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Quantum‐Enhanced Sensing Based on Time Reversal of Entangling Interactions

Quantum‐Enhanced Sensing Based on Time Reversal of Entangling Interactions
Author: Daniel Linnemann
Publisher: Springer
Total Pages: 171
Release: 2018-07-28
Genre: Science
ISBN: 3319960083
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Quantum mechanics entails effects like superpositions and entanglement, which have no classical counterparts. From a technological standpoint these counterintuitive quantum aspects can be viewed as an unexploited resource that can be harnessed to support various tasks, e.g. in the domains of computation, communication, and metrology. In many applications, however, the potential of nonclassical states cannot practically be exploited due to detection inefficiencies. The authors address this limitation by experimentally realizing a novel detection scheme in which entangling interactions are time reversed. In this way, nonclassical many-particle states are disentangled, allowing them to be detected in a robust and technically feasible manner. In the context of quantum metrology, these nonlinear readout techniques extend the class of entangled probe states that can be leveraged for sensing applications without being limited by finite detector resolution. The authors present an active atom interferometer, where both the entangled state preparation and disentangling readout involve parametric amplification. This “SU(1,1)” interferometer is implemented with the help of spinor Bose–Einstein condensates, where amplification is implemented by atomic collisions leading to spin exchange.

Quantum Enhanced Sensing and Communication

Quantum Enhanced Sensing and Communication
Author: Quntao Zhuang
Publisher:
Total Pages: 341
Release: 2018
Genre:
ISBN:
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Quantum phenomena such as entanglement and superposition enable performance beyond what classical physics can provide in tasks of computing, communication and sensing. Quantum sensing aims to enhance the measurement precision in parameter estimation or error probability in hypothesis testing. The first part of this thesis focuses on protocols for entanglement-enhanced sensing. However, various quantum sensing schemes' quantum advantage disappears in presence of decoherence from noise and loss. The quantum illumination protocol, on the other hand, has advantage over classical illumination even in presence of decoherence. This thesis provides the optimum receiver design for quantum illumination, and extends quantum illumination target detection to the realistic scenario with target fading and the Neyman-Pearson decision criterion. Quantum algorithms can solve difficult problems more efficiently than classical algorithms, which makes various classical encryption schemes vulnerable. To remedy this security issue, quantum key distribution enables sharing of secret keys with unconditional protocol security. However, the secret-key-rate of the state-of-art single-mode based quantum key distribution protocols are limited by a fundamental rate-loss trade-off. To enhance the secret-key-rate, this thesis proposes a multi-mode based quantum key distribution protocol. To prove its security, the noisy entanglement assisted classical capacity is developed to enable a security framework for two-way quantum key distribution protocols such as the one proposed here. An essential notion in the entanglement assisted capacity is additivity. This thesis constructs a channel with non-additive classical capacity assisted by limited entanglement assistance, even when the classical capacity of the channel is additive.

Ultracold Atoms for Foundational Tests of Quantum Mechanics

Ultracold Atoms for Foundational Tests of Quantum Mechanics
Author: Robert J. Lewis-Swan
Publisher: Springer
Total Pages: 161
Release: 2016-06-25
Genre: Science
ISBN: 3319410482
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This thesis presents a theoretical investigation into the creation and exploitation of quantum correlations and entanglement among ultracold atoms. Specifically, it focuses on these non-classical effects in two contexts: (i) tests of local realism with massive particles, e.g., violations of a Bell inequality and the EPR paradox, and (ii) realization of quantum technology by exploitation of entanglement, for example quantum-enhanced metrology. In particular, the work presented in this thesis emphasizes the possibility of demonstrating and characterizing entanglement in realistic experiments, beyond the simple “toy-models” often discussed in the literature. The importance and relevance of this thesis are reflected in a spate of recent publications regarding experimental demonstrations of the atomic Hong-Ou-Mandel effect, observation of EPR entanglement with massive particles and a demonstration of an atomic SU(1,1) interferometer. With a separate chapter on each of these systems, this thesis is at the forefront of current research in ultracold atomic physics.

Quantum Sensing and Imaging

Quantum Sensing and Imaging
Author: V T Harikumar
Publisher: Harikumar V T
Total Pages: 0
Release: 2024-03-29
Genre: Computers
ISBN:
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"Quantum Sensing and Imaging: A Beginner's Guide to Sensing and Imaging" is an illuminating exploration into the fascinating world of quantum technology and its applications in sensing and imaging. Authored by leading experts in the field, this book is designed to provide a comprehensive introduction to the principles, techniques, and advancements in quantum sensing and imaging for readers at all levels of expertise. The book begins by laying a solid foundation in quantum mechanics, offering clear explanations of fundamental concepts such as superposition, entanglement, and quantum states. Through accessible language and illustrative examples, readers are guided through the intriguing realm where classical physics meets quantum phenomena, setting the stage for understanding quantum sensing and imaging principles. As the narrative unfolds, readers are introduced to a diverse range of quantum sensing and imaging techniques, including but not limited to: Quantum-enhanced metrology: Explore how quantum principles can revolutionize measurement accuracy and precision, leading to advancements in fields like atomic clocks, gravitational wave detection, and magnetic field sensing. Quantum imaging: Delve into the world of quantum-enhanced imaging techniques such as quantum radar, quantum-enhanced microscopy, and quantum-enhanced sensing of biological systems. Understand how quantum coherence and entanglement can be harnessed to achieve imaging resolutions beyond classical limits. Quantum sensors: Discover cutting-edge quantum sensor technologies that leverage quantum properties for ultrasensitive detection of physical quantities such as electromagnetic fields, temperature, pressure, and more. Learn about the potential applications of these sensors in fields ranging from healthcare to environmental monitoring. Throughout the book, complex concepts are elucidated using intuitive analogies, diagrams, and practical examples, making it accessible to readers with varied backgrounds in physics, engineering, or related disciplines. Each chapter includes exercises and discussion questions to reinforce learning and encourage critical thinking. "Quantum Sensing and Imaging" not only serves as an essential primer for those new to the field but also offers valuable insights and updates for seasoned researchers and practitioners. By demystifying quantum technologies and showcasing their real-world implications, this book inspires readers to envision and contribute to the future of quantum sensing and imaging applications.

KP effect

KP effect
Author:
Publisher: payman sheriff
Total Pages: 118
Release:
Genre:
ISBN: 3200039477
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Two clumps of matter pass through each other without sharing space; In some cases the colliding clumps of matter appear to deepen their distance even as they pass through each other. Clumps of a few hundred thousand lithium atoms that are cooled to within one-millionth of a degree above absolute zero a temperature so cold that the atoms march in lockstep and act as a single matter wave. The Interaction of light with matter has long been a field of interest for many quantum physicists, however, limited to the field of interaction plus the form of interaction. I've found it to be much better to look at not as a phenomenon but as something of a paradox, whether the audience find it tangible or not, this might probably be the best starting point if one wish to have million ways to see quantum theory in its entirety.

Quantum Computing

Quantum Computing
Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
Total Pages: 273
Release: 2019-04-27
Genre: Computers
ISBN: 030947969X
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Quantum mechanics, the subfield of physics that describes the behavior of very small (quantum) particles, provides the basis for a new paradigm of computing. First proposed in the 1980s as a way to improve computational modeling of quantum systems, the field of quantum computing has recently garnered significant attention due to progress in building small-scale devices. However, significant technical advances will be required before a large-scale, practical quantum computer can be achieved. Quantum Computing: Progress and Prospects provides an introduction to the field, including the unique characteristics and constraints of the technology, and assesses the feasibility and implications of creating a functional quantum computer capable of addressing real-world problems. This report considers hardware and software requirements, quantum algorithms, drivers of advances in quantum computing and quantum devices, benchmarks associated with relevant use cases, the time and resources required, and how to assess the probability of success.

Understanding Properties of Atoms, Molecules and Materials

Understanding Properties of Atoms, Molecules and Materials
Author: Pranab Sarkar
Publisher: CRC Press
Total Pages: 433
Release: 2022-02-17
Genre: Science
ISBN: 1000504433
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In a technology driven civilization the quest for new and smarter materials is everlasting. They are required as platforms for developing new technologies or for improving an already existing technology. The discovery of a new material is no longer chance driven or accidental, but is based on careful reasoning structured by deep understanding of the microconstituents of materials - the atoms and molecules in isolation or in an assembly. That requires fair amount of exposure to quantum and statistical mechanics. `Understanding Properties of Atoms, Molecules and Materials' is an effort (perhaps the first ever) to bring all the necessary theoretical ingredients and relevant physical information in a single volume. The book introduces the readers (first year graduates) or researchers in material chemistry/engineering to elementary quantum mechanics of atoms, molecules and solids and then goes on to make them acquainted with methods of statistical mechanics (classical as well as quantum) along with elementary principles of classical MD simulation. The basic concepts are introduced with clarity and illustrated with easy to grasp examples, thus preparing the readers for an exploration through the world of materials - the exotic and the mundane. The emphasis has been on the phenomena and what shapes them at the fundamental level. A comprehensive description of modern designing principles for materials with examples is a unique feature of the book. The highlights of the book are comprehensive introduction and analysis of Quantum states of atoms and molecules The translational symmetry and quantum states in periodic and amorphous solids Band structure and tuning Classical and quantum statistics with applications to ideal gases (photons, phonons and electrons, molecules) Quantum states in type-I and type-II superconductors (elementary theory included) Magnetic materials, materials with GMR and CMR Shape memory effects in alloys and materials 2D materials (graphene and graphene analogus) NLO and photovoltaic materials Hydrogen storage material for mitigating the looming energy crisis Quantum states in low and high band gap semiconductors Semimetals Designer materials, etc. The volume is designed and organized to create interest in the science of materials and the silent revolution that is redefining the goals and boundaries of materials science continuously.

Exploring the Quantum

Exploring the Quantum
Author: Serge Haroche
Publisher: OUP Oxford
Total Pages: 616
Release: 2006-08-11
Genre: Science
ISBN: 0191523240
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The counter-intuitive aspects of quantum physics have been long illustrated by thought experiments, from Einstein's photon box to Schrödinger's cat. These experiments have now become real, with single particles - electrons, atoms, or photons - directly unveiling the strange features of the quantum. State superpositions, entanglement and complementarity define a novel quantum logic which can be harnessed for information processing, raising great hopes for applications. This book describes a class of such thought experiments made real. Juggling with atoms and photons confined in cavities, ions or cold atoms in traps, is here an incentive to shed a new light on the basic concepts of quantum physics. Measurement processes and decoherence at the quantum-classical boundary are highlighted. This volume, which combines theory and experiments, will be of interest to students in quantum physics, teachers seeking illustrations for their lectures and new problem sets, researchers in quantum optics and quantum information.