Article
Physics, Multidisciplinary
Leonardo De Carlo, William D. Wick
Summary: In a wavefunction-only philosophy, the thermodynamics of magnetic quantum spin models can be understood by constructing Gibbs ensembles. The study found that finite-temperature phase transitions do not occur in systems with distinguishable spins and free boundary conditions due to high dimensionality of the phase space. However, a variant model with additional wavefunction energy does exhibit a phase transition to a magnetized state. This suggests that magnetization in large wavefunction spin chains only occurs when considering indistinguishable particles and blocking macroscopic dispersion through energy conservation.
Article
Physics, Multidisciplinary
Benjamin Merkel, Pablo Cova Farina, Andreas Reiserer
Summary: Ensembles of dopants have wide applications in quantum technology, but the miniaturization of corresponding devices is hindered by dipolar interactions. Dynamical decoupling can alleviate the decoherence in crystals with strong anisotropic spin-spin interactions, originating from anisotropic g tensor, but cannot fully eliminate it. These findings can be extended to various quantum systems used for quantum sensing, microwave-to-optical conversion, and quantum memory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Chris Nill, Kay Brandner, Beatriz Olmos, Federico Carollo, Igor Lesanovsky
Summary: When atoms are excited to high-lying Rydberg states, their interactions with dipolar forces play a significant role. These interactions not only affect the dissipative effects caused by the coupling of Rydberg atoms with the surrounding electromagnetic field, but also modify the frequency of emitted photons, making it dependent on the local neighborhood of the emitting atom. The interactions among Rydberg atoms accelerate decoherence and affect dissipative phase transitions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Wenchao Xu, Aditya V. Venkatramani, Sergio H. Cantu, Tamara Sumarac, Valentin Kluesener, Mikhail D. Lukin, Vladan Vuletic
Summary: A new approach is demonstrated for fast preparation, manipulation, and collective readout of an atomic Rydberg-state qubit, achieving high success probability and fidelity. The method enables faster detection and repeated nondestructive measurement, with potential applications in quantum information processing and error correction.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Ruben Verresen, Ashvin Vishwanath
Summary: The study unifies different approaches to quantum spin liquids and proposes a parent Hamiltonian that stabilizes deconfinement through local fluctuations of anyons. By investigating models such as kagome triangles and the ruby lattice, connections between them under different parameters are discovered. Additionally, a relationship between Kitaev couplings and repulsive interactions used for emergent dimer models is found.
Article
Chemistry, Multidisciplinary
Samuel Lenz, Dennis Koenig, David Hunger, Joris van Slageren
Summary: Although quantum computing has made great progress recently, the development of quantum memories has not kept pace. Current quantum memories require cryogenic temperatures and expensive peripheral hardware, but new research shows that ensembles of weakly coupled molecular spins can operate at room temperature and be used to store microwave pulses.
ADVANCED MATERIALS
(2021)
Article
Physics, Multidisciplinary
Marcin Kalinowski, Nishad Maskara, Mikhail D. Lukin
Summary: Understanding topological matter is a difficult task in physical science, but programmable quantum simulators have emerged as a powerful tool for studying these systems. This study introduces and analyzes a new method for simulating topological matter using periodic driving. The researchers show that this approach can efficiently explore topological phases of matter and provide insights for further research on materials and lattice gauge theories by utilizing programmable quantum simulators.
Article
Mechanics
Mamta Gautam, Nitesh Jaiswal, Ankit Gill, Tapobrata Sarkar
Summary: We study information theoretic quantities in models with three and four spin interactions, which show distinctive characteristics compared to their nearest neighbour counterparts. The Nielsen complexity (NC), Fubini-Study complexity (FSC), and entanglement entropy (EE) are quantified to measure these characteristics. The models have a rich phase structure, different from ones with nearest neighbour interactions, which results in different behavior of information theoretic quantities. For example, the derivative of NC does not diverge but shows a discontinuity near continuous phase transitions, and the FSC may be regular and continuous across such transitions. In addition, the EE exhibits novel discontinuity at first and second order quantum phase transitions.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2023)
Article
Multidisciplinary Sciences
D. Bluvstein, A. Omran, H. Levine, A. Keesling, G. Semeghini, S. Ebadi, T. T. Wang, A. A. Michailidis, N. Maskara, W. W. Ho, S. Choi, M. Serbyn, M. Greiner, V. Vuletic, M. D. Lukin
Summary: The study demonstrates that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving, generating a robust subharmonic response akin to discrete timecrystalline order. This finding provides new ways to control complex dynamics in many-body systems and may have potential applications in quantum information science.
Article
Chemistry, Multidisciplinary
Hyun-Joo Koo, Reinhard K. Kremer, Myung-Hwan Whangbo
Summary: We investigated the interactions that control the sign and strength of interlayer coupling in van der Waals ferromagnets and found that high-spin orbital interactions are crucial for understanding their ferromagnetism. The results explain several puzzling observations in these materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Xingchang Wang, Jianmin Wang, Ying Zuo, Liang Dong, Georgios A. Siviloglou, Jiefei Chen
Summary: The researchers experimentally demonstrated a new spin wave thermometry method that can measure the temperature of a cold atomic ensemble optical quantum memory. This technique is highly suitable for probing the atomic motion in elongated clouds, which are commonly used in quantum memories, and can provide comparable precision for different types of memories.
Review
Automation & Control Systems
Jr-Shin Li, Wei Zhang, Yuan-Hung Kuan
Summary: This paper presents a distinct perspective for understanding and controlling quantum ensemble systems by transforming them to a space with reduced dimensions and distinctive network structures through the introduction of moment representations. The technique of moment quantization enables the control of spin ensembles through the control of their moment systems, leading to a new control analysis and design paradigm for quantum ensemble systems based on truncated moment systems.
ANNUAL REVIEWS IN CONTROL
(2022)
Article
Quantum Science & Technology
Lida Zhang, Valentin Walther, Klaus Molmer, Thomas Pohl
Summary: We investigate the interaction of weak light fields with two-dimensional lattices of atoms with high lying atomic Rydberg states. By analyzing their interplay, we identify conditions that yield a nonlinear quantum mirror which splits incident fields into correlated photon-pairs while transmitting single photons unaffected. Such strong photon-photon interactions in the absence of photon losses open up promising avenues for the generation and manipulation of quantum light, and the exploration of many-body phenomena with interacting photons.
Article
Quantum Science & Technology
Zeyang Li, Boris Braverman, Simone Colombo, Chi Shu, Akio Kawasaki, Albert F. Adiyatullin, Edwin Pedrozo-Penafiel, Enrique Mendez, Vladan Vuletic
Summary: In a high-finesse optical cavity, the interaction between an atomic ensemble and a light mode easily reaches the strong-coupling regime, where quantum effects dominate. This interaction can generate both atom-light and atom-atom entanglement, and conditions are determined to maximize the entanglement-induced gain in quantum sensors and atomic clocks.
Article
Physics, Multidisciplinary
C. J. Turner, J-Y Desaules, K. Bull, Z. Papic
Summary: The text explains key concepts and findings in the theory of quantum scarring, demonstrating that quasimodes arise from previously established periodic orbits when quantum fluctuations are restored. The results shed light on the role of the TDVP classical system in Rydberg atom chains and its impact on the system.
Article
Optics
Khoa Anh Tran, Khuong Ba Dinh, Peter Hannaford, Lap Van Dao
Article
Physics, Multidisciplinary
A. Arias, G. Lochead, T. M. Wintermantel, S. Helmrich, S. Whitlock
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
S. Whitlock, H. Wildhagen, H. Weimer, M. Weidemueller
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
S. Helmrich, A. Arias, G. Lochead, T. M. Wintermantel, M. Buchhold, S. Diehl, S. Whitlock
Article
Physics, Multidisciplinary
T. M. Wintermantel, Y. Wang, G. Lochead, S. Shevate, G. K. Brennen, S. Whitlock
PHYSICAL REVIEW LETTERS
(2020)
Biographical-Item
Spectroscopy
Peter Hannaford, Barry Sturman
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2020)
Article
Physics, Multidisciplinary
Krzysztof Giergiel, Tien Tran, Ali Zaheer, Arpana Singh, Andrei Sidorov, Krzysztof Sacha, Peter Hannaford
NEW JOURNAL OF PHYSICS
(2020)
Article
Physics, Multidisciplinary
K. Mukherjee, H. P. Goswami, S. Whitlock, S. Wuster, A. Eisfeld
NEW JOURNAL OF PHYSICS
(2020)
Article
Quantum Science & Technology
Yibo Wang, Sayali Shevate, Tobias Martin Wintermantel, Manuel Morgado, Graham Lochead, Shannon Whitlock
NPJ QUANTUM INFORMATION
(2020)
News Item
Optics
Lap Van Dao, Peter Hannaford
Article
Physics, Multidisciplinary
Jia Wang, Peter Hannaford, Bryan J. Dalton
Summary: A fully comprehensive multi-mode quantum treatment based on truncated Wigner approximation (TWA) was used to study many-body effects and quantum fluctuations on the formation of a discrete time crystal (DTC) in a Bose-Einstein condensate (BEC) bouncing on a periodically driven atom mirror. The study showed that TWA approach can provide accurate predictions and observed the possibility of creating a stable DTC based on repulsive interactions. Additionally, the dynamical behavior of the system was found to be largely independent of whether the boson-boson interaction is attractive or repulsive, indicating the robustness of the system.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
K. Klocke, T. M. Wintermantel, G. Lochead, S. Whitlock, M. Buchhold
Summary: Signatures of self-organized criticality have been observed in an ultracold atomic gas, with an unanticipated feedback mechanism identified from the interaction of the system with a thermal reservoir. Transport of particles from the flanks of the cloud towards the center compensates avalanche-induced atom loss, sustaining an extended critical region in the trap center for longer timescales. This mechanism provides an experimental signature for SOC and enables studies under almost homogeneous conditions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Peter Hannaford, Krzysztof Sacha
Proceedings Paper
Optics
T. Tran, Y. Wang, I. Herrera, A. Balcytis, D. Nissen, M. Albrecht, S. Whitlock, A. Sidorov, P. Hannaford
AOS AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (ACOFT) AND AUSTRALIAN CONFERENCE ON OPTICS, LASERS, AND SPECTROSCOPY (ACOLS) 2019
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Khuong Ba Dinh, Khoa Anh Tran, Peter Hannaford, Lap Van Dao
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)