Fast and highly resolved capture of the joint spectral density of photon pairs

Fang, Bin; Cohen, Offir; Liscidini, Marco; Sipe, J. E.; Lorenz, Virginia O.

doi:10.1364/optica.1.000281

Cited by 95 publications

(64 citation statements)

References 25 publications

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“…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].…”

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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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“…The advantage also allows to improve the spectral resolution, by relying on conventional spectrometers. This technique has known several implementations [124][125][126]; here we review the one by S. Ducci's group in Ref. [119] as an illustrative example, where SET has been compared to standard JSI retrieval via coincidence counting spectrometers.…”

Section: Stimulated Emission Tomographymentioning

confidence: 99%

Measuring the time–frequency properties of photon pairs: A short review

Gianani

Sbroscia

Barbieri

2020

AVS Quantum Science

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Encoding information in the time-frequency domain is demonstrating its potential for quantum information processing. It offers a novel scheme for communications with large alphabets, computing with large quantum systems, and new approaches to metrology. It is then crucial to secure full control on the generation of time-frequency quantum states and their properties. Here, we present an overview of the theoretical background and the technical aspects related to the characterization of time-frequency properties of two-photon states. We provide a detailed account of the methodologies which have been implemented for measuring frequency correlations and for the retrieval of the full spectral wavefunction. This effort has benefited enormously from the adaptation of classical metrology schemes to the needs of operating at the single-photon level.

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“…As shown in Fig.2, we first inject a seed (α in ) into the signal field and observe the output at idler field (β out ). This is similar to the method of stimulated emission tomography [21,22] but we use the information obtained at the measurement to modify the input seed with wave shapers: with the shape measured at idler (β out ), we then inject this shape of pulse into the idler field and in the meantime observe the output at the signal field (α out ). Now we have a new shape for the input signal seed.…”

Section: Temporal Modes Determinationmentioning

confidence: 99%

Direct temporal mode measurement of photon pairs by stimulated emission

Chen

2020

Phys. Rev. A

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It is known that photon pairs generated from pulse-pumped spontaneous parametric processes can be described by independent temporal modes and form a multi-temporal mode entangled state. However, the exact form of the temporal modes is not known even though the joint spectral intensity of photon pairs can be measured by the method of stimulated emission tomography. In this paper, we describe a feedback-iteration method which, combined with the stimulated emission method, can give rise to the exact forms of the independent temporal modes for the temporally entangled photon pairs.

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Fast and highly resolved capture of the joint spectral density of photon pairs

Cited by 95 publications

References 25 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

Measuring the time–frequency properties of photon pairs: A short review

Direct temporal mode measurement of photon pairs by stimulated emission

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