Article
Optics
Seongjin Hong, Junaid ur Rehman, Yong-Su Kim, Young-Wook Cho, Seung-Woo Lee, Su-Yong Lee, Hyang-Tag Lim
Summary: This study investigates a strategy to achieve the best practical sensitivity by optimizing both mode-amplitudes of multi-mode N00N states and a split ratio of a multi-mode beam splitter, and experimentally demonstrates its effectiveness.
LASER & PHOTONICS REVIEWS
(2022)
Article
Multidisciplinary Sciences
Osian Wolley, Thomas Gregory, Sebastian Beer, Takafumi Higuchi, Miles Padgett
Summary: Classical light sources and quantum light sources exhibit different performances in imaging systems. By using a photon counting camera, we recorded an image formed from photon-pair events, achieving a greater contrast than possible using classical light sources. This experimental result suggests the potential advantages of using photon counting cameras in quantum imaging schemes.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Nathan Shettell, William J. Munro, Damian Markham, Kae Nemoto
Summary: Noise is the greatest obstacle in quantum metrology that limits achievable precision and sensitivity. Quantum error correction can be beneficial, but with current technological limitations, achieving the Heisenberg limit remains challenging. Improvements in factors such as repetition frequency are needed to reliably reach the desired precision level.
NEW JOURNAL OF PHYSICS
(2021)
Article
Engineering, Multidisciplinary
Aaron Z. Goldberg, Khabat Heshami
Summary: We demonstrate that the quantum advantage relative to classical probe light can still be maintained even when the detectors fire due to dark counts and other spurious events. We show in detail how the quantum advantage depends on dark counts and increases with Fock-state-probe strength. These results are especially pertinent as the present capabilities of PNRDs are being dramatically improved.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Shuo Li, Wenchao Li, Vladislav V. Yakovlev, Allison Kealy, Andrew D. Greentree
Summary: Achieving a fundamental understanding of biological pathways requires minimally invasive nanoscopic optical resolution imaging. In this study, a new approach is proposed by utilizing quantum measurements of photon number distributions to determine the number and probability of emission from single-photon emitters. This technique has great potential in quantum optical imaging with nanoscopic resolution.
Article
Engineering, Electrical & Electronic
Kee Suk Hong, Hee-Jin Lim, Dong Hoon Lee, In-Ho Bae, Kwang-Yong Jeong, Christoph Becher, Sejeong Kim, Igor Aharonovich
Summary: Single-photon sources based on single emitters are highly interesting for various applications and have been realized using different materials. Common factors related to relaxation times of internal states indirectly affect the photon number stability. GaN emitters demonstrate higher stability due to faster relaxation times compared to hBN emitters, but hBN emitters have higher photon generation rates. Repeatable radiant flux measurements of a bright hBN single-photon emitter for a wide range of fluxes have been demonstrated.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Multidisciplinary Sciences
M. Koperski, K. Pakula, K. Nogajewski, A. K. Dabrowska, M. Tokarczyk, T. Pelini, J. Binder, T. Fas, J. Suffczynski, R. Stepniewski, A. Wysmolek, M. Potemski
Summary: The study demonstrates quantum emission capabilities from boron nitride structures, with polycrystalline BN films and hBN crystals displaying quantum emission characteristics. The findings show that controlling background luminescence can lead to antibunching effects, while exploring the feasibility of using flexible and transparent substrates to support quantum emitters.
SCIENTIFIC REPORTS
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Kai Higashigaito, Andre Euler, Matthias Eberhard, Thomas G. Flohr, Bernhard Schmidt, Hatem Alkadhi
Summary: Intra-individual comparison of abdominal PCD-CT showed significantly higher CNR in VMI at 50 keV with similar subjective image quality compared to EID-CT at the same radiation dose.
ACADEMIC RADIOLOGY
(2022)
Article
Quantum Science & Technology
Masahito Hayashi, Zi-Wen Liu, Haidong Yuan
Summary: This article presents a comprehensive and rigorous study on the attainability of strong global notions of Heisenberg scaling in the fundamental problem of quantum metrology in noisy environments. Two useful notions of Heisenberg scaling based on average estimation error and limiting distribution of estimation error are defined. The main result shows that for standard phase damping noise, an O(n (-1)) noise rate is necessary and sufficient for achieving global Heisenberg scaling. The study also proposes a practically more friendly adaptive protocol using only one-qubit memory to achieve global Heisenberg scaling.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Quantum Science & Technology
Chenlu Wang, Xuegang Li, Huikai Xu, Zhiyuan Li, Junhua Wang, Zhen Yang, Zhenyu Mi, Xuehui Liang, Tang Su, Chuhong Yang, Guangyue Wang, Wenyan Wang, Yongchao Li, Mo Chen, Chengyao Li, Kehuan Linghu, Jiaxiu Han, Yingshan Zhang, Yulong Feng, Yu Song, Teng Ma, Jingning Zhang, Ruixia Wang, Peng Zhao, Weiyang Liu, Guangming Xue, Yirong Jin, Haifeng Yu
Summary: A breakthrough in fabricating a long lifetime transmon qubit was reported, using tantalum films as the base superconductor with a dry etching process. The transmon qubits achieved a best T-1 lifetime of 503 μs, outperforming those fabricated with niobium and aluminum. The stable and highly anisotropic dry etching process of tantalum film shows promise for fabricating medium- or large-scale superconducting quantum circuits with longer lifetimes, meeting the requirements for practical quantum computers.
NPJ QUANTUM INFORMATION
(2022)
Article
Computer Science, Artificial Intelligence
Quoc Chuong Nguyen, Le Bin Ho, Lan Nguyen Tran, Hung Q. Nguyen
Summary: This paper introduces a QVM named Qsun that supports VQAs and has implemented quantum differentiable programming for gradient optimization. It reports tests on quantum linear regression and quantum neural networks, exploring practical applications of QML on quantum virtual machines.
MACHINE LEARNING-SCIENCE AND TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Kai Sun, Zheng-Hao Liu, Yan Wang, Ze-Yan Hao, Xiao-Ye Xu, Jin-Shi Xu, Chuan-Feng Li, Guang-Can Guo, Alessia Castellini, Ludovico Lami, Andreas Winter, Gerardo Adesso, Giuseppe Compagno, Rosario Lo Franco
Summary: This study experimentally demonstrates the different contributions to quantum coherence from identical and nonidentical particles, and proves that independent indistinguishable particles can serve as controllable resources of coherence and entanglement.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Review
Chemistry, Multidisciplinary
Andreas Pfenning, Sebastian Krueger, Fauzia Jabeen, Lukas Worschech, Fabian Hartmann, Sven Hoefling
Summary: Optical quantum information science and technologies require the ability to generate, control, and detect single or multiple quanta of light. Superconducting nanowire single-photon detectors and single-photon avalanche diodes are currently the top performers in this field, but other promising devices are emerging. This review article focuses on a specific alternative single-photon detector - the resonant tunneling diode - and discusses its advantages, limitations, and potential improvements.
Article
Optics
Benjamin Crockett, James van Howe, Nicola Montaut, Roberto Morandotti, Jose Azana
Summary: A simple and practical method based on electro-optic gating is shown to improve the temporal resolution of single-photon detection significantly. The method can also be applied to biphotons to achieve higher resolution in joint detection delays.
LASER & PHOTONICS REVIEWS
(2022)
Article
Quantum Science & Technology
Artur Czerwinski
Summary: This article introduces a framework for entanglement characterization using time-resolved single-photon counting with measurement operators defined in the time domain. The approach is discussed in relation to photonic tomography, with considerations for timing uncertainty and Poisson noise on photon counts. Numerical testing on qubit quantum tomography and accuracy evaluation for polarization-entangled photon pairs are presented, quantified by figures of merit and plotted against time uncertainty.
QUANTUM INFORMATION PROCESSING
(2022)
Editorial Material
Physics, Applied
Alex S. Clark, Maria Chekhova, Jonathan C. F. Matthews, John G. Rarity, Rupert F. Oulton
APPLIED PHYSICS LETTERS
(2021)
Editorial Material
Physics, Multidisciplinary
Zhibo Hou, Qi Yin, Chao Zhang, Han-Sen Zhong, Guo-Yong Xiang, Chuan-Feng Li, Guang-Can Guo, Geoff J. Pryde, Anthony Laing
Summary: The experimental study demonstrates that measurements can be performed on qubits before they are prepared, with high fidelity. The protocol implemented requires some post-selection in this proof-of-principle implementation, but in general it is deterministic and does not require post-selection.
Article
Optics
Galan Moody, Volker J. Sorger, Daniel J. Blumenthal, Paul W. Juodawlkis, William Loh, Cheryl Sorace-Agaskar, Alex E. Jones, Krishna C. Balram, Jonathan C. F. Matthews, Anthony Laing, Marcelo Davanco, Lin Chang, John E. Bowers, Niels Quack, Christophe Galland, Igor Aharonovich, Martin A. Wolff, Carsten Schuck, Neil Sinclair, Marko Loncar, Tin Komljenovic, David Weld, Shayan Mookherjea, Sonia Buckley, Marina Radulaski, Stephan Reitzenstein, Benjamin Pingault, Bartholomeus Machielse, Debsuvra Mukhopadhyay, Alexey Akimov, Aleksei Zheltikov, Girish S. Agarwal, Kartik Srinivasan, Juanjuan Lu, Hong X. Tang, Wentao Jiang, Timothy P. McKenna, Amir H. Safavi-Naeini, Stephan Steinhauer, Ali W. Elshaari, Val Zwiller, Paul S. Davids, Nicholas Martinez, Michael Gehl, John Chiaverini, Karan K. Mehta, Jacquiline Romero, Navin B. Lingaraju, Andrew M. Weiner, Daniel Peace, Robert Cernansky, Mirko Lobino, Eleni Diamanti, Luis Trigo Vidarte, Ryan M. Camacho
Summary: Integrated photonics is crucial for the large-scale integration of quantum systems, enabling programmable quantum information processing, chip-to-chip networking, hybrid quantum system integration, and high-speed communications.
JOURNAL OF PHYSICS-PHOTONICS
(2022)
Article
Physics, Multidisciplinary
Xiaoqian Zhang, Maolin Luo, Zhaodi Wen, Qin Feng, Shengshi Pang, Weiqi Luo, Xiaoqi Zhou
Summary: The study introduces a machine-learning-based method for evaluating quantum state fidelity, which is more flexible and efficient compared to other methods. This approach is applicable to arbitrary quantum states and can achieve high-precision fidelity prediction with fewer measurement settings.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Sergei Slussarenko, Morgan M. Weston, Lynden K. Shalm, Varun B. Verma, Sae-Woo Nam, Sacha Kocsis, Timothy C. Ralph, Geoff J. Pryde
Summary: This study demonstrates successful channel correction for long-distance quantum communication, improving the transmission performance of entangled channels without relying on post-processing or post-selection of data.
NATURE COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Sergei Slussarenko, Dominick J. Joch, Nora Tischler, Farzad Ghafari, Lynden K. Shalm, Varun B. Verma, Sae Woo Nam, Geoff J. Pryde
Summary: Violating a nonlocality inequality is key to remote quantum information tasks and fundamental tests of quantum physics. In this study, the completion of the quantum steering nonlocality task was demonstrated using optical vector vortex states for transmitting photons, closing the detection loophole. This important breakthrough opens up possibilities for high-efficiency encoding, free-space and satellite-based secure quantum communication devices, and device-independent protocols.
NPJ QUANTUM INFORMATION
(2022)
Article
Physics, Multidisciplinary
Alexandre Belsley, Euan J. Allen, Animesh Datta, Jonathan C. F. Matthews
Summary: This study demonstrates that quantum states of light can improve the precision of absorption estimation by utilizing interference and resonant enhancement effects. In all-pass ring resonators, coherent-state probes outperform any quantum probe single-pass strategy, even when normalized by the mean input photon number. Under optimal conditions, coherent-state probes in all-pass ring resonators perform equally well as arbitrarily bright pure single-mode squeezed probes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Alexandre Belsley, Jonathan C. F. Matthews
Summary: The concentration of a chiral solution is a key parameter that can be estimated to high precision using circular birefringence or circular dichroism. By using the quantum Fisher information formalism, researchers have found that bright-polarization squeezed state probes provide a quantum advantage over classical strategies, resulting in four-fold precision enhancement.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
D. A. Payne, J. C. F. Matthews
Summary: We present a photonic temperature sensor that shows improved performance in both broad- and narrow-bandwidth optical measurements. The device comprises a Mach-Zehnder interferometer with arms made from silicon and silicon nitride waveguides with different thermo-optic coefficients. The use of distinct layers in the fabrication allows for compact sensing of local temperatures in integrated photonic components. The sensor's dual layers also enable overlaying of the interferometer arms. We measure a sensitivity of 324 pm/K, which is over three times higher than a silicon waveguide-based asymmetric Mach-Zehnder. Additionally, we introduce a useful figure of merit for side-of-fringe measurement and demonstrate the competitiveness of our device in this regard.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Dominick J. Joch, Sergei Slussarenko, Yuanlong Wang, Alex Pepper, Shouyi Xie, Bin-Bin Xu, Ian R. Berkman, Sven Rogge, Geoff J. Pryde
Summary: This research demonstrates the generation of certified randomness based on quantum nonlocality, which can provide proof of randomness even in the presence of untrusted devices. It enables the generation of certified randomness in environmental regimes where fully device-independent protocols are not feasible.
Article
Optics
Maolin Luo, Xiaoqian Zhang, Xiaoqi Zhou
Summary: This paper demonstrates a proof-of-principle optical experiment to implement the quantum gate verification (QGV) scheme. The experimental results show that the QGV method can achieve the same results as the standard quantum process tomography method with fewer samples when evaluating the single-qubit quantum gates.
Proceedings Paper
Engineering, Electrical & Electronic
Geoff J. Pryde, Kok-Wei Bong, Anibal Utreras-Alarcon, Farzad Ghafari, Yeong-Cherng Liang, Nora Tischler, Eric Cavalcanti, Howard M. Wiseman
Summary: The Wigner's friend paradox sheds light on the quantum measurement problem and through a series of entangled-photon experiments, a new and more stringent no-go theorem was proposed, with stronger constraints than Bell's theorem.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Optics
N. Samantaray, J. C. F. Matthews, J. G. Rarity
Summary: An experimentally realizable model has been devised to generate twin-beam states with varied photon statistics, and their usefulness in loss measurement has been studied. The incorporation of photon subtraction operation shows improved performance in loss estimations, with unexpected advantages in certain operating regimes. Comparative study of estimators has also been conducted to find the best measurement method for loss estimations.
Article
Optics
Jake Biele, Sabine Wollmann, Joshua W. Silverstone, Jonathan C. F. Matthews, Euan J. Allen
Summary: Research shows that quantum fluctuations can affect measurement precision in absorption spectroscopy, and increasing probe power can improve precision but is often constrained by sample saturation. By optimizing the probe-sample strategy, it was found that optimal probe powers always fall within the saturation regime, and using amplitude-squeezed light can provide precision close to 85% of the quantum limit.
Article
Physics, Multidisciplinary
Xing Ze-Yu, Li Zhi-Hao, Feng Tian-Feng, Zhou Xiao-Qi
Summary: This paper proposes a high-speed calibration method in integrated photonics, which achieves exponential acceleration by linearly increasing calibration time with the number of cascades. The method involves calibrating phase shifters one by one via two-dimensional scanning, significantly reducing the calibration time and improving fidelity.
ACTA PHYSICA SINICA
(2021)