Article
Optics
V Rezvani, A. T. Rezakhani
Summary: Manipulating a quantum system requires understanding of its evolution, and a Markovian master equation for the process matrix of an open system interacting with a reservoir has been developed. Introducing a scheme and extending techniques can achieve optimal local coherent process control at target times, with utility demonstrated in various quantum coherent control scenarios with different objectives.
Article
Physics, Fluids & Plasmas
Camilo Moreno, Juan-Diego Urbina
Summary: The study investigates the interplay between quantum corrections to decay and decoherence effects, finding that the competing effects of interference and decoherence lead to a universal nonmonotonic form for the survival probability depending only on the coupling strength and macroscopic parameters of the cavity. This demonstrates the delicate balance between quantum coherence and decoherence in closed systems with chaotic classical dynamics, highlighting the importance of considering quantum interference in such systems.
Article
Quantum Science & Technology
Yingkai Ouyang
Summary: The study proposes a new method of combining stabilizer codes with constant-excitation codes through code concatenation, effectively addressing the issue of coherent errors in realistic quantum systems and increasing the fault-tolerant threshold against stochastic errors, with potential as a quantum memory.
NPJ QUANTUM INFORMATION
(2021)
Article
Physics, Applied
Bichen Zhang, Swarnadeep Majumder, Pak Hong Leung, Stephen Crain, Ye Wang, Chao Fang, Dripto M. Debroy, Jungsang Kim, Kenneth R. Brown
Summary: In this paper, a method for reducing coherent errors by using hidden inverses is demonstrated. The effectiveness of this method is numerically simulated and experimentally validated on a trapped-ion quantum computer.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Laird Egan, Dripto M. Debroy, Crystal Noel, Andrew Risinger, Daiwei Zhu, Debopriyo Biswas, Michael Newman, Muyuan Li, Kenneth R. Brown, Marko Cetina, Christopher Monroe
Summary: Quantum error correction encodes information into a larger quantum system to protect it, and fault-tolerant circuits are essential for controlling logical qubits and suppressing errors. Experimental demonstration of fault-tolerant circuits for a Bacon-Shor logical qubit with trapped ion qubits shows significant reductions in error rates in the presence of noise. This indicates the potential of fault-tolerant circuits to enable highly accurate logical primitives in current quantum systems, with the possibility of achieving a stabilized logical qubit through improved gate operations and measurements.
Article
Engineering, Multidisciplinary
A-B A. Mohamed, M. M. Elkhateeb, M. Hashem, A-S F. Obada
Summary: This paper analytically solves an intrinsic decoherence model of an A-type qutrit interacting with a coherent field through intensity-dependent coupling. The study examines the impact of the qutrit-cavity interaction, intrinsic decoherence, and initial coherent field intensity on various quantum phenomena, revealing significant changes in the quantum effects with the increase of physical parameters. The interaction between the three-level atom and the coherent cavity field results in strong mixture, negativity entanglement, and total correlation, with their growth, regularity, and stability dependent on decoherence and initial coherent cavity intensity.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Physics, Multidisciplinary
Pei-Shun Yan, Lan Zhou, Wei Zhong, Yu-Bo Sheng
Summary: In this paper, a measurement-based entanglement purification protocol (MBEPP) is proposed to extract high-quality entangled coherent states (ECSs) from low-quality copies. The protocol can correct errors caused by photon loss and only requires Bell state measurement, making it convenient to implement.
FRONTIERS OF PHYSICS
(2022)
Article
Optics
Xiao Dong, Yihua Hu, Shilong Xu
Summary: This study investigates the effects of the surface property of rough targets on optical detection, analyzing the decoherence and depolarization effects and conducting corresponding experiments for verification. The findings provide valuable references for the design of optical lidar systems, as well as for roughness inference and target type identification.
Article
Chemistry, Analytical
Chengkai Pang, Qiongqiong Zhang, Zhaohui Li, Guang Wu
Summary: The paper presents a few-photon level pulsed coherent lidar, which reduces the decoherence effect over long distances by using a phase plate to achieve 100 m focusing. By applying a signal classification and superposition method, the system successfully extracts echo signals submerged in noise. It is capable of operating at different distances on noncooperation targets, with a high measurement rate and low measurement uncertainty.
Article
Physics, Applied
Lorenzo Campos Venuti, Domenico D'Alessandro, Daniel A. Lidar
Summary: The text discusses the application of quantum computing in optimization, focusing on finding the optimal control schedule for quantum annealing (QA) and the quantum approximate optimization algorithm (QAOA). By rigorously analyzing the quantum optimal control problem within Pontryagin's maximum principle framework, the study extends previous findings to open systems and suggests that continuous schedules may be more suitable for practical quantum optimization in noisy experimental environments.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Multidisciplinary
Sayed Abdel-Khalek, Kamal Berrada, Mariam Algarni, Hichem Eleuch
Summary: Using the Born Markovian master equation, the study investigated the dynamics of EPR steering, Bell nonlocality, and quantum entanglement in entangled coherent states (ECSs) under decoherence. The research found that correlation measurements start at their maximum and decline over time, and that quantum steering and nonlocality exhibit similar behaviors in terms of photon number during dynamics.
Article
Quantum Science & Technology
Masashi Ban
Summary: In this study, the quantumness of a two-level system interacting with one of two environments in an indefinite way is investigated by analyzing the violation of temporal steering inequalities. The results show that the coherent superposition of the two environments can enhance the quantumness of the two-level system, and the effective parameter regions for enhancing quantumness are identified.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Multidisciplinary Sciences
Felix Tebbenjohanns, M. Luisa Mattana, Massimiliano Rossi, Martin Frimmer, Lukas Novotny
Summary: This study demonstrates quantum control of an optically levitated nanoparticle with a mass of one femtogram in a cryogenic environment, achieving cooling of the particle's motion to the quantum ground state through measurement-based feedback. Optically levitated nanoparticles show promise for matter-wave experiments with massive objects due to their high controllability, offering a route to investigate quantum mechanics at macroscopic scales.
Article
Multidisciplinary Sciences
Xuezhi Ma, Kaushik Kudtarkar, Yixin Chen, Preston Cunha, Yuan Ma, Kenji Watanabe, Takashi Taniguchi, Xiaofeng Qian, M. Cynthia Hipwell, Zi Jing Wong, Shoufeng Lan
Summary: This study introduces an efficient solution to manipulate dark excitons by reintroducing photonics bound states in the continuum (BICs), enabling giant enhancement and highly directional emission of dark excitons. The directional emission is coherent at room temperature, shown through polarization analyses and interference measurements.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Fataneh Zehtabzadeh, Mohammad Javad Faghihi, Hamid Reza Baghshahi
Summary: The paper focuses on the effects of thermal noise on quantum systems, particularly on the quantum states of light, establishing a connection between thermal states and coherent states. The study indicates that considering thermal noise can improve the nonclassicality of the system.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Public, Environmental & Occupational Health
Emanuele Borgonovo, Genyuan Li, John Barr, Elmar Plischke, Herschel Rabitz
Summary: This study explores various aspects of global sensitivity analysis when analysts have the option to use different plausible distributions for model inputs. The uniqueness of sensitivity measures is lost when exploring results under each distribution, and independence is sacrificed when aggregating distributions. Removing the unique distribution assumption impacts the mathematical properties of variance-based sensitivity analysis and affects result interpretation.
Article
Optics
S. Sempere-Llagostera, G. S. Thekkadath, R. B. Patel, W. S. Kolthammer, I. A. Walmsley
Summary: In this study, we use the photon-number resolving capabilities of commercial superconducting nanowire single-photon detectors to improve the quality of single photons generated through nonlinear processes. Our results demonstrate the feasibility of enhancing the quality of heralded single-photon sources using readily available technology.
Article
Physics, Multidisciplinary
G. S. Thekkadath, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley
Summary: The article presents a scheme for measuring the time-frequency structure of quantum light and demonstrates its effectiveness through experiments. The proposed method does not require phase stability, nonlinearities, or spectral shaping, making it a simple and practical way to measure the modal structure of quantum light.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mathematics, Interdisciplinary Applications
John Barr, Herschel Rabitz
Summary: This paper describes a method for global sensitivity analysis based on embedding the joint probability distribution of multiple outputs into RKHS and measuring the distance between embeddings using maximum mean discrepancy. This method has the advantage of easy computability for high-dimensional outputs and determining the influence of input parameters on different features.
SIAM-ASA JOURNAL ON UNCERTAINTY QUANTIFICATION
(2022)
Article
Biochemistry & Molecular Biology
Fernando Bergasa-Caceres, Herschel A. Rabitz
Summary: This paper proposes the application of the folding interdiction target region (FITR) strategy for therapeutic drug design against Ebola virus and influenza A. It predicts target regions on relevant structural proteins of both viruses and discusses the challenges in designing effective therapeutic drugs using the predicted peptide candidates.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Review
Automation & Control Systems
Xiaozhen Ge, Re-Bing Wu, Herschel Rabitz
Summary: This review explores the landscapes of hybrid quantum-classical optimization algorithms prevalent in rapidly developing quantum technologies. It discusses how the objective function is computed by a quantum system while the optimizer is classical. The review shows that the landscape's geometry undergoes morphological changes from trap-free to rugged landscapes, eventually leading to barren-plateau landscapes where the optimizer can hardly move. This unified view is crucial for understanding different systems and finding ways to avoid traps or plateaus.
ANNUAL REVIEWS IN CONTROL
(2022)
Article
Biochemistry & Molecular Biology
Fernando Bergasa-Caceres, Herschel A. Rabitz
Summary: This article investigates the initial contact formation events along the folding pathway of the DNA-binding domain of p53 and the intermolecular events leading to its conversion into a prion-like form upon incubation with peptide P8(250-257). The calculations employ the sequential collapse model (SCM) to identify the segments involved in the initial contacts formation. Experimental evidence shows that the incubation of p53 with peptide P8(250-257) leads to an amyloid conformational transition. The findings suggest that disrupted initial contacts and enhanced folding through less stable contacts may contribute to core p53 amyloid misfolding.
Article
Chemistry, Physical
Herschel Rabitz, Benjamin Russell, Tak-San Ho
Summary: This Perspective explores the surprising ease of achieving optimal control of nonlinear phenomena in quantum and classical complex systems. It proposes a unified explanation based on the concept of control landscapes, where the same set of three underlying assumptions apply. Despite the high dimensionality of control variables, relatively short searches are typically required.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Mechanics
Zachary Quine, Alexei Goun, Francois Laforge, Herschel Rabitz, Chung K. Law
Summary: We propose a simple optical method for generating chemical concentration maps of mixing fluids using a chemically sensitive dye. This method detects the dye through planar laser induced fluorescence. We demonstrate the application of this method by investigating the collision and mixing of two microdroplets composed of different fluids.
Article
Multidisciplinary Sciences
Klaudia Dradrach, Michal Zmyslony, Zixuan Deng, Arri Priimagi, John Biggins, Piotr Wasylczyk
Summary: Researchers demonstrate the use of light-driven pumping for small-scale manipulation of microlitre volumes of liquid using a liquid crystal elastomer strip. Optofluidics, which utilizes light for power and control, offers the potential for small, self-contained microfluidic devices that are more efficient and simpler to operate.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
S. E. Thomas, S. Sagona-Stophel, Z. Schofield, I. A. Walmsley, P. M. Ledingham
Summary: This paper reports a telecommunications wavelength- and bandwidth-compatible quantum memory, which enables efficient storage and on-demand retrieval of quantum optical states. It is an essential technology for future terrestrial-based quantum optical networking. The memory demonstrates a total internal efficiency of 20.90(1)% and a Doppler-limited storage time of 1.10(2) ns using the Off-Resonant Cascaded Absorption protocol in hot 87Rb vapor.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Industrial
John Barr, Herschel Rabitz
Summary: This paper presents a new kernel-based global sensitivity analysis (GSA) tool for single input-output data sets, with three key advances: (1) a new numerical estimator that shows empirical improvement over previous procedures; (2) a computational method for generating inner statistical functions from a single data set; (3) a theoretical extension defining conditional sensitivity indices for capturing shared information about the output when input-input correlations exist. Utilizing these indices, a decomposition of output uncertainty based on optimal learning sequence of input variables is derived, remaining consistent with input correlations. The new methodology is validated on benchmark systems, providing valuable insights.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2023)
Article
Multidisciplinary Sciences
F. H. B. Somhorst, R. van der Meer, M. Correa Anguita, R. Schadow, H. J. Snijders, M. de Goede, B. Kassenberg, P. Venderbosch, C. Taballione, J. P. Epping, H. H. van den Vlekkert, J. Timmerhuis, J. F. F. Bulmer, J. Lugani, I. A. Walmsley, P. W. H. Pinkse, J. Eisert, N. Walk, J. J. Renema
Summary: This study demonstrates that in a unitarily evolving system, single-mode measurements can converge to a thermal state using photons in an integrated optical interferometer. The resolution to the paradox between unitary evolution and the second law of thermodynamics is the recognition that the global unitary evolution of a multi-partite quantum state causes local subsystems to evolve towards maximum-entropy states. The experiment utilizes a programmable integrated quantum photonic processor to manipulate quantum states and shows the potential of photonic devices for simulating non-Gaussian states.
NATURE COMMUNICATIONS
(2023)
Proceedings Paper
Instruments & Instrumentation
Georg Enzian, Lars Freisem, John J. Price, Andreas O. Svela, Jack Clarke, Magdalena Szczykulska, Joshua Nunn, Ian Walmsley, Jonathan Silver, Leonardo Del Bino, Shuangyou Zhang, Pascal Del'Haye, Biveen Shajilal, Jiri Janousek, Ben C. Buchler, Ping Koy Lam, Michael R. Vanner
Summary: Research on backward Brillouin scattering in whispering-gallery-mode micro-resonators provides a promising avenue for both classical and quantum optomechanics applications. Our team, in collaboration with others, is utilizing this regime to prepare non-Gaussian motional states of the acoustic field. Recent experimental results include Brillouin optomechanical strong coupling, manipulation of thermal states by adding or subtracting single phonons, and phase-space tomography of non-Gaussian states generated by subtracting single or multiple phonons.
OPTICAL AND QUANTUM SENSING AND PRECISION METROLOGY II
(2022)
Article
Quantum Science & Technology
G. S. Thekkadath, S. Sempere-Llagostera, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley
Summary: This paper presents a GBS machine that achieves displacement by injecting a laser beam and a two-mode squeezed vacuum state. The study shows that the machine has the ability to reconstruct multimode Gaussian state and reduce computational complexity.
