Article
Optics
N. Gigena, M. Di Tullio, R. Rossignoli
Summary: We discuss a general bipartitelike representation and Schmidt decomposition of an arbitrary pure state of N indistinguishable fermions, focusing on the concept of M-body entanglement. We derive rigorous majorization relations satisfied by the normalized M-body density matrices, providing insights into the entanglement properties of fermionic states. These results offer a deeper understanding of entanglement in fermionic systems.
Article
Physics, Multidisciplinary
Yijian Zou, Karthik Siva, Tomohiro Soejima, Roger S. K. Mong, Michael P. Zaletel
Summary: This study introduces two related non-negative measures of tripartite entanglement and shows that states with nonzero measures have nontrivial entanglement. Additionally, it demonstrates that these entanglement measures in one dimension depend only on the emergent low-energy theory. For a gapped system, it argues that entanglement measures either both nonzero or both zero, depending on the system's ground state. Furthermore, a numerical algorithm is developed for computing entanglement measures in critical systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Ahana Chakraborty, Rajdeep Sensarma
Summary: This study introduces a new field theoretic method for calculating Renyi entropy of interacting bosons in subsystems without using replica methods. The method can be applied to dynamics of open and closed quantum systems, and can determine the relationship between the initial state and final density matrix to predict the behavior of entropy over time. The approach also shows that the entropy in non-Markovian dynamics approaches a steady-state value with exponents determined by nonanalyticities of the system's environment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Gregory A. Hamilton, Bryan K. Clark
Summary: We investigate the bulk geometry of the Wegner Wilson Flow (WWF) in the context of many-body localization, focusing on efficiency and bulk entanglement growth measures by approximating upper bounds on the boundary entanglement entropy. We establish a connection between these upper bounds and the Fubini-Study metric, and clarify how the information fluctuation complexity can differentiate bulk unitary rotation from entanglement production. Additionally, we provide a concise proof of the small incremental entangling theorem without the use of ancillas, achieving a dimension-independent, universal factor of c = 2.
Article
Physics, Condensed Matter
Alexandre M. Souza, Roberto S. Sarthour, Ivan S. Oliveira
Summary: Entanglement has been an area of great interest since the early years of quantum mechanics. In recognition of their efforts in verifying the properties of entangled photons, the Nobel Prize in Physics for 2022 was awarded to Alain Aspect, John F. Clauser, and Anton Zeilinger, who are leading pioneers in this field. However, entanglement is not limited to photons and can occur among hundreds, millions, or even more particles in condensed matter systems. Quantum entanglement leads to strong non-classical correlations among particles, playing a crucial role in various properties of matter such as superconductivity and different forms of magnetic order that arise from highly correlated ground states in many-body systems.
PHYSICA B-CONDENSED MATTER
(2023)
Review
Physics, Multidisciplinary
Irenee Frerot, Matteo Fadel, Maciej Lewenstein
Summary: This review discusses methods for detecting and characterizing quantum correlations in many-body systems, with a focus on scalable approaches. It introduces concepts such as quantum entanglement, Einstein-Podolsky-Rosen steering, and Bell nonlocality, both in the bipartite scenario and their generalizations to multipartite cases. The review also covers recent progress in characterizing quantum correlations, experimental techniques for preparing and measuring highly-entangled many-body systems, and the challenges associated with each platform. It concludes with a list of open problems in the field.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Optics
Jhen-Dong Lin, Yueh-Nan Chen
Summary: Many-body localization (MBL) can occur when strong disorders prevent an interacting system from thermalization. In this work, a modified algorithm is proposed by performing a measurement on the ancilla, enabling the determination of conditional dynamics by both ensemble average and quantum interference effect. This protocol leads to an enhancement of the dephasing effect and a boost in entanglement growth for systems in the deep MBL phase. Numerical simulations demonstrate a significant reduction in the saturation time, facilitating easier access to the behavior in the long-time regime.
Article
Multidisciplinary Sciences
Akhil Francis, Daiwei Zhu, Cinthia Huerta Alderete, Sonika Johri, Xiao Xiao, James K. Freericks, Christopher Monroe, Norbert M. Linke, Alexander F. Kemper
Summary: Partition functions play a crucial role in physics for determining thermodynamic properties and phase transitions of many-body systems. This study demonstrates a scalable approach for finding partition function zeros on quantum computers, showing a transition from XY-like behavior to Ising-like behavior with varying anisotropy. While quantum computers are not yet capable of reaching the thermodynamic limit, this work paves the way for future calculations of critical phenomena beyond classical computing limits.
Article
Physics, Multidisciplinary
Julian Leonard, Sooshin Kim, Matthew Rispoli, Alexander Lukin, Robert Schittko, Joyce Kwan, Eugene Demler, Dries Sels, Markus Greiner
Summary: Strongly correlated systems can exhibit unexpected phenomena when brought far from equilibrium, such as many-body localization preventing systems from reaching thermal equilibrium even at long times. The presence of small thermal inclusions can hinder the stability of the many-body localized phase, leading to the delocalization of the entire system through an avalanche propagation mechanism. This study explores the dynamics of a variable-sized thermal inclusion coupled to a many-body localized system and provides evidence for accelerated transport of the thermal inclusion into the localized region, as well as monitoring the spreading avalanche and thermalization process within the system.
Article
Optics
Sebastien Designolle
Summary: Quantum systems of high dimensions have interesting properties in observing entanglement or other forms of correlations, making them attractive for experiments in quantum communication or quantum cryptography due to their improved resistance to noise. However, verifying the high-dimensional nature remains challenging, especially when weak assumptions are made on the parties involved, such as considering one of them as a black box. Recently, the concept of genuine high-dimensional steering has been introduced, allowing for a one-sided device-independent certification of the dimension of a bipartite shared state using only two measurements. In this study, the author overcomes the limitations by developing universal bounds on the incompatibility robustness for more than two measurements, which can serve as meaningful dimension certificates.
Article
Materials Science, Multidisciplinary
Alessio Lerose, Michael Sonner, Dmitry A. Abanin
Summary: Describing the non-equilibrium properties of quantum many-body systems is difficult due to the high entanglement in the wave function. However, recent works have found that the influence matrix (IM) of an infinite system can be efficiently represented as a matrix-product state (MPS). This study investigates the origin of the efficiency of the IM approach and proposes an alternative algorithm to avoid temporal entanglement barriers (TEBs), providing an efficient construction of the thermodynamic-limit IM as a MPS.
Article
Materials Science, Multidisciplinary
Pietro Brighi, Alexios A. Michailidis, Dmitry A. Abanin, Maksym Serbyn
Summary: In this work, the stability of an Anderson insulator with a finite density of particles interacting with a single mobile impurity is investigated. The researchers provide perturbative arguments and use large-scale tensor network simulations to support the stability of localization in the strong interaction regime. They also develop a phenomenological description of the dynamics and demonstrate that the impurity effectively turns the Anderson insulator into a many-body localized (MBL) phase.
Article
Multidisciplinary Sciences
W. Morong, F. Liu, P. Becker, K. S. Collins, L. Feng, A. Kyprianidis, G. Pagano, T. You, A. V. Gorshkov, C. Monroe
Summary: Thermalization is a common process in statistical physics where a physical system reaches an equilibrium state defined by properties like temperature, even in isolated quantum many-body systems. However, many-body localization (MBL) can lead to the preservation of a non-thermal state. Recent theoretical work suggests that quantum many-body systems with a spatially increasing field, but without disorder, can also exhibit MBL, known as 'Stark MBL'. Studies with a trapped-ion quantum simulator have observed Stark MBL, showing that the quantum system can evade thermalization despite the absence of disorder.
Article
Quantum Science & Technology
Hong Liu, Shreya Vardhan
Summary: A universal approximation for Renyi entropies in a pure state at late times in a nonintegrable many-body system has been developed, which is independent of the details of the initial state and consistent with unitary time evolution. This approximation can be used to calculate entanglement entropies in gravity systems such as black holes, addressing the information loss paradox of Hawking, and providing a derivation of replica wormholes in recent models.
Article
Materials Science, Multidisciplinary
Michael Sonner, Alessio Lerose, Dmitry A. Abanin
Summary: The many-body localized phase has unique properties, such as protection of quantum coherence, and can be studied through an influence matrix to understand its effects on the system, providing a new method for quantum simulations.
Article
Quantum Science & Technology
Yousef Abou El-Neaj, Cristiano Alpigiani, Sana Amairi-Pyka, Henrique Araujo, Antun Balaz, Angelo Bassi, Lars Bathe-Peters, Baptiste Battelier, Aleksandar Belic, Elliot Bentine, Jose Bernabeu, Andrea Bertoldi, Robert Bingham, Diego Blas, Vasiliki Bolpasi, Kai Bongs, Sougato Bose, Philippe Bouyer, Themis Bowcock, William Bowden, Oliver Buchmueller, Clare Burrage, Xavier Calmet, Benjamin Canuel, Laurentiu-Ioan Caramete, Andrew Carroll, Giancarlo Cella, Vassilis Charmandaris, Swapan Chattopadhyay, Xuzong Chen, Maria Luisa Chiofalo, Jonathon Coleman, Joseph Cotter, Yanou Cui, Andrei Derevianko, Albert De Roeck, Goran S. Djordjevic, Peter Dornan, Michael Doser, Ioannis Drougkakis, Jacob Dunningham, Ioana Dutan, Sajan Easo, Gedminas Elertas, John Ellis, Mai El Sawy, Farida Fassi, Daniel Felea, Chen-Hao Feng, Robert Flack, Chris Foot, Ivette Fuentes, Naceur Gaaloul, Alexandre Gauguet, Remi Geiger, Valerie Gibson, Gian Giudice, Jon Goldwin, Oleg Grachov, Peter W. Graham, Dario Grasso, Maurits Van der Grinten, Mustafa Guendogan, Martin G. Haehnelt, Tiffany Harte, Aurelien Hees, Richard Hobson, Jason Hogan, Bodil Holst, Michael Holynski, Mark Kasevich, Bradley J. Kavanagh, Wolf Von Klitzing, Tim Kovachy, Benjamin Krikler, Markus Krutzik, Marek Lewicki, Yu-Hung Lien, Miaoyuan Liu, Giuseppe Gaetano Luciano, Alain Magnon, Mohammed Attia Mahmoud, Sarah Malik, Christopher McCabe, Jeremiah Mitchell, Julia Pahl, Debapriya Pal, Saurabh Pandey, Dimitris Papazoglou, Mauro Paternostro, Bjoern Penning, Achim Peters, Marco Prevedelli, Vishnupriya Puthiya-Veettil, John Quenby, Ernst Rasel, Sean Ravenhall, Jack Ringwood, Albert Roura, Dylan Sabulsky, Muhammed Sameed, Ben Sauer, Stefan Alaric Schaffer, Stephan Schiller, Vladimir Schkolnik, Dennis Schlippert, Christian Schubert, Haifa Rejeb Sfar, Armin Shayeghi, Ian Shipsey, Carla Signorini, Yeshpal Singh, Marcelle Soares-Santos, Fiodor Sorrentino, Timothy Sumner, Konstantinos Tassis, Silvia Tentindo, Guglielmo Maria Tino, Jonathan N. Tinsley, James Unwin, Tristan Valenzuela, Georgios Vasilakis, Ville Vaskonen, Christian Vogt, Alex Webber-Date, Andre Wenzlawski, Patrick Windpassinger, Marian Woltmann, Efe Yazgan, Ming-Sheng Zhan, Xinhao Zou, Jure Zupan
EPJ QUANTUM TECHNOLOGY
(2020)
Article
Physics, Multidisciplinary
Luca Innocenti, Leonardo Banchi, Alessandro Ferraro, Sougato Bose, Mauro Paternostro
NEW JOURNAL OF PHYSICS
(2020)
Article
Physics, Particles & Fields
Sougato Bose, Anupam Mazumdar, Marko Toros
Summary: The coupling between gravity and matter provides a hint for the infrared length scale in theories of gravity. By studying the relationship between gravitons and the number of particles, this length scale can be determined, which is also applicable in higher curvature theories of gravity.
Article
Physics, Multidisciplinary
Victor Montenegro, Gareth Sion Jones, Sougato Bose, Abolfazl Bayat
Summary: This study introduces a new method to achieve quantum-enhanced sensitivity in a many-body probe by utilizing the nature of quantum measurement without prior entanglement. By performing a sequence of local measurements, the sensing precision can be improved, reaching the Heisenberg limit.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Sougato Bose, Anupam Mazumdar, Martine Schut, Marko Toros
Summary: The Einstein equivalence principle, which is based on the equality of gravitational and inertial mass, has been extensively tested and proven with high precision in classical setups. However, in this study, a quantum protocol is proposed to test the equivalence principle in the quantum regime by creating large spatial superposition states. This unique protocol provides a way to test the generalization of the weak equivalence principle through the observation of quantum entanglement.
Article
Physics, Multidisciplinary
Eva Kilian, Marko Toros, Frank F. Deppisch, Ruben Saakyan, Sougato Bose
Summary: We investigate the use of a macroscopic system in a quantum superposition as a detector for weakly interacting relativistic particles, specifically neutrinos scattering from a solid object. By assuming a nuclear fission reactor as the (anti)neutrino source, we use flux and cross-section estimates to determine the spatial separation and study the temporal behavior of the sensing system. We find that an observable relative phase between quantum superposed components can be achieved for a gram-scale mass separated by 10-14 m with appropriate cooling and background suppression.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Dylan Lewis, Joao P. Moutinho, Antonio T. Costa, Yasser Omar, Sougato Bose
Summary: This article presents a simple protocol for transferring encoded logical qubits in quantum dot arrays and calculates the energetic cost of this protocol. The results show that only this protocol can manage constant dissipation, reducing cooling requirements and constraints on quantum computers.
Article
Physics, Multidisciplinary
Ryan J. Marshman, Anupam Mazumdar, Ron Folman, Sougato Bose
Summary: This paper demonstrates the feasibility of constructing large spatial superpositions using achievable magnetic field gradients, which can be used for probing quantum mechanics, quantum aspects of general relativity, and sensing and constraining classical gravity.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Martine Schut, Jules Tilly, Ryan J. Marshman, Sougato Bose, Anupam Mazumdar
Summary: In this paper, a protocol called QGEM is proposed to test the quantum nature of gravity using the entanglement of qubits. By introducing a third mass with an embedded qubit, the entanglement generation rate can be improved and the setup becomes more resilient to decoherence. Compared to the two-qubit setup, the three-qubit setup requires more measurements but provides a promising avenue for implementing the QGEM experiment.
Article
Optics
B. D. Wood, S. Bose, G. W. Morley
Summary: Researchers propose a scheme to place a diamond with negatively charged nitrogen-vacancy centers in a macroscopic spatial superposition with a separation of over 250 nm, while utilizing dynamical decoupling.
Article
Optics
Oussama Houhou, Darren W. Moore, Sougato Bose, Alessandro Ferraro
Summary: This paper introduces a method for implementing universal quantum computation unconditionally using an integrated platform. Through the driven-dissipative dynamics of the opto- and electromechanical systems, the required non-Gaussian cluster states are deterministically prepared, and arbitrary Gaussian measurements on the cluster nodes are performed by continuously monitoring the output cavity field. The feasibility requirements of this approach have been analyzed in detail, suggesting that its building blocks are within reach of current technology.
Article
Optics
Jules Tilly, Ryan J. Marshman, Anupam Mazumdar, Sougato Bose
Summary: A theoretical and experimental protocol, known as quantum-gravity-induced entanglement of masses (QGEM), has been proposed to test the quantum nature of gravity. The study explores extending the QGEM experiment to multidimensional quantum objects and different experiment geometries, finding that parallel-placed qubits in spatial superposition can outperform other models under certain conditions. The results suggest that a specific setup with two qubits in spatial superposition can achieve entanglement faster than other models in realistic experimental scenarios.
Article
Astronomy & Astrophysics
Sougato Bose, Anupam Mazumdar, Marko Toros
Summary: The universal coupling of gravity and matter allows us to quantify quantum aspects of space-time by counting gravitons, with the number of gravitons indirectly constraining the system's gravitational entropy. Observations suggest that the number of gravitons saturates the Bekenstein bound, indicating that the gravitons in the observable Universe are always abundant.
Article
Optics
A. S. Maxwell, A. Serafini, S. Bose, C. Figueira de Morisson Faria
Summary: The study presents a theoretical framework to optimize and understand uncertainty in laser field parameters, particularly in attoscience strong-field ionization. By deriving Fisher information in the momentum basis, it is found that both quantum and classical information scales quadratically over time. The research demonstrates that high-resolution momentum spectroscopy can significantly reduce uncertainty in in situ measurements of laser intensity, with further potential improvements using optimal quantum measurements.
Article
Multidisciplinary Sciences
Yair Margalit, Or Dobkowski, Zhifan Zhou, Omer Amit, Yonathan Japha, Samuel Moukouri, Daniel Rohrlich, Anupam Mazumdar, Sougato Bose, Carsten Henkel, Ron Folman
Summary: The Stern-Gerlach effect, a century-old paradigm of quantum mechanics, has recently been evidenced as a fully coherent quantum process. A successful realization of a full-loop Stern-Gerlach interferometer for single atoms has shown potential in creating an interferometer for macroscopic objects doped with a single spin, leading to new fundamental probes at the interface of quantum mechanics and gravity.
