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quant-ph2020

Nuclear clocks for testing fundamental physics

E. Peik, T. Schumm, M. S. Safronova +3

The low-energy, long-lived isomer in Th, first studied in the 1970s as an exotic feature in nuclear physics, continues to inspire a multidisciplinary community of physicist…

quant-ph2020★ 7 cited

Three qubits in less than three baths: Beyond two-body system-bath interactions in quantum refrigerators

Ahana Ghoshal, Sreetama Das, Amit Kumar Pal +2

We show that quantum absorption refrigerators, which have traditionally been studied as of three qubits, each of which is connected to a thermal reservoir, can also be constructed…

quant-ph2020★ 45 cited

lattice gauge theories and Kitaev's toric code: A scheme for analog quantum simulation

Lukas Homeier, Christian Schweizer, Monika Aidelsburger +2

Kitaev's toric code is an exactly solvable model with -topological order, which has potential applications in quantum computation and error correction. However, a dir…

quant-ph2020★ 10 cited

A Moment for Random Measurements

Lukas Knips

Quantum entanglement is one of the core features of quantum theory. While it is typically revealed by measurements along carefully chosen directions, here we review different metho…

quant-ph2020★ 11 cited

Impurity dephasing in a Bose-Hubbard model

Fabio Caleffi, Massimo Capone, Inés de Vega +1

We study the dynamics of a two-level impurity embedded in a two-dimensional Bose-Hubbard model at zero temperature from an open quantum system perspective. Results for the decohere…

quant-ph2020★ 1 cited

Comparison of the mean field and Bohmian semi-classical approximations to the Rabi model

Dirk-André Deckert, Leopold Kellers, Travis Norsen +1

Bohmian mechanics is an alternative to standard quantum mechanics that does not suffer from the measurement problem. While it agrees with standard quantum mechanics concerning its…

quant-ph2020

Wavefunctions and Minkowski Space-Time: On the Reconciliation of Quantum Theory with Special Relativity

Christian Beck

The implications of the relativistic space-time structure for a physical description by quantum mechanical wave-functions are investigated. On the basis of a detailed analysis of B…

quant-ph2020

Dynamical field inference and supersymmetry

Margret Westerkamp, Igor Ovchinnikov, Philipp Frank +1

Knowledge on evolving physical fields is of paramount importance in science, technology, and economics. Dynamical field inference (DFI) addresses the problem of reconstructing a st…

quant-ph2020★ 1 cited

Gaussian state entanglement witnessing through lossy compression

Waldemar Klobus, Pawel Cieslinski, Lukas Knips +2

We propose a method to witness entanglement between two continuous-variable systems in a Gaussian state. Its key ingredient is a local lossy state transfer from the original spatia…

quant-ph2020

Optimal Strategies for Optical Quantum Memories Using Long-Lived Noble-Gas Spins

Or Katz, Eran Reches, Roy Shaham +3

Nuclear spins of noble gases exhibit exceptionally long coherence times and can potentially serve as a long-lived storage medium for quantum information. We analyze and compare the…

quant-ph2020★ 341 cited

Layerwise learning for quantum neural networks

Andrea Skolik, Jarrod R. McClean, Masoud Mohseni +2

With the increased focus on quantum circuit learning for near-term applications on quantum devices, in conjunction with unique challenges presented by cost function landscapes of p…

quant-ph2020★ 63 cited

Coherent and Purcell-enhanced emission from erbium dopants in a cryogenic high-Q resonator

Benjamin Merkel, Alexander Ulanowski, Andreas Reiserer

The stability and outstanding coherence of dopants and other atom-like defects in tailored host crystals make them a leading platform for the implementation of distributed quantum…

quant-ph2020★ 12 cited

Certified Randomness from Remote State Preparation Dimension Witness

Xing Chen, Kai Redeker, Robert Garthoff +3

Randomness in Bell test data can be device-independently certified by Bell's theorem without placing assumptions about the experimental devices. The device-independent randomness h…

quant-ph2020★ 38 cited

Fermionic systems for quantum information people

Szilárd Szalay, Zoltán Zimborás, Mihály Máté +3

The operator algebra of fermionic modes is isomorphic to that of qubits, the difference between them is twofold: the embedding of subalgebras corresponding to mode subsets and mult…

quant-ph2020★ 78 cited

Concept of orbital entanglement and correlation in quantum chemistry

Lexin Ding, Sam Mardazad, Sreetama Das +4

A recent development in quantum chemistry has established the quantum mutual information between orbitals as a major descriptor of electronic structure. This has already facilitate…

quant-ph2020★ 16 cited

Resource theory of quantum coherence with probabilistically non-distinguishable pointers and corresponding wave-particle duality

Chirag Srivastava, Sreetama Das, Ujjwal Sen

One of the fundamental features of quantum mechanics is the superposition principle, a manifestation of which is embodied in quantum coherence. Coherence of a quantum state is inva…

quant-ph2020★ 38 cited

Dynamical decoupling of spin ensembles with strong anisotropic interactions

Benjamin Merkel, Pablo Cova Fariña, Andreas Reiserer

Ensembles of dopants have widespread applications in quantum technology. The miniaturization of corresponding devices is however hampered by dipolar interactions that reduce the co…

quant-ph2020★ 4 cited

Prethermalization of quantum systems interacting with non-equilibrium environments

Andreu Anglés-Castillo, Mari Carmen Bañuls, Armando Pérez +1

The usual paradigm of open quantum systems falls short when the environment is actually coupled to additional fields or components that drive it out of equilibrium. Here we explore…

quant-ph2020★ 1 cited

The Holy Grail of Quantum Artificial Intelligence: Major Challenges in Accelerating the Machine Learning Pipeline

Thomas Gabor, Leo Sünkel, Fabian Ritz +5

We discuss the synergetic connection between quantum computing and artificial intelligence. After surveying current approaches to quantum artificial intelligence and relating them…

quant-ph2020

Approximate Approximation on a Quantum Annealer

Irmi Sax, Sebastian Feld, Sebastian Zielinski +3

Many problems of industrial interest are NP-complete, and quickly exhaust resources of computational devices with increasing input sizes. Quantum annealers (QA) are physical device…

quant-ph2020★ 8 cited

Optimizing Geometry Compression using Quantum Annealing

Sebastian Feld, Markus Friedrich, Claudia Linnhoff-Popien

The compression of geometry data is an important aspect of bandwidth-efficient data transfer for distributed 3d computer vision applications. We propose a quantum-enabled lossy 3d…

quant-ph2020

Cooperation and dependencies in multipartite systems

Waldemar Klobus, Marek Miller, Mahasweta Pandit +7

We propose an information-theoretic quantifier for the advantage gained from cooperation that captures the degree of dependency between subsystems of a global system. The quantifie…

quant-ph2020

Cross Entropy Hyperparameter Optimization for Constrained Problem Hamiltonians Applied to QAOA

Christoph Roch, Alexander Impertro, Thomy Phan +3

Hybrid quantum-classical algorithms such as the Quantum Approximate Optimization Algorithm (QAOA) are considered as one of the most encouraging approaches for taking advantage of n…

quant-ph2020★ 36 cited

Reduced Density Matrix Functional Theory for Bosons

Carlos L. Benavides-Riveros, Jakob Wolff, Miguel A. L. Marques +1

Based on a generalization of Hohenberg-Kohn's theorem, we propose a ground state theory for bosonic quantum systems. Since it involves the one-particle reduced density matrix a…