Integrated photonic quantum technologies

Wang, J.; Sciarrino, Fabio; Laing, Anthony; Thompson, Mark G.

doi:10.1038/s41566-019-0532-1

Cited by 1,042 publications

(712 citation statements)

References 149 publications

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“…One of the most appealing platforms for photonic quantum technolgies is integrated optics [1,2]. Since the first demonstrations more than a decade ago [3], the complexity and scale of quantum optical circuits exponentially increased over the years [4,5,6,7].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…As such, a diagnostic probe with FL and PA dual modalities could provide much more precise information and has great potential for biological applications. 82,[96][97][98] Cai et al 99 developed the rst small-molecule "Four in One" theranostic probe RhoSSCy which integrates tumor targeting, pH/thiol detection, near-infrared uorescence (NIRF)/PA dualmodal imaging, and PDT therapy ( Fig. 8a and b).…”

Section: Fluorescence and Photoacoustic Imaging-guided Pdtmentioning

confidence: 99%

Activatable molecular agents for cancer theranostics

et al. 2020

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Theranostics that integrates diagnosis and treatment modalities has attracted great attention due to its abilities of personalized therapy and real-time monitoring of therapeutic outcome. Such a theranostic paradigm requires agents to simultaneously possess the capabilities of targeting, imaging, and treatment. Activatable molecular agents (AMAs) are promising for cancer theranostics, as they show a higher signal-to-noise ratio (SNR), real-time detection of cancer-associated biomarkers, lower normal tissue toxicity, and a higher therapeutic effect. This perspective summarizes the recent advancements of AMAs, which include imagingguided chemotherapy, imaging-guided photodynamic therapy, and imaging-guided photothermal therapy.The molecular design principles, theranostic mechanisms, and biomedical applications of AMAs are described, followed by a discussion of potential challenges of AMAs in cancer theranostics.

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“…Recent advances in integrated optics and silicon photonics have caused increasing attention to entanglement generation on chips [47,48]. Many chip-based source such as heralded single-photon sources [49,50] high-dimensional states [51,52], multiphoton states [53][54][55] and on-chip transverse-mode entangled photon pair source [56] have been successfully demonstrated.…”

Section: Bs2mentioning

confidence: 99%

Quantum experiments and hypergraphs: Multiphoton sources for quantum interference, quantum computation, and quantum entanglement

Chen

Krenn

2020

Phys. Rev. A

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We introduce the concept of hypergraphs to describe quantum optical experiments with probabilistic multi-photon sources. Every hyperedge represents a correlated photon source, and every vertex stands for an optical output path. Such general graph description provides new insights for producing complex high-dimensional multi-photon quantum entangled states, which go beyond limitations imposed by pair creation via spontaneous parametric down-conversion. Furthermore, properties of hypergraphs can be investigated experimentally. For example, the NP-Complete problem of deciding whether a hypergraph has a perfect matchin can be answered by experimentally detecting multi-photon events in quantum experiments. By introducing complex weights in hypergraphs, we show a general many-particle quantum interference and manipulating entanglement in a pictorial way. Our work paves the path for the development of multi-photon high-dimensional state generation and might inspire new applications of quantum computations using hypergraph mappings.

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Integrated photonic quantum technologies

Cited by 1,042 publications

References 149 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

Activatable molecular agents for cancer theranostics

Quantum experiments and hypergraphs: Multiphoton sources for quantum interference, quantum computation, and quantum entanglement

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