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quantum Sensing and Nano Electronics and Photonics XIX 2023

作者： Faruque, Imad I. Burridge, Ben M. Joshi, Siddarth K. Rarity, John G. Barreto, Jorge Quantum Engineering Technology Laboratories University of Bristol Bristol United Kingdom Quantum Engineering Centre for Doctoral Training Centre for Nanoscience & Quantum Information University of Bristol Bristol United Kingdom

ISBN: (纸本)9781510659650

quantum technology promises to deliver quantum computers, unbreakable communication and ultra-sensitive sensors. quantum photonics is one of the prominent platforms of quantum technology which utilizes photons - often called flying qubits. Entanglement generated from a photon-pair source is a crucial resource for many quantum photonic implementations, for example, an entanglement-based global quantum network and metrology beyond classical limits. Here, we will discuss our recent results of chip-scale photon-pair sources in silicon photonics. These results are focused on improving brightness, spectral purity and indistinguishability of the photon-pair sources, for example, by engineering photonic structures and temporal pulse shaping. We have found that both methods have trade-offs among brightness, spectral purity and indistinguishability. Additionally, we have observed that generating a high-fidelity quantum state using a quantum photonic circuit requires sufficient isolation between the nonlinear photon-pair sources and the linear photonic circuit. It is crucial to remove the nonlinear effect of the strong pump both before and after the sources to limit the spurious photon-pair generation which contaminates the target quantum state. © 2023 SPIE.

关键词： Silicon photonics

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Taking tomographic measurements for photonic qubits 88 ns before they are created

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Chinese Physics B 2021年第4期30卷 55-60页

作者： Zhibo Hou Qi Yin Chao Zhang Han-Sen Zhong Guo-Yong Xiang Chuan-Feng Li Guang-Can Guo Geoff J.Pryde Anthony Laing Key Laboratory of Quantum Information University of Science and Technology of ChinaCASHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Centre for Quantum Computation and Communication Technology(CQC2T)and Centre for Quantum Dynamics Griffith UniversityBrisbane4111Australia Quantum Engineering and Technology Laboratories School of Physics and Department of Electrical and Electronic EngineeringUniversity of BristolUK

We experimentally demonstrate that tomographic measurements can be performed for states of qubits before they are prepared.A variant of the quantum teleportation protocol is used as a channel between two instants in time,allowing measurements for polarization states of photons to be implemented 88 ns before they are *** data taken at the early time and later unscrambled according to the results of the protocol’s Bell measurements,produces density matrices with an average fidelity of 0.90±0.01 against the ideal states of photons created at the later *** tomography of the time reverse quantum channel finds an average process fidelity of 0.84±*** our proof-of-principle implementation necessitates some post-selection,the general protocol is deterministic and requires no post-selection to sift desired states and reject a larger ensemble.

关键词： teleportation tomography time reverse

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Cryogenic calibration of photonic circuits using the reversible deposition of xenon

Cryogenic calibration of photonic circuits using the reversi...

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CLEO: Science and Innovations, S and I 2022

作者： Burridge, Ben M. Villarreal-Garcia, Gerardo E. Gentile, Antonio A. Jiang, Pisu Barreto, Jorge Quantum Engineering Technology Laboratories University of Bristol Bristol United Kingdom Quantum Engineering Centre for Doctoral Training Centre for Nanoscience and Quantum Information University of Bristol Bristol United Kingdom Qu & Co BV Amsterdam Netherlands

We realize reconfigurable photonic devices that, once configured, consume no power. Here, we use the controlled deposition and sublimation of xenon to achieve π-phase shifts over a minimum length of just Lπ = 12.3&#... 详细信息

ISBN: (纸本)9781557528209

关键词： Timing circuits

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Implementation of Shor’s algorithm with a single photon in 32 dimensions

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Physical Review Applied 2024年第3期22卷 034003页

作者： Hao-Cheng Weng Chih-Sung Chuu Department of Physics Center for Quantum Science and Technology National Tsing Hua University Hsinchu 30013 Taiwan Quantum Engineering Technology Laboratories H. H. Wills Physics Laboratory University of Bristol United Kingdom

Photonics has been a promising platform for implementing quantum technologies owing to its scalability and robustness. In this paper, we demonstrate the encoding of information in 32 time bins or dimensions of a single photon. A practical scheme for manipulating the single photon in high dimensions is experimentally realized to implement a compiled version of Shor’s algorithm on a single photon. Our work demonstrates the powerful information-processing capacity of a high-dimensional quantum system for complex quantum information tasks.

关键词： Hyperentanglement Optical quantum information processing Photonics quantum algorithms quantum communication quantum computation quantum cryptography Qudits

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On-Chip quantum Information Processing with Distinguishable Photons

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Physical Review Letters 2024年第15期132卷 150602-150602页

作者： Patrick Yard Alex E. Jones Stefano Paesani Alexandre Maïnos Jacob F. F. Bulmer Anthony Laing Quantum Engineering and Technology Laboratories School of Physics and Department of Electrical and Electronic Engineering University of Bristol Bristol United Kingdom Center for Hybrid Quantum Networks (Hy-Q) Niels Bohr Institute University of Copenhagen Blegdamsvej 17 DK-2100 Copenhagen Denmark

Multiphoton interference is at the heart of photonic quantum technologies. Arrays of integrated cavities can support bright sources of single photons with high purity and small footprint, but the inevitable spectral distinguishability between photons generated from nonidentical cavities is an obstacle to scaling. In principle, this problem can be alleviated by measuring photons with high timing resolution, which erases spectral information through the time-energy uncertainty relation. Here, we experimentally demonstrate that detection can be implemented with a temporal resolution sufficient to interfere photons detuned on the scales necessary for cavity-based integrated photon sources. By increasing the effective timing resolution of the system from 200 to 20 ps, we observe a 20% increase in the visibility of quantum interference between independent photons from integrated microring resonator sources that are detuned by 6.8 GHz. We go on to show how time-resolved detection of nonideal photons can be used to improve the fidelity of an entangling operation and to mitigate the reduction of computational complexity in boson sampling experiments. These results pave the way for photonic quantum information processing with many photon sources without the need for active alignment.

关键词： Integrated optics Optical quantum information processing Photonics quantum engineering quantum interference effects quantum optics

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Counterfactual Polarimetry of a Polarising Object

Counterfactual Polarimetry of a Polarising Object

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2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2022

作者： Hance, Jonte R. Rarity, John Quantum Engineering Technology Laboratories Department of Electrical and Electronic Engineering University of Bristol Woodland Road BristolBS8 1US United Kingdom

We extend counterfactual imaging to polarimetry of a polarising object. This allows imaging of these samples with far less absorbed energy - a key concern when imaging with high-frequency radiation. © 2022 The Au...

ISBN: (纸本)9798350350012

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Counterfactual Polarimetry of a Polarising Object

Counterfactual Polarimetry of a Polarising Object

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2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO/PR 2022

关键词： Polarimeters

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Polarimetry of a Polarising Object without Photon Interaction

Polarimetry of a Polarising Object without Photon Interactio...

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Nonlinear Photonics, NP 2022

We extend counterfactual, or exchange-free, imaging to the polarimetry of a polarising object. This allows imaging of these samples with far less absorbed energy - a key concern when imaging with high-frequency radiat... 详细信息

ISBN: (纸本)9781557528209

关键词： Polarimeters

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Interaction-Free Polarimetry of a Polarising Object

Interaction-Free Polarimetry of a Polarising Object

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quantum 2.0, quantum 2022

ISBN: (纸本)9781957171111

关键词： Polarimeters

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Mid-infrared Qubit Entanglement in Silicon

Mid-infrared Qubit Entanglement in Silicon

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quantum 2.0, quantum 2024 in quantum 2.0 Conference and Exhibition

作者： Currie, Sebastian Gears, Samuel Sulway, Dominic Silverstone, Joshua Big Photon Lab H.H Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol BS8 1FD United Kingdom Quantum Engineering Centre for Doctoral Training H. H. Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol BS8 1FD United Kingdom Quantum Engineering Technology Laboratories University of Bristol Bristol United Kingdom

We demonstrate the first instance of integrated quantum entanglement in the mid-infrared, using tailored Silicon photon pair sources, filters and detectors. We show a 6 sigma violation of the CHSH inequality with S=2.... 详细信息

ISBN: (纸本)9781557525185

关键词： quantum entanglement

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