Article
Computer Science, Artificial Intelligence
Elizabeth R. Bennewitz, Florian Hopfmueller, Bohdan Kulchytskyy, Juan Carrasquilla, Pooya Ronagh
Summary: Noisy intermediate-scale quantum devices can be used for quantum simulation tasks if the noise effects are reduced. A neural error mitigation approach using neural networks is introduced to improve estimates of ground states and observables obtained from quantum simulations on near-term devices. Experimental results show that neural error mitigation improves the accuracy and estimation of complex observables without requiring additional quantum resources.
NATURE MACHINE INTELLIGENCE
(2022)
Article
Physics, Multidisciplinary
Marcin Plodzien, Maciej Lewenstein, Emilia Witkowska, Jan Chwedenczuk
Summary: We demonstrate that one-axis twisting (OAT) is a powerful source of many-body Bell correlations for creating nonclassical states of bosonic qubits. We develop an analytical and universal treatment that allows us to identify the critical time for the emergence of Bell correlations and predict their depth at subsequent times. Our findings are illustrated using a highly nontrivial example of OAT dynamics generated with the Bose-Hubbard model.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Johannes Franke, Sean R. Muleady, Raphael Kaubruegger, Florian Kranzl, Rainer Blatt, Ana Maria Rey, Manoj K. Joshi, Christian F. Roos
Summary: This study demonstrates a pathway for harnessing large-scale entanglement in optical transitions, which can generate various features such as twisting, squeezing, and non-Gaussian states. By showing the metrological utility in a Ramsey-type interferometer, it reveals the potential of this method for quantum-enhanced sensing.
Article
Physics, Multidisciplinary
G. Enzian, J. J. Price, L. Freisem, J. Nunn, J. Janousek, B. C. Buchler, P. K. Lam, M. R. Vanner
Summary: Adding or subtracting a single quantum of excitation to a thermal state of a bosonic system has the counter-intuitive effect of approximately doubling its mean occupation. The experimental demonstration in this study showed the doubling of mechanical thermal fluctuations using single-phonon addition and subtraction. This joint click-dyne detection scheme opens up new possibilities for optomechanical quantum science and applications.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Tommaso Roscilde, Fabio Mezzacapo, Tommaso Comparin
Summary: The research proves two simple theorems about squeezing induced by bilinear spin-spin interactions that conserve spin parity, which applies to the vast majority of quantum spin models implemented by state-of-the-art quantum simulators. It shows that squeezing captures the first form of quantum correlations whether they are produced at equilibrium or away from equilibrium by manipulating the spin-spin interactions.
Article
Physics, Mathematical
Hajo Leschke, Alexander Sobolev, Wolfgang Spitzer
Summary: This study investigates the ideal Fermi gas in a plane perpendicular to an external magnetic field and defines the local entropy associated with a bounded region. The results show that the leading asymptotic growth of the local entropy as the scaling parameter tends to infinity follows a specific form. These findings provide insights into the behavior of the system under different conditions and can be extended to other quantum entropy measures.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2021)
Article
Quantum Science & Technology
Tatiana A. Bespalova, Oleksandr Kyriienko
Summary: The Hamiltonian operator approximation (HOA) is proposed as a method to approximate the Hamiltonian operator using a sum of propagators, benefiting analog quantum simulators. This approach is utilized in the hybrid quantum-classical workflow for energy measurements and shows promise in preparing ground states of complex material science models. The HOA method is found to outperform variational methods for systems with increasing size, especially for noisy large-scale quantum devices.
Article
Physics, Multidisciplinary
Francisco J. Gonzalez, Diego Tancara, Hossein T. Dinani, Raul Coto, Ariel Norambuena
Summary: In this work, we study the interaction between a defect composed of two spin-1/2 particles and phonon modes in a one-dimensional lattice using first-principles calculations. We derive the spectral density function and time-local master equation that describe the open dynamics of the defect starting from a dipolar magnetic interaction. We analyze the non-Markovian features induced by a pure dephasing channel acting on the Bell basis and investigate two measures of non-Markovianity based on canonical rates and Coherence, providing insights into the role of spectral density function and temperature.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
P. Chen, T. S. Yin, Z. Q. Jiang, G. R. Jin
Summary: A generalized collision model is developed to investigate coherent charging of a single quantum battery using repeated interactions with many-atom large spins. The results show that phase coherence of the atoms in the coherent protocol enables faster charging and increased power output. Additionally, the charging power of the battery, as defined by the ergotropy, closely follows the analytical results in the short-time limit.
Article
Materials Science, Multidisciplinary
Yong-Yi Wang, Zheng-Hang Sun, Heng Fan
Summary: Recent research has shown a disorder-free many-body localization (MBL), known as Stark MBL, in an interacting system with a linear potential. The study investigates Stark MBL in two types of superconducting circuits and calculates entanglement entropy and participate entropy of highly excited eigenstates. The findings suggest that superconducting circuits are a promising platform for studying the critical properties of the Stark MBL transition.
Article
Quantum Science & Technology
Ryuji Takagi, Bartosz Regula, Mark M. Wilde
Summary: This study establishes a quantitative relation between the one-shot distillable resource yield and dilution cost, providing bounds applicable to different types of quantum resources and transformations. The results have broad applications in various research fields.
Article
Materials Science, Multidisciplinary
Amrita Ghosh, Eytan Grosfeld
Summary: Through the use of QMC technique, it was discovered that hard-core bosons on the honeycomb lattice exhibit a dimer insulator phase near maximum anisotropy, characterized by a topological entanglement entropy ln(2)/2, indicative of a fractional quantum Hall state. The presence of edge states was identified, and a QMC-based method was derived to extract and verify their chirality, all without the need for magnetic flux or lattice frustration.
Article
Physics, Multidisciplinary
Minh C. Tran, Daniel K. Mark, Wen Wei Ho, Soonwon Choi
Summary: In conventional approaches, extracting arbitrary information from quantum states requires measurements in different bases, which may be challenging for current quantum devices. We propose a scalable protocol that utilizes the ergodic nature of quantum dynamics to efficiently extract physical properties without sophisticated controls. This protocol can be implemented in existing analog quantum simulation platforms.
Article
Quantum Science & Technology
Martin Ganahl, Jackson Beall, Markus Hauru, Adam G. M. Lewis, Tomasz Wojno, Jae Hyeon Yoo, Yijian Zou, Guifre Vidal
Summary: Google's TPUs are integrated circuits designed for accelerating and scaling up machine learning workloads. This study demonstrates how TPUs can be used to accelerate the density matrix renormalization group (DMRG) method for computing the ground state of a quantum many-body Hamiltonian. By utilizing half of a TPU v3 pod, a bond dimension of D = 216 = 65536 was achieved, allowing for faster optimization of MPS tensors.
Article
Optics
Stefanie Czischek, Giacomo Torlai, Sayonee Ray, Rajibul Islam, Roger G. Melko
Summary: This study explores novel physics in circuit models involving entangling unitary dynamics and disentangling measurements. Using tensor network simulations, it reveals a transition from volume-law to area-law in entanglement entropy, suggesting universal features of a measurement-induced phase transition. The research highlights the robustness of this transition against experimental noise and emphasizes the role of tensor network simulations in advancing critical phenomena.
Article
Physics, Multidisciplinary
T. Fogarty, C. Cormick, H. Landa, Vladimir M. Stojanovic, E. Demler, Giovanna Morigi
PHYSICAL REVIEW LETTERS
(2015)
Article
Materials Science, Multidisciplinary
Vladimir M. Stojanovic, Mihajlo Vanevic, Eugene Demler, Lin Tian
Article
Physics, Multidisciplinary
Vladimir M. Stojanovic
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Applied
Sascha H. Hauck, Vladimir M. Stojanovic
Summary: Theoretical studies of coherent atom transport have mainly focused on one-dimensional model systems, but this study investigates this phenomenon under more complex physical circumstances. The study proposes specific configurations of acousto-optic modulators to create a moving lattice effect and determine moving-lattice trajectories for single-atom transport. Two quantum-control methods, shortcuts to adiabaticity and enhanced STA, are utilized and compared for their transport efficiency. The study has direct implications for quantum technology applications involving neutral atoms.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Vladimir M. Stojanovie, Julian K. Nauth
Summary: This paper focuses on the engineering of the two-excitation Dicke state ID32) in a three-qubit system with all-to-all Ising-type qubit-qubit interaction and global transverse control fields. A pulse sequence is proposed, consisting of three instantaneous control pulses and two finite-duration Ising-interaction pulses, based on the concept of the symmetric sector. Numerical analysis is conducted to demonstrate the robustness of the proposed state-preparation scheme to systematic errors. The generalization of this scheme to systems with N > 4 qubits is also discussed.
Article
Materials Science, Multidisciplinary
Julian K. Nauth, Vladimir M. Stojanovic
Summary: We investigate the spectral properties of polaronic excitations within the framework of an analog quantum simulator based on superconducting transmon qubits and microwave resonators. By using the kernel-polynomial method, we evaluate the momentum-frequency resolved spectral function of this system and make predictions about the system dynamics following an excitation-phonon interaction quench. To make contact with anticipated experimental realizations, we utilize a previously proposed method for extracting dynamical-response functions in systems with local (single-qubit) addressability using the multiqubit (many-body) version of the Ramsey interference protocol.
Article
Optics
Vladimir M. Stojanovic, Julian K. Nauth
Summary: This article investigates the interconversions of W and Greenberger-Horne-Zeilinger states in qubit arrays with long-ranged Ising-type qubit-qubit interaction, and presents a detailed study of the state-interconversion problem in the three-qubit case, including the construction of the interconversion protocol and an analysis of its robustness to systematic errors.
Article
Optics
Julian K. Nauth, Vladimir M. Stojanovic
Summary: Using the quantum-brachistochrone formalism, this study addresses the problem of finding the fastest possible conversion between W and GHZ states in a system of three identical neutral atoms. By numerically solving equations, the time-dependent Rabi frequencies for external laser pulses corresponding to the time-optimal state conversion are determined.
Article
Physics, Multidisciplinary
Thorsten Haase, Gernot Alber, Vladimir M. Stojanovic
Summary: Motivated by the improved scalability of optically trapped neutral-atom systems, this study investigates the engineering of generalized (twisted) W states and GHZ states in a strongly interacting regime. The results demonstrate the realization of chiral W states and deterministic conversion from twisted W states to GHZ states, which is significant for noiseless-subsystem qubit encoding.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Sascha H. Hauck, Gernot Alber, Vladimir M. Stojanovic
Summary: The study investigates atomic transport under the conditions of a moving optical lattice and finds that the eSTA method outperforms the STA method in most cases.
Article
Optics
Thorsten Haase, Gernot Alber, Vladimir M. Stojanovi
Summary: In this study, we investigate the deterministic conversion between W and Greenberger-Horne-Zeilinger (GHZ) states in a neutral-atom system using dynamical symmetries and Lie-algebraic parametrization. Our approach, in contrast to previous methods, allows for easier experimental application and shorter completion time for the desired state conversion.
Article
Optics
Vladimir M. Stojanovic
Summary: This study demonstrates the creation of scalable entanglement resources in a different physical environment through the engineering of twisted W states in arrays of cold neutral atoms. By utilizing specific laser tuning and effective excitation-boson Hamiltonian, the desired W state can be prepared efficiently.
Article
Materials Science, Multidisciplinary
Vladimir M. Stojanovic
Article
Materials Science, Multidisciplinary
Vladimir M. Stojanovic, Igor Salom
Article
Optics
Vladimir M. Stojanovic
