Article
Physics, Multidisciplinary
Evan Meyer-Scott, Nidhin Prasannan, Ish Dhand, Christof Eigner, Viktor Quiring, Sonja Barkhofen, Benjamin Brecht, Martin B. Plenio, Christine Silberhorn
Summary: This study demonstrates the scalable generation of multiphoton entangled states by utilizing active feed-forward and multiplexing, increasing the generation rates and facilitating practical multiphoton protocols for photonic quantum technologies.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Mikka Stasiuk, Felix Hufnagel, Xiaoqin Gao, Aaron Z. Goldberg, Ebrahim Karimi, Khabat Heshami, Frederic Bouchard
Summary: This paper discusses two protocols used in quantum key distribution, the round-robin differential phase shift protocol (RRDPS) and high-dimensional (HD) QKD, and explores the method of extending RRDPS QKD to an arbitrarily large encoding alphabet and its implications for security.
Article
Physics, Multidisciplinary
Shengshuai Liu, Yanbo Lou, Yingxuan Chen, Jietai Jing
Summary: This letter proposes and demonstrates a measurement-free all-optical entanglement swapping scheme, which utilizes a high-gain parametric amplifier based on the four-wave mixing process to achieve Bell-state measurement without detection. This scheme provides an all-optical paradigm for implementing entanglement swapping and paves the way for constructing a measurement-free all-optical broadband quantum network.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Rishi N. Patel, Timothy P. McKenna, Zhaoyou Wang, Jeremy D. Witmer, Wentao Jiang, Raphael Van Laer, Christopher J. Sarabalis, Amir H. Safavi-Naeini
Summary: Researchers have successfully performed single phonon addition and subtraction on a room-temperature mechanical oscillator using a cavity-optomechanical approach. Through strong quantum measurement and a tomography scheme, they observed highly non-Gaussian phase-space distributions and confirmed the counterintuitive doubling of the mean phonon number resulting from phonon addition and subtraction.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Xiaoqin Gao, Yingwen Zhang, Alessio D'Errico, Khabat Heshami, Ebrahim Karimi
Summary: The experimental demonstration of high-speed measurement and characterization of two-photon interference using a time tagging camera opens up possibilities for practical applications in quantum sensing and communication.
Article
Optics
Rocco Duquennoy, Maja Colautti, Ramin Emadi, Prosenjit Majumder, Pietro Lombardi, Costanza Toninelli
Summary: Scalability and miniaturization are features of solid-state platforms for photonic quantum technologies, but achieving two-photon interference from distinct emitters on a chip remains a challenge. Molecular single-photon sources provide a promising platform for quantum interference experiments by tuning the emission frequency.
Article
Optics
N. Fayard, I. Ferrier-Barbut, A. Browaeys, J. -J Greffet
Summary: This work proposes a protocol that bypasses the limitation of subradiant states by using a one-dimensional chain of N three-level atoms in a V-shaped configuration. The chain behaves as a time-varying metamaterial, enabling absorption, storage, and on-demand emission in a spectrally and spatially controlled mode. In the nonlinear regime, the transfer of doubly excited states from superradiant to subradiant states is demonstrated, providing a possible route for the optical characterization of their entanglement.
Article
Quantum Science & Technology
Yuichi Sano
Summary: Blind quantum computation protocol is a method to protect calculation information by delegating to someone who has a quantum computer. Existing protocols either require users to have quantum capabilities or impose limits on server-to-server communication. We prove that these two protocols are equivalent.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Optics
Xunwei Xu, Yanjun Zhao, Hui Wang, Aixi Chen, Yu-Xi Liu
Summary: This paper introduces a generic method to achieve a significant difference between the stimulated emission and absorption coefficients of two nondegenerate energy levels through a combination of synthetic magnetism and reservoir engineering, referred to as a nonreciprocal transition. A specific implementation using a cyclic three-level atom system demonstrates this nonreciprocal transition effect.
PHOTONICS RESEARCH
(2021)
Article
Computer Science, Artificial Intelligence
Danel Arias, Ignacio Garcia Rodriguez de Guzman, Moises Rodriguez, Erik B. Terres, Borja Sanz, Jose Gaviria de la Puerta, Iker Pastor, Agustin Zubillaga, Pablo Garcia Bringas
Summary: Quantum computing has become a rapidly evolving reality rather than a promise of the future. Advances in quantum hardware bring computational possibilities that were once only theoretical closer to reality. However, there are emerging security vulnerabilities that may hinder the progress and development of quantum computing in industry. This article aims to review the emerging artifacts in quantum computing and propose a roadmap for secure quantum software development.
Review
Chemistry, Analytical
Silong Li, Yuxiang Chen, Lin Chen, Jing Liao, Chanchan Kuang, Kuanching Li, Wei Liang, Naixue Xiong
Summary: Cryptography plays a crucial role in our daily lives, ensuring information confidentiality, integrity verification, authentication, and more. With the rise of quantum computing, traditional encryption methods are becoming vulnerable. To defend against quantum computer attacks, methods like quantum key distribution and post-quantum encryption algorithms have been developed. In this study, a comprehensive review of post-quantum encryption algorithms from the perspective of traditional cryptography is conducted, exploring concepts, development background, and specifically studying the Kyber algorithm. The achievements, challenges, outstanding issues, and future predictions in this emerging field are summarized.
Article
Optics
Yingwen Zhang, Duncan England, Andrei Nomerotski, Benjamin Sussman
Summary: In this work, spectral-temporal correlation measurements of the Hong-Ou-Mandel interference effect were demonstrated using a spectrometer based on a photon-counting camera. The setup offers high resolution and flexibility, allowing for efficient gathering of spectral and temporal information from a HOM interferometer.
Article
Optics
Jun Xin, Ge LI
Summary: In this paper, a remote switch for Schrodinger's cat state is proposed, and an approximate cat state is demonstrated using nonlocal correlations. The hybrid projective measurement is used to manipulate the size and parity of the generated cat state. This remote switch opens up new ideas for subsequent protocols.
Article
Computer Science, Information Systems
Maryam Shabbir, Fahad Ahmad, Ayesha Shabbir, Saad Awadh Alanazi
Summary: This paper aims to develop a computer system with self-learning, management, inherent security, rigorous, and reliable authentication capabilities through the collaboration of cognitive computing, quantum computing, and cyber security, in order to ensure the security of nuclear command and control centers.
JOURNAL OF KING SAUD UNIVERSITY-COMPUTER AND INFORMATION SCIENCES
(2022)
Article
Physics, Multidisciplinary
S. Sempere-Llagostera, R. B. Patel, I. A. Walmsley, W. S. Kolthammer
Summary: Gaussian boson sampling is a concept in quantum computing that involves drawing samples from a nonclassical Gaussian state using photon-number resolving detectors. In this study, we experimentally implement Gaussian boson sampling using a time-bin encoded interferometer and find improvements in searching for dense subgraphs in a graph.
Article
Quantum Science & Technology
Guilherme L. Zanin, Michael Antesberger, Maxime J. Jacquet, Paulo H. Souto Ribeiro, Lee A. Rozema, Philip Walther
Summary: Maxwell's Demon is at the heart of the relationship between quantum information processing and thermodynamics; photonic experiments offer great potential for exploring new regimes in quantum thermodynamics.
Article
Engineering, Electrical & Electronic
Alessandro Trenti, Martin Achleitner, Florian Prawits, Bernhard Schrenk, Hauke Conradi, Moritz Kleinert, Alfonso Incoronato, Francesco Zanetto, Franco Zappa, Ilaria Di Luch, Ozan Cirkinoglu, Xaveer Leijtens, Antonio Bonardi, Cedric Bruynsteen, Xin Yin, Christian Kiessler, Harald Herrmann, Christine Silberhorn, Mathieu Bozzio, Philip Walther, Hannah C. Thiel, Gregor Weihs, Hannes Huebel
Summary: This article presents the results of the Quantum Technology Flagship project UNIQORN in the field of integrated photonics for quantum communication applications. Different integration platforms, including indium phosphide, polymer, and CMOS-compatible silicon platforms, were used to manufacture components and sub-systems for quantum communication devices. The indium phosphide platform was used to produce a transmitter chip for quantum key distribution, while the polymer platform was utilized for engineering non-classical light sources. Additionally, a quantum random number generator and a transimpedance amplifier based on gallium arsenide high electron mobility transistors were also fabricated.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Zhu-Bo Wang, Chenyue Gu, Xin-Xin Hu, Ya-Ting Zhang, Ji-Zhe Zhang, Gang Li, Xiao-Dong He, Xu-Bo Zou, Chun-Hua Dong, Guang-Can Guo, Chang-Ling Zou
Summary: In this study, the dynamics of single atoms in a modified optical dipole trap with a backward propagating dipole trap beam were experimentally investigated. The collision rate between two atoms was changed by six times. The theoretical model predicts high probabilities of few-atom loading rates under appropriate experimental conditions. This work provides an alternative approach for controlling the dynamics of a few atoms in a dipole trap and studying the collective quantum optical effects of few atoms.
Article
Optics
P. Schiansky, T. Stroemberg, D. Trillo, V. Saggio, B. Dive, M. Navascues, P. Walther
Summary: In quantum mechanics, the reversibility of time evolution is based on the unitary nature. Recent experiments have demonstrated protocols for reverting unknown unitaries even in the case of unknown interactions with the target system, although these protocols are probabilistic. In this study, we show that quantum physics allows for deterministic time-reversal by taking advantage of the non-commuting nature of quantum operators. We present a recursive protocol with an arbitrarily high success probability for two-level quantum systems and achieve an average rewinding fidelity of over 95% using a photonic platform. Our protocol, which requires no knowledge of the quantum process to be rewound, is optimal in its running time and brings quantum rewinding into practical relevance.
Article
Education & Educational Research
Tao Tu, Chuan-Feng Li, Jin-Shi Xu, Guang-Can Guo
Summary: In this study, we investigate the use of delta functions in solving problems in the context of quantum mechanics. We analyze students' solutions and conduct interviews to uncover the difficulties they encounter. Common challenges include expressing position eigenstates using delta functions, expressing orthonormality of eigenfunctions with continuous spectra using delta functions, dealing with boundary conditions for delta function potentials, and calculating integrals involving delta functions. We also compare the similarities and differences in the use of delta functions in electrostatics and in quantum mechanics, and discuss the potential pedagogical implications of our findings.
PHYSICAL REVIEW PHYSICS EDUCATION RESEARCH
(2023)
Article
Physics, Multidisciplinary
Shreya Kumar, Daniel Bhatti, Alex E. Jones, Stefanie Barz
Summary: Multipartite entanglement is essential in optical quantum technologies. This study demonstrates a simple and versatile scheme to generate different types of genuine tripartite entangled states using only one experimental setup. By sending three photons through a three-port splitter and varying their internal states, the generation of tripartite W, G, and GHZ states is achieved with high fidelities.
NEW JOURNAL OF PHYSICS
(2023)
Review
Physics, Applied
Christophe Couteau, Stefanie Barz, Thomas Durt, Thomas Gerrits, Jan Huwer, Robert Prevedel, John Rarity, Andrew Shields, Gregor Weihs
Summary: In the context of quantum technologies, the generation and manipulation of single photons has become crucial for various applications. This review provides an overview of single-photon sources, their characterization, and their requirements for quantum communication and computing. It also discusses the milestones achieved so far and the challenges that still need to be addressed.
NATURE REVIEWS PHYSICS
(2023)
Review
Physics, Applied
Christophe Couteau, Stefanie Barz, Thomas Durt, Thomas Gerrits, Jan Huwer, Robert Prevedel, John Rarity, Andrew Shields, Gregor Weihs
Summary: With the development of photonic quantum technologies, single photons have become crucial for various applications such as quantum communication and quantum computing. This Review provides an overview of the applications of single photons in quantum metrology, biology, and experiments exploring the foundations of quantum physics. It discusses achieved milestones, remaining challenges, and future improvements, and concludes with a wish list for future single-photon sources.
NATURE REVIEWS PHYSICS
(2023)
Article
Optics
Xing-Yu Zhu, Tao Tu, Guang-Can Guo, Chuan-Feng Li
Summary: In this paper, a strategy for measuring the parity of two spin qubits using modulated pulses and a superconducting resonator as a detector is proposed. It is found that the distinction between spin-parity states can be achieved with high fidelity within a short measurement time, enabling the deterministic preparation of various spin entangled states. The method can also be applied to parity measurements and surface codes of multiple spin qubits. These results pave the way for fault-tolerant quantum computation with spin qubits.
Article
Optics
Daniel Bhatti, Stefanie Barz
Summary: Symmetric multiport beam splitters are versatile tools in optical quantum information processing. They can be used for studying multiparticle scattering, distinguishability and mixedness, and the generation of multipartite entangled quantum states. This study demonstrates the generation of N-photon N-mode Greenberger-Horne-Zeilinger (GHZ) states using symmetric multiport beam splitters. Two schemes are presented for generating GHZ states with arbitrary photon numbers using symmetric multiport beam splitters.
Proceedings Paper
Optics
F. Honz, F. Prawits, O. Alia, H. Sakr, T. Bradley, C. Zhang, R. Slavik, F. Poletti, G. Kanellos, R. Nejabati, P. Walther, D. Simeonidou, H. Hubel, B. Schrenk
Summary: In this study, coherent one-way quantum key distribution (QKD) at 1538 nm was successfully integrated into a 7.7 km long hollow-core fiber link with 17 EDFA-boosted C-band data channels. Despite the wideband layout of the classical channels, QKD operation proved successful.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)
Proceedings Paper
Optics
Florian Honz, Fabian Laudenbach, Hannes Hueber, Philip Walther, Bernhard Schrenk
Summary: An experimental comparison was conducted between a loss-optimized coherent heterodyne and a bandwidth-blessed intradyne CV-QKD architecture. The results show significant performance differences for different transmission distances.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)
Article
Quantum Science & Technology
Francesco Massa, Preeti Yadav, Amir Moqanaki, Walter O. Krawec, Paulo Mateus, Nikola Paunkovic, Andre Souto, Philip Walther
Summary: This research introduces a novel quantum key distribution scheme where users are fully classical, and quantum operations are performed by an untrusted third party acting as a server. The protocol achieves secure key exchange through interaction-free measurements on the shared state, and a full security proof is provided. The study deepens the understanding of quantum key distribution and provides new possibilities for quantum cryptography networks.
Article
Optics
Thomas B. Mieling, Christopher Hilweg, Philip Walther
Summary: Experiments at the interface of quantum field theory and general relativity, utilizing path-entangled quantum states of light to measure components of the Riemann curvature tensor, can enhance sensitivity to gravitational effects and reduce the required height difference to rule out flat space-time.
Article
Quantum Science & Technology
Raphael Nold, Charles Babin, Joel Schmidt, Tobias Linkewitz, Maria T. Perez Zaballos, Rainer Stoehr, Roman Kolesov, Vadim Vorobyov, Daniil M. Lukin, Rudiger Boppert, Stefanie Barz, Jelena Vuekovic, J. Christof M. Gebhardt, Florian Kaiser, Jorg Wrachtrup
Summary: High-precision optical measurements are crucial in science and engineering. This paper presents a simple method that infers optical phase shifts through standard intensity measurements while still maintaining the quantum advantage in measurement precision. The study demonstrates the potential for achieving quantum advantage and improving performance in practical applications.
