Article
Chemistry, Physical
Jian Chen, Jinjin Li, Xiaolong Xu, Zhenyu Wang, Siming Guo, Zheng Jiang, Huifang Gao, Qing Zhong, Yuan Zhong, Jiusun Zeng, Xueshen Wang
Summary: Bismuth (Bi) films have been found to be a superior absorber for X-ray transition edge sensors (TESs) compared to gold (Au), with a higher absorption rate and unique crystal structure.
Article
Physics, Applied
Ruslan Hummatov, Adriana E. Lita, Tannaz Farrahi, Negar Otrooshi, Samuel Fayer, Matthew J. Collins, Malcolm Durkin, Douglas Bennett, Joel Ullom, Richard P. Mirin, Sae Woo Nam
Summary: Photon-number resolving transition-edge sensors (TESs) with near unity system detection efficiency enable novel approaches to quantum computing, such as heralding robust Gottesman-Kitaev-Preskill qubit states. Adding a small amount of gold between the tungsten film and silicon substrate can increase thermal conductance and reduce detector recovery time. In this report, the operation of the TES illuminated by a heavily attenuated pulsed laser running at 1 MHz repetition rate is demonstrated, and the limits to adding gold to speed up device recovery times using a higher bandwidth readout system are examined. The best performance was achieved by combining a 15 x 15 μm² tungsten TES with 5 μm³ of gold, resulting in a recovery time faster than 250 ns and an energy resolution of 0.25 eV full-width at half maximum at 0.8 eV photon energy.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Benjamin Puzantian, Yasser Saleem, Marek Korkusinski, Pawel Hawrylak
Summary: We present a theory of the electronic properties of quasi two-dimensional quantum dots made of topological insulators. The effects of compressive strain and topological phase transitions are studied, which may enable the design of strain-driven quantum strain sensors.
Article
Optics
Siyi Zhou, Wenwu Deng, Huatang Tan
Summary: In this paper, the authors study the steady-state quantum entanglement and steering in an open Dicke model considering cavity dissipation and individual atomic decoherence. They find that the presence of decohering environments can improve entanglement and steering in both normal and superradiant phases. They also observe that individual atomic spontaneous emission leads to the appearance of steering, but the steering in two directions cannot be simultaneously generated.
Article
Engineering, Electrical & Electronic
E. Ferri, B. Alpert, M. Balata, D. T. Becker, D. A. Bennett, M. Borghesi, M. De Gerone, R. Dressler, M. Faverzani, M. Fedkevych, J. Fowler, G. Gallucci, J. D. Gard, F. Gatti, A. Giachero, G. C. Hilton, U. Koester, M. Lusignoli, J. A. B. Mates, E. Maugeri, E. Nisi, A. Nucciotti, G. Pessina, S. Ragazzi, C. D. Reintsema, M. Ribeiro-Gomes, D. R. Schmidt, D. Schumann, D. S. Swetz, J. N. Ullom, L. R. Vale
Summary: One of the major challenges in particle physics and astrophysics is determining the absolute neutrino mass scale. Microware frequency readout provides an effective technique to measure the energy released in a nuclear decay involving neutrinos, allowing researchers to evaluate the effective neutrino mass.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Chemistry, Physical
Ying Xing, Yiyu Liu, Pu Yang, Jun Ge, Longxin Pan, Junyan Wang, Shichao Qi, Yi Liu, Jian Wang
Summary: Researchers reported the magnetic field induced superconductor-metal transition phenomenon in 4Ha-TaSe2 nanodevices, and observed the quantum Griffiths singularity in its thin films. As the thickness of the nanodevices increased, the signature of magnetoresistance crossing region could hardly be detected, revealing the thickness dependence of the transition phenomenon.
Article
Physics, Applied
Johannes Staguhn, Ari Brown, Shannon Duff, Gene Hilton, Elmer Sharp, Felipe Colazo, Nicholas Costen, Samuel H. Moseley, Frederick Wang, Edward Wollack, Sang Yoon
Summary: The far-infrared band is well-suited for studying interstellar medium and star formation, and future missions require robust and efficient detector arrays. We have developed a new architecture to meet these requirements.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2022)
Article
Chemistry, Analytical
Ali Passian, Gilles Buchs, Christopher M. Seck, Alberto M. Marino, Nicholas A. Peters
Summary: The concept of an edge quantum computing (EQC) simulator is presented, which integrates elements from both quantum technologies and edge computing to allow studies of quantum edge applications. This simulator is envisioned to address the increasing demand for more sensitive and precise sensors that can operate faster at lower power consumption, generating larger and denser datasets.
Review
Physics, Applied
Yong-Hamb Kim, Sang-Jun Lee, Byeongsu Yang
Summary: Superconducting detectors are crucial in experimental astroparticle physics for their potential in detecting dark matter and neutrinoless double beta decay. This review focuses on the history, significance, and challenges of these research areas, as well as a comprehensive overview of various types of superconducting detectors and leading experiments.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Pei-Sa Ma, Hong-Fan Zhang, Xingxiang Zhou
Summary: By measuring the intensity variation of the reflected wave, we can accurately align an optical fiber to a quantum photon detector. This novel technique is simple, cost-effective, and accessible to a wider community.
Article
Optics
Na Wang, Meihong Wang, Caixing Tian, Xiaowei Deng, Xiaolong Su
Summary: This article demonstrates the quantum steering swapping of Gaussian entangled states in a lossy channel and achieves the steerability of a new Gaussian state located in distant nodes by choosing the optimum gains in classical channels. This work is of great importance for the applications of quantum steering in asymmetric quantum information processing.
LASER & PHOTONICS REVIEWS
(2023)
Article
Multidisciplinary Sciences
Sachin Yadav, Vinay Kaushik, M. P. Saravanan, R. P. Aloysius, V Ganesan, Sangeeta Sahoo
Summary: Disorder induced phase slip events were observed in current voltage characteristics of two-dimensional TiN thin films produced through robust substrate mediated nitridation technique. The critical temperature and resistive steps in the characteristics were found to vary strongly with annealing temperature and thickness, indicating the robustness of the synthesis process in fabricating disordered nitride-based superconductor.
SCIENTIFIC REPORTS
(2021)
Review
Physics, Multidisciplinary
Xinyu Wu, Qing Yu, Yongcheng He, Jianshe Liu, Wei Chen
Summary: This study summarizes various types of multiplexing technologies based on SQUIDs, including time-division multiplexing, code-division multiplexing, frequency-division multiplexing, and microwave SQUID multiplexing. The advances and limitations of each technology are also discussed.
Article
Physics, Multidisciplinary
Xu Da, Zhong Qing, Cao Wen-Hui, Wang Xue-Shen, Wang Shi-Jian, Li Jin-Jin, Liu Jian-She, Chen Wei
Summary: This paper presents the development of a second-order gradiometric cross-coupled SQUID current sensor for TES applications, with a structure designed to meet the requirements of TES detectors. The sensor, based on Nb/Al-AlOx/Nb Josephson junction, has been successfully fabricated on a silicon wafer and shows excellent performance in terms of flux-to-voltage transfer coefficient, current sensitivity, and noise levels. Further improvements are planned to enhance the input sensitivity, reduce noise levels, and meet additional requirements for TES applications.
ACTA PHYSICA SINICA
(2021)
Article
Quantum Science & Technology
Wen Wen Hu, Ri-Gui Zhou, Gao Feng Luo
Summary: This paper proposes two conclusive multiparty quantum state sharing protocols in the amplitude damping channel, for sharing an arbitrary unknown single-qubit state and single-qutrit state respectively. The analysis shows that the successful probability of receiver recovering the secret quantum information is determined by the smallest absolute value of the coefficients characterizing the quantum channel.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Quantum Science & Technology
Joseph Ho, George Moreno, Samurai Brito, Francesco Graffitti, Christopher L. Morrison, Ranieri Nery, Alexander Pickston, Massimiliano Proietti, Rafael Rabelo, Alessandro Fedrizzi, Rafael Chaves
Summary: Efficient distributed computing can benefit from quantum communication complexity problems, as quantum resources offer superior solutions compared to classical ones. By relating quantum communication complexity tasks to non-locality, we gain insights into fundamental quantum mechanics from an information-theoretic perspective.
NPJ QUANTUM INFORMATION
(2022)
Article
Multidisciplinary Sciences
Berke Vow Ricketti, Erik M. Gauger, Alessandro Fedrizzi
Summary: This study revisits the historic calculations of sunlight coherence and provides values for the coherence time of atmospherically filtered light. The results show that the coherence time of atmospherically filtered sunlight is 1.12 +/- 0.04 fs, and the coherence time in a chlorophyll analogous filtered case is 4.87 +/- 0.21 fs.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Christopher L. Morrison, Francesco Graffitti, Peter Barrow, Alexander Pickston, Joseph Ho, Alessandro Fedrizzi
Summary: Frequency encoding is becoming increasingly attractive for quantum information protocols due to its larger Hilbert spaces and enhanced resilience to noise. This study presents a single-pass source of discrete frequency-bin entanglement that does not require filtering or a resonant cavity. The researchers used a domain-engineered nonlinear crystal to generate an eight-mode frequency-bin entangled source at telecommunication wavelengths.
Article
Physics, Multidisciplinary
Cen-Xiao Huang, Xiao-Min Hu, Yu Guo, Chao Zhang, Bi-Heng Liu, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, Nicolas Gisin, Cyril Branciard, Armin Tavakoli
Summary: In this study, we experimentally realized deterministic entanglement swapping based on quantum elegant joint measurements using hyperentanglement. We demonstrated the applications of these measurements by showcasing proof-of-principle violations of bilocal Bell inequalities and more stringent correlation criteria corresponding to full network nonlocality. Our results provide insights into the relevance of more general measurements in entanglement swapping scenarios.
PHYSICAL REVIEW LETTERS
(2022)
News Item
Physics, Multidisciplinary
Andrew G. G. White
Summary: A clever experiment with a photonic circuit has demonstrated three-dimensional non-Abelian quantum behavior, providing an experimental testbed for field and gauge theories.
Article
Physics, Multidisciplinary
Qiu-Cheng Song, Travis J. Baker, Howard M. Wiseman
Summary: The Einstein, Podolsky and Rosen (EPR) phenomenon refers to the ability of one party to steer the quantum system of another party into two distinct ensembles of pure states. This phenomenon can be demonstrated even with mixed states, as long as they are pure enough and different enough. Specifically, if the first measurement setting yields an ensemble comprising two pure states, EPR-steering can be shown with any other measurement setting.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
L. A. Ostrowski, T. J. Baker, S. N. Saadatmand, H. M. Wiseman
Summary: The Heisenberg limit restricts the laser coherence T, which is the number of photons in the most populated mode of the laser beam, to be proportional to the fourth power of the number of excitations inside the laser. We extend the previous proof of this upper bound scaling by relaxing the requirement of Poissonian photon statistics (i.e., Mandel's Q = 0). Furthermore, we demonstrate that the relationship between T and sub-Poissonianity (Q < 0) is win-win rather than a tradeoff. In both regular (non-Markovian) pumping with semiunitary gain (allowing Q -> -1) and random (Markovian) pumping with optimized gain, T is maximized when Q is minimized.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Julian Wechs, Cyril Branciard, Ognyan Oreshkov
Summary: This paper introduces the concept of time-delocalised quantum subsystems and shows how a process that violates causal relationships can be realized in standard quantum theory. By studying a specific tripartite classical process and its realization on time-delocalised subsystems, the authors discuss the assumptions underlying causal inequalities and argue that they are a meaningful concept to demonstrate the absence of a definite causal order between variables.
NATURE COMMUNICATIONS
(2023)
Article
Quantum Science & Technology
Aniket Rath, Vittorio Vitale, Sara Murciano, Matteo Votto, Jerome Dubail, Richard Kueng, Cyril Branciard, Pasquale Calabrese, Benoit Vermersch
Summary: The operator entanglement (OE) is a key quantifier of the complexity of a reduced density matrix. By performing a new data analysis of experimental results, we obtain the first experimental estimation of the OE in a quantum many-body system. The obtained OE displays the expected entanglement barrier in large systems.
Article
Physics, Multidisciplinary
Marco Fellous-Asiani, Raphael Mothe, Lea Bresque, Hippolyte Dourdent, Patrice A. Camati, Alastair A. Abbott, Alexia Auffeves, Cyril Branciard
Summary: Quantum mechanics allows for superposition of processes, resulting in a lack of causal structure. The implementation of the quantum switch has been challenged due to the multiple implementations of operations A and B, which only simulate indefinite causal order instead of actually implementing it. However, by limiting the energy available for operations, we can distinguish between processes with different numbers of operations.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Optics
L. A. Ostrowski, T. J. Baker, S. N. Saadatmand, H. M. Wiseman
Summary: Recently, a study has shown that a laser can produce a stationary beam with enhanced coherence by storing a higher number of excitations within the laser. This finding challenges the traditional limits of laser coherence and introduces new laser models with different parameterizations. The study also explores the influence of these parameters on the coherence and photon statistics of the laser beams, revealing distinct regimes based on the parameter values. The optimal parameter value is found to be approximately 4.15 instead of the conventional value of 4.
Article
Optics
Hongting Song, Areeya Chantasri, Behnam Tonekaboni, Howard M. Wiseman
Summary: Spectator qubits (SQs) are used to reduce noise in inaccessible data qubits. SQs, which are more sensitive to noise, are measured frequently and the results are rarely used to correct data qubits. A Bayesian method utilizing complex linear maps is introduced to address dephasing from random telegraph noise, which results in an optimally adaptive measurement and control protocol. The decoherence rate suppression is quadratic in the sensitivity of the SQ, demonstrating that the SQ paradigm works well in the appropriate regime.
Article
Quantum Science & Technology
Howard M. Wiseman, Aephraim M. Steinberg, Matin Hallaji
Summary: This article presents a method for measuring weak values using strong coherent states, eliminating the difficulties and slow rate associated with preparing single photons.
AVS QUANTUM SCIENCE
(2023)
Article
Optics
Qiu-Cheng Song, Travis J. Baker, Howard M. Wiseman
Summary: This study investigates quantum steering in a network scenario involving n parties, introducing different scenarios and analyzing the necessary steering criteria for different measurement settings. It finds that using a semi-random pair entanglement construction, one party can steer every other party for arbitrarily large n.
Article
Optics
Dat Thanh Le, Marcelo P. Almeida, Nguyen Ba An
Summary: In this paper, we propose a resource-efficient scheme for certifying arbitrary photon Fock states by utilizing second-order nonlinearity. Our scheme achieves a high certification fidelity and is applicable in the fields of quantum communication and quantum metrology.
