique 3D geometries. In particular, the possibility to reconfigure such devices by thermo-optic phase shifters represents a paramount feature, exploited to produce adaptive and programmable circuits. However, the scalability is strongly limited by the flaws of current thermal phase shifters, which require hundreds of milliwatts to operate and exhibit large thermal crosstalk. In this work, thermally-insulating 3D microstructures are exploited to decrease the power needed to induce a 2 phase shift down to 37 mW and to reduce the crosstalk to a few percent. Further improvement is demonstrated when operating in vacuum, with sub-milliwatt power dissipation and negligible crosstalk. These results pave the way toward the demonstration of complex programmable integrated photonic circuits fabricated by femtosecond laser writing, thus opening exciting perspectives in integrated quantum photonics.

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Detection of squeezed light with glass-integrated technology embedded into a homodyne detector setup

Cited by 18 publications

References 41 publications

Minimum resources for versatile continuous-variable entanglement in integrated nonlinear waveguides

Minimum resources for versatile continuous-variable entanglement in integrated nonlinear waveguides

Femtosecond laser micromachining for integrated quantum photonics

Low Power Reconfigurability and Reduced Crosstalk in Integrated Photonic Circuits Fabricated by Femtosecond Laser Micromachining

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