Robust spectral phase reconstruction of time-frequency entangled bi-photon states

Gianani, Ilaria

doi:10.1103/physrevresearch.1.033165

Cited by 8 publications

(3 citation statements)

References 41 publications

(43 reference statements)

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“…A full characterisation of the biphoton quantum state could be obtained via quantum state tomography in the TFM basis, which requires projective measurements onto three mutually unbiased bases using cascades of tailored nonlinear processes [22][23][24], or by reconstructing the JSA including its phase, which assumes a pure biphoton state and involves complex interferometric techniques [25][26][27]. , Entanglement swapping setup: Successful entanglement swapping is heralded by a coincidence detection of the photons after the FBS.…”

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confidence: 99%

Direct Generation of Tailored Pulse-Mode Entanglement

et al. 2020

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Photonic quantum technology increasingly uses frequency encoding to enable higher quantum information density and noise resilience. Pulsed time-frequency modes (TFM) represent a unique class of spectrally encoded quantum states of light that enable a complete framework for quantum information processing. Here, we demonstrate a technique for direct generation of entangled TFMencoded states in single-pass, tailored downconversion processes. We achieve unprecedented quality in state generation-high rates, heralding efficiency and state fidelity-as characterised via highly resolved time-of-flight fibre spectroscopy and two-photon interference. We employ this technique in a four-photon entanglement swapping scheme as a primitive for TFM-encoded quantum protocols.Generating entanglement in intrinsically highdimensional degrees of freedom of light, such as transverse and longitudinal spatial modes [1,2], or time and frequency, constitutes a powerful resource for photonic quantum technologies-photons that carry more information enable more efficient protocols [3,4]. Time-frequency encoding is intrinsically suitable for waveguide integration and fibre transmission [5,6], making it a promising choice for practical, high-dimensional quantum applications.Quantum information can be encoded either in discrete temporal or spectral modes (namely time-and frequency-bin encoding [6-9]) or in the spectral envelope of the singlephoton wavepackets-time-frequency mode (TFM) encoding [5,10]. TFM-encoded states arise naturally in parametric downconversion (PDC) sources, as TFMs are eigenstates of the PDC process and they span an infinite-dimensional Hilbert space. Conveniently, TFMs possess highly desirable properties: being centred around a target wavelength makes them compatible with fibre networks, they are robust against noise [11] and chromatic dispersion [12], their pulsed nature enables synchronisation and therefore multi-photon protocols and they offer intrinsically high dimensionality [10]. Manipulation and detection of TFMs is enabled by the quantum-pulse toolbox, where sum-and difference-frequency generation are used for reshaping and projecting the quantum states [5,10]. However, generating entangled TFMs in a controlled way can be very challenging [13][14][15][16][17], limiting their usefulness in realistic scenarios. Here, we overcome this problem exploiting domain-engineered nonlinear crystals [18,19] for generating TFM entanglement from standard ultrafast laser pulses in a single-pass PDC experiment. We experimentally validate this technique by benchmarking a maximally antisymmetric state at telecom wavelength † These two authors contributed equally.with near unity fidelity, and implement a four-photon entanglement swapping scheme. Our work complements the pulse-gate toolbox [5,10] for TFM quantum information processing, and establishes a standard for the generation of TFM quantum states of light while paving the way for more complex frequency encoding.In a PDC process, a pump photon probabilistically downconverts into t...

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Direct Generation of Tailored Pulse-Mode Entanglement

et al. 2020

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“…This has been tackled in Ref. [109,110], where a quantum adaptation of the MICE technique is proposed.…”

Section: Reconstruction Of the Joint Spectral Amplitudementioning

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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“…For instance, the coincidence probability obtained with the generalized HOM interferometry allows measuring the phase-matching function of a photon pair produced by spontaneous parametric down conversion (SPDC) [20,21]. Others techniques have been investigated to measure the spectral property of photon pairs such as shear interferometry [22][23][24], or the measurement of four marginals of the chronocyclic Wigner distribution of biphoton states in [25]. The spectral-temporal tomography of single photons has also been realized, with a compressive technique measuring the chronocyclic Wigner distribution through its mode decomposition [26], direct measurement of the density matrix with a spectrally-resolved HOM interferometer [27] and by interfering a known reference field and the single photon of interest [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Spectral single photons characterization using generalized Hong, Ou and Mandel interferometry

Fabre

2021

Preprint

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We propose new methods to characterize the spectral-temporal distribution of single photons. The presented protocols take advantage of spectral filtering, frequency entanglement between two single photons the one of interest and a reference, followed by the generalized Hong, Ou and Mandel interferometer. The measurement of the coincidence probability in these different schemes reveals the chronocyclic Wigner, the pseudo-Wigner distribution and the spectrogram at the single photon level.

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Robust spectral phase reconstruction of time-frequency entangled bi-photon states

Cited by 8 publications

References 41 publications

Direct Generation of Tailored Pulse-Mode Entanglement

Direct Generation of Tailored Pulse-Mode Entanglement

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

Spectral single photons characterization using generalized Hong, Ou and Mandel interferometry

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