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"Sanders, C."
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Experiencing Schumann : a listener's companion
During his lifetime and for at least a century after his death, Robert Schumann and his music were commonly misunderstood. His long struggle with mental illness was well known, and as a result some of the most original and innovative features of his work were often dismissed as bizarre and irrational. In recent years, however, the rhythmic complexities and unorthodox harmonic practices that lovers of his piano music and lieder have found so appealing are now being received with more objective treatment in critical and scholarly circles. His influence on the music of Brahms and other later composers now seems obvious. The refinement of Schumann's literary taste is evident not only in his songs, but also in the marvelous fantasy world of his piano pieces. Experiencing Schumann: A Listener's Companion combines a concise biography of Robert Schumann with an analysis of works from the most important genres in which he worked. The music is discussed in the frame of Schumann's eventful and ultimately tragic life, and the important influence of his brilliant and adoring--but strong-willed--wife, Clara Wieck Schumann, is also examined. A selected listening discography lists outstanding recorded performances of the featured compositions. Delving into Schumann's most famous pieces in engaging and accessible style, Donald Sanders provides insightful analysis for dedicated lovers of Schumann as well as newcomers to his musical innovations [Publisher description].
BOOK
Bounding quantum gate error rate based on reported average fidelity
Remarkable experimental advances in quantum computing are exemplified by recent announcements of impressive average gate fidelities exceeding 99.9% for single-qubit gates and 99% for two-qubit gates. Although these high numbers engender optimism that fault-tolerant quantum computing is within reach, the connection of average gate fidelity with fault-tolerance requirements is not direct. Here we use reported average gate fidelity to determine an upper bound on the quantum-gate error rate, which is the appropriate metric for assessing progress towards fault-tolerant quantum computation, and we demonstrate that this bound is asymptotically tight for general noise. Although this bound is unlikely to be saturated by experimental noise, we demonstrate using explicit examples that the bound indicates a realistic deviation between the true error rate and the reported average fidelity. We introduce the Pauli distance as a measure of this deviation, and we show that knowledge of the Pauli distance enables tighter estimates of the error rate of quantum gates.
Journal Article
Europe, small navies and maritime security : balancing traditional roles and emergent threats in the 21st century
This book seeks to identify and address gaps in our understanding of maritime security and the role of small navies in Europe. The majority of Europe's navies are small, yet they are often called upon to address a complex array of traditional and non-traditional threats. This volume examines the role of small navies within the European security architecture, by discussing areas of commonality and difference between navies, and arguing that it is not possible to fully understand either maritime strategy or European security without taking into account the actions of small navies. It contains a number of case studies that provide an opportunity to explore how different European states view the current security environment and how naval policy has undergone significant changes within the lifetime of the existing naval assets. In addition, the book examines how maritime security and naval development in Europe might evolve, given that economic forecasts will likely limit the potential procurement of larger' naval assets in the future, which means that European states will increasingly have to do more with less in the maritime domain. This book will be of much interest to students of maritime strategy, naval power, strategic studies, European politics andinternational relationsin general.
Book
Observation of topological edge states in parity–time-symmetric quantum walks
The study of non-Hermitian systems with parity–time (PT) symmetry is a rapidly developing frontier. Realized in recent experiments, PT-symmetric classical optical systems with balanced gain and loss hold great promise for future applications. Here we report the experimental realization of passive PT-symmetric quantum dynamics for single photons by temporally alternating photon losses in the quantum walk interferometers. The ability to impose PT symmetry allows us to realize and investigate Floquet topological phases driven by PT-symmetric quantum walks. We observe topological edge states between regions with different bulk topological properties and confirm the robustness of these edge states with respect to PT-symmetry-preserving perturbations and PT-symmetry-breaking static disorder. Our results contribute towards the realization of quantum mechanical PT-synthetic devices and suggest exciting possibilities for the exploration of the topological properties of non-Hermitian systems using discrete-time quantum walks.
Spontaneous parity–time-symmetry breaking and topological edge states are observed in a photonic non-Hermitian system — a quantum walk interferometer.
Journal Article
Affluence, austerity and electoral change in Britain
\"Investigates the political economy of party support for British political parties since Tony Blair led New Labour to power in 1997. Using valence politics models of electoral choice and marshalling an unprecedented wealth of survey data collected in the British Election Study's monthly Continuous Monitoring Surveys, the authors trace forces affecting support for New Labour during its 13 years in office\" --Provided by publisher.
Book
Randomized benchmarking for qudit Clifford gates
We introduce unitary-gate randomized benchmarking (URB) for qudit gates by extending single- and multi-qubit URB to single- and multi-qudit gates. Specifically, we develop a qudit URB procedure that exploits unitary 2-designs. Furthermore, we show that our URB procedure is not simply extracted from the multi-qubit case by equating qudit URB to URB of the symmetric multi-qubit subspace. Our qudit URB is elucidated by using pseudocode, which facilitates incorporating into benchmarking applications.
Journal Article
Photon-Mediated Interactions Between Distant Artificial Atoms
Photon-mediated interactions between atoms are of fundamental importance in quantum optics, quantum simulations, and quantum information processing. The exchange of real and virtual photons between atoms gives rise to nontrivial interactions, the strength of which decreases rapidly with distance in three dimensions. Here, we use two superconducting qubits in an open one-dimensional transmission line to study much stronger photon-mediated interactions. Making use of the possibility to tune these qubits by more than a quarter of their transition frequency, we observe both coherent exchange interactions at an effective separation of 3λ/4 and the creation of super-and subradiant states at a separation of one photon wavelength λ. In this system, collective atom-photon interactions and applications in quantum communication may be explored.
Journal Article
Observation of emergent momentum–time skyrmions in parity–time-symmetric non-unitary quench dynamics
Topology in quench dynamics gives rise to intriguing dynamic topological phenomena, which are intimately connected to the topology of static Hamiltonians yet challenging to probe experimentally. Here we theoretically characterize and experimentally detect momentum-time skyrmions in parity-time
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-symmetric non-unitary quench dynamics in single-photon discrete-time quantum walks. The emergent skyrmion structures are protected by dynamic Chern numbers defined for the emergent two-dimensional momentum-time submanifolds, and are revealed through our experimental scheme enabling the construction of time-dependent non-Hermitian density matrices via direct measurements in position space. Our work experimentally reveals the interplay of
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symmetry and quench dynamics in inducing emergent topological structures, and highlights the application of discrete-time quantum walks for the study of dynamic topological phenomena.
Dynamic topological phenomena remain challenging to be probed experimentally. Here, Wang et al. theoretically characterize and experimentally detect dynamical skyrmions in parity‐time‐symmetric non‐unitary quench dynamics in single‐photon discrete‐time quantum walks.
Journal Article
The critical importance of vouchers in genomics
A voucher is a permanently preserved specimen that is maintained in an accessible collection. In genomics, vouchers serve as the physical evidence for the taxonomic identification of genome assemblies. Unfortunately, the vast majority of vertebrate genomes stored in the GenBank database do not refer to voucher specimens. Here, we urge researchers generating new genome assemblies to deposit voucher specimens in accessible, permanent research collections, and to link these vouchers to publications, public databases, and repositories. We also encourage scientists to deposit voucher specimens in order to recognize the work of local field biologists and promote a diverse and inclusive knowledge base, and we recommend best practices for voucher deposition to prevent taxonomic errors and ensure reproducibility and legality in genetic studies.
Journal Article