Characterization of the photon-number state of a narrow-band single photon generated from a cold atomic cloud

Gu, Zhenjie; Yang, Ce; Chen, Jiefei

doi:10.1016/j.optcom.2019.01.074

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…We numerically trained NNs for 3-qubit and 2-qubit QST. For the 2-qubit system, the number of sampled operators m ∈ [6,8,10,12]; for the 3-qubit system, m ∈ [20,25,30,35,40]. Plainly, m equals the number of input neurons, and n decides the number of output neurons.…”

Section: Aonn For Qstmentioning

confidence: 99%

“…Recently, apart from generating optical quantum states [25] and optical quantum communication over long distance [26], multiple state-of-the-art experiments on optical quantum interfaces to store [27] and distribute entanglements [28,29] have been exhibited. Among all of these, QST is essential for not only characterizing generation and preservation of quantum states but also verifying the entanglement distributed across the whole network.…”

Section: Introductionmentioning

confidence: 99%

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All-optical neural network quantum state tomography

Zuo,

Cao,

Cao

et al. 2021

Preprint

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Quantum state tomography (QST) is a crucial ingredient for almost all aspects of experimental quantum information processing. As an analog of the"imaging" technique in the quantum settings, QST is born to be a data science problem, where machine learning techniques, noticeably neural networks, have been applied extensively. In this work, we build an integrated all-optical setup for neural network QST, based on an all-optical neural network (AONN). Our AONN is equipped with built-in nonlinear activation function, which is based on electromagnetically induced transparency. Experiment results demonstrate the validity and efficiency of the all-optical setup, indicating that AONN can mitigate the state-preparation-and-measurement error and predict the phase parameter in the quantum state accurately. Given that optical setups are highly desired for future quantum networks, our all-optical setup of integrated AONN-QST may shed light on replenishing the alloptical quantum network with the last brick.

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Section: Aonn For Qstmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

All-optical neural network quantum state tomography

Zuo,

Cao,

Cao

et al. 2021

Preprint

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“…In contrast from the conventional photon counting scheme to characterize this photonic quantum source, in this Letter we utilize the balanced homodyne detection (BHD) scheme [35] to reconstruct the reduced quantum state of the paired photons with one of the photons as the trigger. The mode-matching between the local oscillator (LO) in BHD and the target photons is improved compared to the previous experimental setup [36] by splitting part of the LO beam and shifting its frequency over 3 GHz by an electric-optic modulator to provide the coupling beam in SFWM. Therefore, within the photon source, we obtain more than 29% for the singlephoton-composition, with the coherence time exceeding 200 ns.…”

mentioning

confidence: 99%

Towards High-Dimensional Entanglement in Path: Photon-Source Produced from a Two-Dimensional Atomic Cloud

Liu¹,

Lai²,

Yang³

et al. 2021

Chinese Phys. Lett.

Self Cite

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A photon source with high-dimensional entanglement is able to bring increasing capacity of information in quantum communication. The dimensionality is determined by the chosen degree of freedom of the photons and is limited by the complexity of the physical systems. Here we propose a new type of high-dimensional entangled photon source, generated via path-indistinguishable scheme from a two-dimensional atomic cloud, which is prepared in a magneto-optical trap. To verify the photon source, we demonstrate experimentally the quantum state of the single photons heralded by its partner photon, with homodyne tomographic technology.

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Review of Biphoton Sources Based on the Double‐Λ$\Lambda$ Spontaneous Four‐Wave Mixing Process

Chen,

Peters,

Hsieh

et al. 2024

Adv Quantum Tech

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This review article focuses on biphoton sources based on the double‐ spontaneous four‐wave mixing (SFWM) process in laser‐cooled as well as room‐temperature or hot atomic ensembles. These biphoton sources have the advantage of providing stable frequencies, ultranarrow linewidths, and a tunability of the temporal biphoton width of more than one order of magnitude for high‐bandwidth applications. Therefore, the generated photons can be efficiently interfaced to, e.g., atomic quantum memories. In contrast, solid‐state biphoton sources typically require assistance by an optical cavity to operate at narrow linewidth that limits the tunability of the temporal width of the biphotons. Present state‐of‐the‐art double‐ SFWM biphoton sources can achieve one of the following results: a spectral linewidth of 50 kHz (290 kHz) or a temporal width of 13 (580 ns) with cold (hot) atoms, a detection rate of about 7 cps, and a generation rate of cps at a duty cycle of 0.4% or of cps in the steady state. The theoretical background of these biphoton sources, experimental implementations with cold and hot atoms, and progress over the years, will be illustrated.

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Characterization of the photon-number state of a narrow-band single photon generated from a cold atomic cloud

Cited by 3 publications

References 31 publications

All-optical neural network quantum state tomography

All-optical neural network quantum state tomography

Towards High-Dimensional Entanglement in Path: Photon-Source Produced from a Two-Dimensional Atomic Cloud

Review of Biphoton Sources Based on the Double‐Λ$\Lambda$ Spontaneous Four‐Wave Mixing Process

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