Article
Optics
Adam Burgess, Marian Florescu
Summary: This study explores the dynamics of coupled atomic two-level systems within a generic bosonic reservoir. In the regime where many atoms are identically coupled to a single reservoir, interesting effects are identified, such as the strong impact of the initial configuration of atomic excited-state amplitudes on the system dynamics, which can even sever the system from its environment. Additionally, it is found that steady-state amplitudes of the excited states become independent of the specific structure of the bosonic reservoirs considered.
Article
Optics
G. J. Delben, M. W. Beims, M. G. E. da Luz
Summary: This paper discusses the difficulties and methods to overcome them in quantum control of a two-level system under the influence of both Markovian and non-Markovian noise. The results show that for Markovian noise, the breakdown time decreases with the decay rate ⠂ not as an exponential but as a power law, indicating that stronger coupling between the system and the environment allows for quantum control. Moreover, for non-Markovian noise, the breakdown time is longer when there is backflow, i.e., ⠂(t) can be negative. These results reveal favorable scenarios for operating qubits in a noisy medium.
Article
Optics
G. J. Delben, M. W. Beims, G. E. da Luz
Summary: This paper discusses the quantum control problem of a two-level system under the influence of both Markovian and non-Markovian noise, and proposes solutions such as employing a fast control scheme or controlling the off-diagonal terms of the system density matrix. The experimental results reveal that the breakdown time of quantum control is related to the coupling strength under Markovian noise, and is longer when there is backflow under non-Markovian noise.
Article
Physics, Fluids & Plasmas
Xiyan Yang, Yiren Chen, Tianshou Zhou, Jiajun Zhang
Summary: Biological processes are controlled by biochemical reaction networks operating far from thermodynamic equilibrium, dissipated free energy. Single reaction events occur in a memory manner, leading to non-Markovian kinetics. By calculating the energy consumption of a general reaction system with molecular memory, it is revealed that energy dissipation is influenced by broken detailed balance and direction-time dependence of waiting-time distributions.
Article
Physics, Multidisciplinary
Jing Nie, Yingshuang Liang, Biao Wang, Xiuyi Yang
Summary: The study investigates the open-system dynamics of a spin-qubit in competing Markovian and non-Markovian environments, finding that the energy mismatch plays a significant role in dynamics transitions. By controlling the number of outer spins and coupling strength, transitions from Markovian to non-Markovian with speedup can be achieved. The increase in the number of decoherence channels enhances non-Markovianity and speeds up the evolution of the spin-qubit.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Optics
Shaoying Yin, Shutian Liu, Jie Song, Hongliang Luan
Summary: The Markovian and non-Markovian dynamics of quantum coherence are investigated in the XX spin chain with three-spin interaction. It is found that the single-spin and localized coherence increase with time. The three-spin interaction can lower the values of quantum coherence in Markovian evolution and heighten the oscillation frequency of quantum coherence in non-Markovian evolution.
Article
Physics, Multidisciplinary
Daniel C. Cole, Stephen D. Erickson, Giorgio Zarantonello, Karl P. Horn, Pan-Yu Hou, Jenny J. Wu, Daniel H. Slichter, Florentin Reiter, Christiane P. Koch, Dietrich Leibfried
Summary: We demonstrate a simplified method for dissipative generation of an entangled state of two trapped-ion qubits, achieving a fidelity of 0.949 in approximately 7 ms. The dominant source of infidelity is photon scattering, and strategies for its mitigation are discussed.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Yan Wang, Ze-Yan Hao, Jia-Kun Li, Zheng-Hao Liu, Kai Sun, Jin-Shi Xu, Chuan-Feng Li, Guang-Can Guo
Summary: This study experimentally observed the non-Markovian evolution of EPR steering and confirmed the key role of memory effect in its sudden death and revival processes. The unsteerable feature was strictly verified during the non-Markovian evolution. This Letter provides insightful understanding of the applications of EPR steering in quantum open systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Christina Giarmatzi, Fabio Costa
Summary: The method proposes a way to detect quantum memory in a non-Markovian process by formalizing the distinction between classical and quantum memory using the process matrix formalism. The detection of quantum memory serves as a versatile experimental tool for open quantum systems, similar to entanglement witnesses.
Article
Optics
S. L. Wu, W. Ma
Summary: We propose a systematic scheme to engineer quantum states of a non-Markovian quantum system. By reverse engineering, we determine the control parameters to achieve quantum state transfer. Experimental results confirm the effectiveness of this scheme.
Review
Multidisciplinary Sciences
Artur Czerwinski
Summary: This paper provides an overview of the fundamental concepts of open quantum systems, covering key topics such as dynamical semigroups and measures of non-Markovianity.
Article
Physics, Multidisciplinary
Kang Lan, Shijie Xie, Xiangji Cai
Summary: We theoretically study the geometric quantum speed limits (QSLs) of open quantum systems under Markovian dynamical evolution. We introduce three types of QSL time bounds based on the geometric inequality associated with the dynamical evolution from an initial state to a final state. By illustrating these bounds in different scenarios, we reveal the significant role of the system Hamiltonian in driving the Markovian evolution and its impact on the unsaturation of QSL bounds.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Vasily E. Tarasov
Summary: A general approach using general fractional calculus is proposed for constructing non-Markovian quantum theory, suggesting non-Markovian equations for quantum observables and states with a form of non-locality in time. A wide class of exactly solvable models for non-Markovian quantum dynamics is introduced, discussing properties like bi-positivity, complete positivity, dissipativity, and generalized dissipativity. Examples of a quantum oscillator and two-level quantum system with a general form of nonlocality in time are provided in this approach.
Article
Physics, Multidisciplinary
Suraka Bhattacharjee, Koushik Mandal, Supurna Sinha
Summary: We derive a non-Markovian master equation to study decoherence in a magnetic field coupled to a bath. We analyze the decay of off-diagonal elements of the reduced density matrix and find that the coherent oscillations are suppressed due to coupling with the environment. We compare three different cutoff models for the spectral density of an Ohmic bath and observe convergence at higher frequencies.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Optics
Lea Lautenbacher, Fernando de Melo, Nadja K. Bernardes
Summary: This study investigates the problem of reversing quantum dynamics using optimal Petz recovery maps. Specifically, it focuses on decoherence channels like dephasing, depolarizing, and amplitude damping. The study demonstrates how a physically implementable recovery map effectively simulates inverse evolution. Furthermore, it explores the approximation of recovery maps as inverse maps in the context of non-Markovian dynamics and shows how this strategy attenuates non-Markovian effects.
Article
Physics, Multidisciplinary
Christian J. Eckhardt, Giacomo Passetti, Moustafa Othman, Christoph Karrasch, Fabio Cavaliere, Michael A. Sentef, Dante M. Kennes
Summary: Recent experimental advances have allowed the manipulation of quantum matter using the quantum nature of light. However, there is a lack of exactly solvable models in the solid-state quantum materials context. In this study, a solvable model coupling a tight-binding chain to a single cavity mode is presented, and important properties of the system are revealed.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Yandong Li, Chongxiao Fan, Xiaoyong Hu, Yutian Ao, Cuicui Lu, C. T. Chan, Dante M. Kennes, Qihuang Gong
Summary: This Letter investigates photonic topological insulators with different types of gain-loss domain walls and proposes a method for constructing effective Hamiltonians. Additionally, it studies domain-induced higher-order topological states in two-dimensional non-Hermitian lattices and successfully explains these phenomena. The results reveal the physics in manipulating non-Hermitian topological states using gain-loss domain walls in photonic topological insulators.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Konstantin G. Wirth, Jonas B. Hauck, Alexander Rothstein, Hristiyana Kyoseva, Dario Siebenkotten, Lukas Conrads, Lennart Klebl, Ammon Fischer, Bernd Beschoten, Christoph Stampfer, Dante M. Kennes, Lutz Waldecker, Thomas Taubner
Summary: In this study, ABCB stacked tetralayer graphene domains were identified and characterized using scattering-type scanning near-field optical microscopy and confocal Raman microscopy. By comparing experimental results with theoretical predictions, a reliable method for the recognition of ABCB domains in tetralayer graphene was established.
Article
Physics, Multidisciplinary
Denitsa R. Baykusheva, Mona H. Kalthoff, Damian Hofmann, Martin Claassen, Dante M. Kennes, Michael A. Sentef, Matteo Mitrano
Summary: The applicability of using entanglement witnesses and operator-specific quantum bounds to diagnose many-body entanglement in condensed matter systems is investigated. The study focuses on detecting entangled states in quantum systems driven out of equilibrium. The dynamics of a fermion chain undergoing a time-dependent change of the Coulomb interaction is studied using the multipartite entanglement witness, the quantum Fisher information. The results show that the quantum Fisher information can witness distinct signatures of multipartite entanglement both near and far from equilibrium, and these signatures are robust against decoherence. The findings have implications for probing entanglement in light-driven quantum materials with time-resolved optical and x-ray scattering methods.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Dorri Halbertal, Lennart Klebl, Valerie Hsieh, Jacob Cook, Stephen Carr, Guang Bian, Cory R. Dean, Dante M. Kennes, D. N. Basov
Summary: When two-dimensional van der Waals materials are stacked to build heterostructures, moire' patterns emerge, leading to relaxation of atomic positions and impact on physical properties. This study provides experimental evidence for the three-dimensional relaxation in multilayered heterostructures and develops a continuum approach to model the relaxation processes. The approach is applicable to various layered systems and can uncover the impact of interfacial defects.
Article
Chemistry, Multidisciplinary
Jin Zhang, Nicolas Tancogne-Dejean, Lede Xian, Emil Vinas Bostrom, Martin Claassen, Dante M. Kennes, Angel Rubio
Summary: Laser-induced ultrafast demagnetization is an interesting phenomenon with significant implications in ultrafast optoelectronics and spintronics. The spin response is found to depend on the laser wavelength and polarization due to electron correlations, band renormalizations, and charge redistributions.
Article
Physics, Multidisciplinary
Giacomo Passetti, Christian J. Eckhardt, Michael A. Sentef, Dante M. Kennes
Summary: In this study, the hybridization between light and matter is investigated for cavity control over quantum materials. It is found that specific quantum fluctuations of the matter system play a crucial role in achieving entanglement between light and matter, and in turn, light-matter entanglement is essential for modifying electronic properties by the cavity. The hypothesis is proposed that quantum fluctuations of matter operators coupled to cavity modes are a general requirement for light-matter entanglement in the ground state.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Lennart Klebl, Ammon Fischer, Laura Classen, Michael M. Scherer, Dante M. Kennes
Summary: Evidence of correlated insulating and superconducting phases in tWSe2 was reported. A functional renormalization group approach was used to investigate their origin and interplay. The phase diagram as a function of filling and perpendicular electric field was mapped, revealing mixed-parity superconducting order parameters with s/f-wave and topological d/p-wave symmetry.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Clara S. Weber, Mikhail Pletyukhov, Zhe Hou, Dante M. Kennes, Jelena Klinovaja, Daniel Loss, Herbert Schoeller
Summary: We uncover the fundamental connection between supersymmetry (SUSY) and a wide class of two-dimensional (2D) second-order topological insulators (SOTI). This connection arises from applying a half-integer Aharonov-Bohm flux through a hole in the system. The presence of chiral symmetry, inversion symmetry, and mirror symmetry is crucial in establishing this link. We show that at a half-integer flux, the mirror symmetry and inversion symmetry lead to a nontrivial SUSY representation for the Hamiltonian in each chiral sector. This results in the presence of zero-energy states and exact twofold degeneracy of eigenstates with nonzero energy even in finite-sized systems.
Article
Materials Science, Multidisciplinary
Francesco Grandi, Armando Consiglio, Michael A. Sentef, Ronny Thomale, Dante M. Kennes
Summary: Kagome metals AV3Sb5 (A = K, Rb, Cs) exhibit an exotic charge order with broken symmetries and orbital currents. It is still debated whether the origin of the charge order is due to electron-electron or electron-phonon interactions. We systematically characterize different charge order configurations and propose using resonant ultrasound spectroscopy to experimentally characterize the order parameters.
Article
Materials Science, Multidisciplinary
Jacob Beyer, Jonas B. Hauck, Lennart Klebl, Tilman Schwemmer, Dante M. Kennes, Ronny Thomale, Carsten Honerkamp, Stephan Rachel
Summary: We study the Rashba-Hubbard model on the square lattice, which is a typical case for studying spin-orbit coupling effects in correlated electron systems. Using a truncatedunity variant of the functional renormalization group, we analyze magnetic and superconducting instabilities simultaneously. Phase diagrams are derived based on the strengths of Rasbha spin-orbit coupling, real second-neighbor hopping, and electron filling. Both commensurate and incommensurate magnetic phases are found to compete with d-wave superconductivity. Mixing of d-wave singlet pairing with f-wave triplet pairing is quantified due to the breaking of inversion symmetry.
Article
Physics, Multidisciplinary
Yuchi He, Kang Yang, Jonas B. Hauck, Emil J. Bergholtz, Dante M. Kennes
Summary: We investigated unconventional superconductivity in repulsive spinless fermions on square and honeycomb lattices with staggered sublattice potentials. The two lattices exhibit staggered d-wave and f-wave pairings, respectively, at low doping due to a two-valley band structure. At higher doping, the square lattice shows a richer phase diagram, including topological p + ip superconductivity induced by a different mechanism compared to the d-wave pairing. We analyzed this phenomenon analytically and numerically, and provided phase diagrams for finite doping.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Tanay Nag, Dante M. Kennes
Summary: This study focuses on the influence of anisotropy and nonlinearity in multi-Weyl semimetal lattice Hamiltonians on diffusive transport quantities. Clear signatures of specific topological features are identified, providing a potential means to differentiate between different phases of Weyl semimetals.
Article
Materials Science, Multidisciplinary
T. Okugawa, A. Benyamini, A. J. Millis, D. M. Kennes
Summary: Using the time-dependent Ginzburg-Landau equations, the study investigates vortex motion driven by an applied current in two-dimensional superconductors with a physical boundary. The results show that the vortex lattice exhibits different motion patterns, including collective movement, channeling, and stick-slip motion, depending on the magnitude of the sourced current.
Article
Materials Science, Multidisciplinary
T. Okugawa, S. Park, P. Recher, D. M. Kennes
Summary: This study proposes a superconducting structure that enables the nucleation and control of vortices on-demand by controlling magnetic fields and currents. By introducing normal conducting rails to guide the nucleation process and motion of vortices, the researchers addressed the randomness of nucleation and studied the effects of rail-vortex and vortex-vortex interactions on resistance quantization.
