Article
Quantum Science & Technology
WenWen Hu, Ri-Gui Zhou, Xin Li, Ping Fan, CanYun Tan
Summary: This paper presents a novel dynamic quantum secret sharing protocol that allows multi-particle entangled GHZ state sharing in high-dimensional quantum systems, with higher resource capacity and security provided through the use of a small number of entangled states for eavesdropping check. The protocol is immune to various attacks and shows decreasing efficiency in noise environments with increasing channel noise parameters.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Markus Rambach, Mahdi Qaryan, Michael Kewming, Christopher Ferrie, Andrew G. White, Jacquiline Romero
Summary: Self-guided tomography is demonstrated to be a practical, efficient, and robust technique for measuring higher-dimensional quantum states with high fidelities. The technique shows excellent performance for both pure and mixed states, achieving record high fidelities. It also exhibits robustness against various sources of experimental noise.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Senrui Chen, Wenjun Yu, Pei Zeng, Steven T. Flammia
Summary: The study presents an efficient and noise-resilient protocol for learning properties of quantum states, which can effectively characterize and mitigate noise interference in the shadow estimation scheme, suitable for current experimental conditions, with good sampling efficiency and noise resilience.
Article
Physics, Multidisciplinary
Yu-Cheng Chen, Ming Gong, Peng Xue, Hai-Dong Yuan, Cheng-Jie Zhang
Summary: This study investigates the quantum deleting and cloning in a pseudo-unitary system, showing the possibility of deleting and cloning a class of two different and nonorthogonal states. It also discusses state discrimination, which is strongly related to the quantum no-cloning theorem. The simulations using pseudo-unitary operators in conventional quantum mechanics with post-selection show success probabilities of deleting and cloning less than unity, in line with the quantum no-deleting and no-cloning theorems.
FRONTIERS OF PHYSICS
(2021)
Article
Optics
Dong-Xu Chen, Yunlong Wang, Feiran Wang, Jun-Long Zhao, Chui-Ping Yang
Summary: High-dimensional quantum systems have advantages over low-dimensional ones, but unitary transformations on quantum states become technically infeasible as the dimensionality increases. Photonic orbital angular momentum (OAM) provides a natural carrier to encode information in high-dimensional spaces. This work proposes an efficient scheme to realize arbitrary unitary transformations on the path-OAM coupled quantum states by combining the path and OAM degrees of freedom of a single photon. It reduces the number of required interferometers while maintaining the symmetric structure, and can be used to manipulate the photonic OAM states.
LASER & PHOTONICS REVIEWS
(2023)
Article
Quantum Science & Technology
Dong-Xu Chen, Junliang Jia, Pei Zhang, Chui-Ping Yang
Summary: This study presents two optimized architectures for effectively realizing arbitrary unitary transformations using photonic path and polarization. These architectures have significant importance in reducing the number of interferometers and transforming elementary operations.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Fluids & Plasmas
D. Cius, L. Menon Jr, M. A. F. dos Santos, A. S. M. de Castro, Fabiano M. Andrade
Summary: In this paper, we demonstrate how to map the nonunitary time-evolution operator in a unitary one by considering a dynamical Hilbert space with a time-dependent metric operator. Three examples of Hamiltonian operators and their corresponding unitary dynamics obtained from the solutions of FTSE are also discussed.
Article
Computer Science, Interdisciplinary Applications
Aleksandra Kim, Christopher Mutel, Andreas Froemelt
Summary: Global sensitivity analysis is a valuable tool for filtering and interpreting large models, but there is a lack of research on high-dimensional models. This study evaluates different methods' computational performance and provides recommendations for analyzing high-dimensional models.
ENVIRONMENTAL MODELLING & SOFTWARE
(2022)
Article
Optics
Artur F. Izmaylov, Robert A. Lang, Tzu-Ching Yen
Summary: Optimization of unitary transformations in variational quantum algorithms benefits greatly from efficient evaluation of cost function gradients. We propose extensions of the parameter-shift rule to deal with gradients as linear combinations of expectation values for generators with general eigenspectra. These approaches are exact and do not require auxiliary qubits, relying instead on generator eigenspectrum analysis.
Article
Automation & Control Systems
Moein Abedini, Seyed-Alireza Ahmadi, Majid Sanaye-Pasand
Summary: This article introduces a novel real-time algorithm for measuring power system frequency, which improves accuracy of frequency estimation and enables tracking of frequency deviations. The proposed method can be easily implemented on industrial hardware, is robust against noise and harmonics, and has been evaluated through simulation studies and prototype testing.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Quantum Science & Technology
Hasan Iqbal, Walter O. Krawec
Summary: In this study, a high-dimensional variant of the extended B92 protocol is investigated and shown to be able to extract a key over high noise channels. The protocol only requires Alice to send three high-dimensional states and Bob to perform partial measurements, with an information-theoretic security analysis conducted. By comparing its key rate with a high-dimensional BB84 protocol, it is demonstrated to have a higher key rate over high noise channels.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Quantum Science & Technology
Keisuke Asahara, Daiju Funakawa, Motoki Seki, Yohei Tanaka
Summary: Recent developments in the index theory of discrete-time quantum walks have allowed for the application of the theory to non-unitary time evolutions, showing that unitarity is not necessary for certain calculations in this context.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Hanchen Liu, Tianci Zhou, Xiao Chen
Summary: This study examines the entanglement structure of two-dimensional states generated by shallow circuits, observing entanglement phase transitions and generalizing the findings to other qudit systems. In another model, entanglement transitions are observed by varying the density of two-qubit gates in each layer.
Article
Computer Science, Information Systems
Xiaoxi Gong, Yuanpeng Liu, Qiaoyun Wu, Jiayi Huang, Hua Zong, Jun Wang
Summary: The paper introduces a novel approach for accurate and robust ego-motion estimation and reconstruction in indoor environments, achieved through creating event-based difference images and inferring camera ego-motion using a deep convolutional neural network, as well as reducing mismatch in depth estimation stage with an event region search algorithm.
IEEE TRANSACTIONS ON MULTIMEDIA
(2021)
Article
Quantum Science & Technology
Robin Lorenz, Jonathan Barrett
Summary: The study examines whether the causal structure of a unitary transformation can be understood in terms of its compositional structure and introduces a new formalism of 'extended circuit diagrams' to address cases where causal constraints are not evident simultaneously. By deriving causally faithful extended circuit decompositions for a large class of unitaries, it is hypothesized that every finite-dimensional unitary transformation has a causally faithful extended circuit decomposition.
Article
Physics, Multidisciplinary
Gopikrishnan Muraleedharan, Akimasa Miyake, Ivan H. Deutsch
NEW JOURNAL OF PHYSICS
(2019)
Article
Physics, Multidisciplinary
Manuel H. Munoz-Arias, Pablo M. Poggi, Poul S. Jessen, Ivan H. Deutsch
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Nathan K. Lysne, Kevin W. Kuper, Pablo M. Poggi, Ivan H. Deutsch, Poul S. Jessen
PHYSICAL REVIEW LETTERS
(2020)
Article
Quantum Science & Technology
Manuel H. Munoz-Arias, Ivan H. Deutsch, Pablo M. Poggi
Summary: This paper reexamines well-known protocols in quantum metrology using collective spins and proposes a unified picture for optimal state preparation based on a semiclassical description in phase space. It shows how this framework allows for quantitative predictions of the timescales required to prepare various metrologically useful states, even for moderate system sizes. Furthermore, it establishes a geometric picture that relates optimal entangled probe preparation to the existence of separatrices connecting saddle points in phase space. The results are illustrated with examples of specific Hamiltonians and a generalization to include p-body collective interaction is proposed, along with a proof of a no-go theorem for the local optimality of these models for p > 2.
Article
Optics
Anupam Mitra, Sivaprasad Omanakuttan, Michael J. Martin, Grant W. Biedermann, Ivan H. Deutsch
Summary: This paper revisits the implementation of a two-qubit entangling gate called Mt lmer-St rensen gate using adiabatic Rydberg dressing for neutral atoms. The study shows that rapid adiabatic passage can be achieved through a two-photon transition without the need for an ultraviolet laser, by simply modulating the amplitude of one field with fixed laser frequencies. The results demonstrate that entangling gate fidelities comparable to the one-photon excitation can be achieved with the two-photon excitation. Furthermore, the paper explores how the adiabatic dressing protocol can be used to implement entangling gates beyond the regime of a perfect Rydberg blockade, allowing for fast high-fidelity gates for atoms separated beyond the blockade radius.
Article
Quantum Science & Technology
Karthik Chinni, Manuel H. Munoz-Arias, Ivan H. Deutsch, Pablo M. Poggi
Summary: We research the behavior of errors in quantum simulations of spin systems with long-range multibody interactions resulting from the Trotter-Suzuki decomposition of the time-evolution operator. We find that even small variations in the simulation step size can lead to sharp changes in the Floquet operator, resulting in a proliferation of errors in the quantum simulation. These structural instability regions occur typically at intermediate Trotter step sizes and in the weakly interacting regime. We characterize them in p-spin models and transverse-field Ising models and predict their occurrence based on unitary perturbation theory. We also show that the effective Hamiltonian associated with the Trotter decomposition of the unitary time-evolution operator, when the Trotter step size is chosen to be in the structural instability region, is very different from the target Hamiltonian, explaining the large errors in the simulation.
Article
Optics
Sivaprasad Omanakuttan, Anupam Mitra, Michael J. Martin, Ivan H. Deutsch
Summary: In this study, we investigate the implementation of unitary maps on the nuclear spin of Sr-87, a d = 10 dimensional Hilbert space, using quantum optimal control. The system is found to be controllable through a combination of nuclear spin resonance and a tensor ac Stark shift, solely modulating the phase of a radio-frequency magnetic field. Alkaline-earth-metal atoms like Sr-87 offer favorable characteristics for such control, allowing for high fidelity preparation of arbitrary Haar-random states and SU(10) maps.
Article
Optics
D. Hemmer, E. Montano, B. Q. Baragiola, L. M. Norris, E. Shojaee, I. H. Deutsch, P. S. Jessen
Summary: Squeezing of collective atomic spins has been shown to enhance the sensitivity of atomic clocks and magnetometers significantly below the standard quantum limit, with entanglement generated by either dispersive interaction or state-dependent collisions in a quantum gas. The experiments utilize multilevel atoms to mimic pseudospin-1/2 particles, achieving peak metrological squeezing through quantum backaction from a dispersive quantum non-demolition measurement.
Article
Physics, Multidisciplinary
Karthik Chinni, Pablo M. Poggi, Ivan H. Deutsch
Summary: The research found that estimates of certain quantities in the simulation of a quantum system are more robust to chaotic perturbations than others.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Fluids & Plasmas
Manuel H. Munoz-Arias, Pablo M. Poggi, Ivan H. Deutsch
Summary: This paper introduces a new type of kicked p-spin models, characterizing their classical nonlinear dynamics and quantum chaos features. It demonstrates that the classification constructed in the classical system also applies to the quantum system.
Article
Quantum Science & Technology
Ivan H. Deutsch
Article
Quantum Science & Technology
Pablo M. Poggi, Nathan K. Lysne, Kevin W. Kuper, Ivan H. Deutsch, Poul S. Jessen
Article
Optics
Manuel H. Munoz-Arias, Ivan H. Deutsch, Poul S. Jessen, Pablo M. Poggi
Article
Optics
Anupam Mitra, Michael J. Martin, Grant W. Biedermann, Alberto M. Marino, Pablo M. Poggi, Ivan H. Deutsch
Article
Optics
Xiaodong Qi, Yuan-Yu Jau, Ivan H. Deutsch