Article
Physics, Multidisciplinary
Nikolaus Lorenz, Lorenzo Festa, Lea-Marina Steinert, Christian Gross
Summary: Single neutral atoms trapped in optical tweezers and laser-coupled to Rydberg states provide a fast and flexible platform to generate configurable atomic arrays for quantum simulation. Raman sideband cooling can overcome limitations in experiments requiring continuous trapping, preparing the stage for Rydberg dressing in tweezer arrays.
Article
Physics, Multidisciplinary
E. Crane, A. Schuckert, N. H. Le, A. J. Fisher
Summary: In this paper, a Rydberg entangling gate scheme is proposed, which theoretically demonstrates an order-of-magnitude improvement in fidelities and speed over existing cold atom protocols. By utilizing the natural properties of donors in silicon, the scheme aims to overcome the strenuous requirements of existing technologies. The ultrafast gate operation on the order of picoseconds is achievable, showing great potential for practical applications.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Martin Lanthaler, Clemens Dlaska, Kilian Ender, Wolfgang Lechner
Summary: We propose a scalable architecture to solve higher-order constrained binary optimization (HCBO) problems on current neutral-atom hardware using the Rydberg blockade regime. We formulate the parity encoding of arbitrary connected HCBO problems as a maximum-weight independent set (MWIS) problem on disk graphs, which can be directly encoded on the hardware. Our architecture is built from small MWIS modules in a problem-independent way, ensuring practical scalability.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Charles Fromonteil, Dolev Bluvstein, Hannes Pichler
Summary: We present a new family of protocols for entangling gates for neutral atom qubits using the Rydberg blockade mechanism. These protocols implement controlled-phase gates through a series of global laser pulses resonant with the Rydberg excitation frequency. We analyze the robustness of these protocols against calibration errors and laser intensity fluctuations, and demonstrate their robustness in various fidelity measures. Furthermore, we discuss adaptations of these protocols to ensure robustness against atomic-motion-induced Doppler shifts.
Article
Physics, Multidisciplinary
Minhyuk Kim, Kangheun Kim, Jaeyong Hwang, Eun-Gook Moon, Jaewook Ahn
Summary: The study presents an experimental protocol based on Rydberg atoms to solve combinatorial optimization problems. The researchers tested the protocol on three-dimensional Rydberg atom arrays and successfully found the maximum independent set solutions.
Article
Optics
Anupam Mitra, Sivaprasad Omanakuttan, Michael J. Martin, Grant W. Biedermann, Ivan H. Deutsch
Summary: This paper revisits the implementation of a two-qubit entangling gate called Mt lmer-St rensen gate using adiabatic Rydberg dressing for neutral atoms. The study shows that rapid adiabatic passage can be achieved through a two-photon transition without the need for an ultraviolet laser, by simply modulating the amplitude of one field with fixed laser frequencies. The results demonstrate that entangling gate fidelities comparable to the one-photon excitation can be achieved with the two-photon excitation. Furthermore, the paper explores how the adiabatic dressing protocol can be used to implement entangling gates beyond the regime of a perfect Rydberg blockade, allowing for fast high-fidelity gates for atoms separated beyond the blockade radius.
Article
Physics, Applied
Nikunjkumar Prajapati, Amy K. Robinson, Samuel Berweger, Matthew T. Simons, Alexandra B. Artusio-Glimpse, Christopher L. Holloway
Summary: This study demonstrates improved sensitivity of Rydberg electrometry based on electromagnetically induced transparency (EIT) with a ground state repumping laser, which enhances the interaction strength without additional Doppler or power broadening. The nearly doubled EIT amplitude without increased peak width is achieved through this method, showing that similar amplitude increase without repumping field is not possible through simple optimization. The study also identifies photon shot noise of the probe laser as a key limit to detection sensitivity, and shows a nearly 2x improvement in sensitivity with the presence of the repump field.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Jiabei Fan, Yuechun Jiao, Changcheng Li, Jingxu Bai, Jianming Zhao, Suotang Jia
Summary: This study demonstrates a robust single-photon Ramsey interferometer based on a single Rydberg excitation, where the photon is stored as a Rydberg polariton in an ensemble of atoms. By converting the photon to a Rydberg polariton, the interferometer can split and combine the incoming photon, constructing two paths for interference. The demonstration of Ramsey interference fringes and robustness testing show potential applications of this interferometer in quantum precision measurement.
Article
Optics
Mathieu Barbier, Simon Hollerith, Walter Hofstetter
Summary: This work proposes the use of bosonic quantum gases dressed with molecular bound states in Rydberg interaction potentials to observe novel phases of matter in extended Hubbard models. It studies the molecular Rabi coupling with respect to the effective principal quantum number and trapping frequency of ground-state atoms, as well as the resulting dressed interaction strength. Additionally, a two-color excitation scheme is proposed to enhance dressed interaction and cancel ac Stark shifts.
Article
Quantum Science & Technology
Sven Jandura, Jeff D. Thompson, Guido Pupillo
Summary: Researchers introduced a new gate sequence that is robust against intensity inhomogeneity and Doppler shifts, reducing the sensitivity of gate operations in neutral-atom qubits to experimental imperfections. The gates outperform existing ones for moderate or large imperfections, and show improved performance even for very small imperfections when applied to erasure-biased qubits based on metastable 171Yb.
Article
Physics, Multidisciplinary
Mohammadsadegh Khazali
Summary: The advances in ultracold atoms and atomic traps have led to new controllable long-range interactions, which are expected to expand the range of possible quantum algorithms and provide new control mechanisms for quantum technology. This Letter presents a method for generating special interatomic interactions between Rydberg-dressed atoms by manipulating the lasers' linewidth, offering a valuable interaction toolbox for quantum technology. Applications of this method in creating stable gigantic three-dimensional soliton molecules and forming quasiperiodic droplet crystals are discussed.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Xiao-Feng Shi
Summary: This paper presents two solutions to the challenge of Rydberg excitation in alkaline-earth-like atoms with complicated nuclear spin states. The first theory involves exciting two nuclear spin qubit states to Rydberg states with detuning from a weak magnetic field, while the second theory demonstrates a two-photon Rydberg excitation with only one nuclear spin qubit state. These theories offer a versatile approach to quantum computation leveraging Rydberg blockade and nuclear-spin quantum memory advantages.
FRONTIERS OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Yi-Quan Zou, Moritz Berngruber, Viraatt S. V. Anasuri, Nicolas Zuber, Florian Meinert, Robert Loew, Tilman Pfau
Summary: Vibrational dynamics in conventional molecules usually occur on a picosecond or shorter timescale. However, ultralong-range Rydberg molecules exhibit dramatically slowed down dynamics due to their large bond length of up to several micrometers. In this study, we directly observe the vibrational dynamics of a recently discovered Rydberg-atom-ion molecule. By applying a weak external electric field, we are able to control the molecule's orientation and induce vibrational dynamics. Our research opens up opportunities for controlling molecular dynamics in Rydberg molecules.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Miguel Bello, Monica Benito, Martin J. A. Schuetz, Gloria Platero, Geza Giedke
Summary: We propose a protocol for generating entanglement between two ensembles of nuclear spins surrounding two distant quantum dots. The protocol involves injecting polarized electrons, interacting sequentially with the nuclear ensembles of each quantum dot, and transferring each electron coherently from one quantum dot to the other.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Chengshu Li, Fan Yang
Summary: In this paper, the authors explore the Lee-Yang (LY) zeros in classical Rydberg blockade models, motivated by recent progress in cold Rydberg atom experiments. They find that the distribution of partition function zeros for these models in one dimension (1d) can be analytically obtained, and prove that all LY zeros are real and negative for models with arbitrary blockade radii. Therefore, no phase transitions occur in 1d classical Rydberg chains. The authors also investigate how these zeros redistribute as different blockade radii are interpolated, and discuss possible experimental measurements for these zeros.
FRONTIERS OF PHYSICS
(2023)
Article
Optics
Lukas Medisauskas, Ulf Saalmann, Jan-Michael Rost
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2019)
Article
Optics
Kiyoshi Ueda, Emma Sokell, Stefan Schippers, Friedrich Aumayr, Hossein Sadeghpour, Joachim Burgdoerfer, Christoph Lemell, Xiao-Min Tong, Thomas Pfeifer, Francesca Calegari, Alicia Palacios, Fernando Martin, Paul Corkum, Giuseppe Sansone, Elena Gryzlova, Alexei N. Grum-Grzhimailo, Maria Novella Piancastelli, Peter M. Weber, Tobias Steinle, Kasra Amini, Jens Biegert, Nora Berrah, Edwin Kukk, Robin Santra, Alfred Mueller, Danielle Dowek, Robert R. Lucchese, C. William McCurdy, Paola Bolognesi, Lorenzo Avaldi, Till Jahnke, Markus S. Schoeffler, Reinhard Doerner, Yann Mairesse, Laurent Nahon, Olga Smirnova, Thomas Schlatholter, Eleanor E. B. Campbell, Jan-Michael Rost, Michael Meyer, Kazuo A. Tanaka
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2019)
News Item
Optics
Jan M. Rost, Ulf Saalmann
Article
Multidisciplinary Sciences
J. Andersson, S. Zagorodskikh, A. Hult Roos, O. Talaee, R. J. Squibb, D. Koulentianos, M. Wallner, V Zhaunerchyk, R. Singh, J. H. D. Eland, J. M. Rost, R. Feifel
SCIENTIFIC REPORTS
(2019)
Article
Optics
Matthew T. Eiles, Andrew L. Hunter, Jan M. Rost
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2020)
Article
Physics, Multidisciplinary
Jonathan Dubois, Ulf Saalmann, Jan M. Rost
Summary: In this study, the semi-classical Lindblad master equation is derived in phase space for both canonical and non-canonical Poisson brackets using the Wigner-Moyal formalism and the Moyal star-product. The analysis generalizes the classical limit of the Fokker-Planck equation to non-canonical Poisson brackets, such as gyro-Poisson brackets. The equations of motion for collective spin variables are shown to be governed by the Bloch equations of nuclear magnetization with relaxation in this framework.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Physics, Multidisciplinary
Adam Piechaczek, Christof Bartels, Christian Hock, Jan-Michael Rost, Bernd von Issendorff
Summary: The study reveals that the angular distribution of photoelectrons emitted from copper and sodium cluster anions exhibit a universal behavior independent of various factors, primarily due to momentum conservation during photoemission. Quantum simulations demonstrate that emission actually occurs on the surface of clusters under multielectron dynamics, rendering the cluster opaque to photoelectrons and eliminating interference effects.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Jonathan Dubois, Ulf Saalmann, Jan Michael Rost
Summary: The preservation of coherence in open systems is a fundamental phenomenon related to the symmetries of the system Hamiltonian and its coupling to the environment. By introducing ghost variables, we distinguish between local and global decoherence-free subspaces for many-body systems, where the coupling to the environment depends solely on these variables. The construction of these variables is facilitated in classical phase space and can be transferred to quantum mechanics using the equivalence of Poisson and Lie algebras for symmetries in classical and quantum mechanics. Examples are provided for an interacting spin system.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Optics
Chuan Yu, Ulf Saalmann, Jan M. Rost
Summary: Backscattering of delocalized electrons has been found to enhance high-order harmonic generation in periodic systems with broken translational symmetry. This study explores the effect of variable spatial gaps in an atomic chain and identifies two mechanisms, backscattering and enhanced tunneling from an impurity state, that contribute to the enhanced harmonic generation.
Article
Chemistry, Physical
Ulf Saalmann, Jan Michael Rost
Summary: We elucidate the mechanism of strong laser pulse excitation in pristine graphene with multi-harmonic pulses and identify key conditions for achieving large valley polarization. A novel compacted representation is introduced to analyze the excitation dynamics and understand the effect of dephasing. We find that long wavelength and a moderate number of overtones in the harmonic pulse generate the largest valley polarizations.
FARADAY DISCUSSIONS
(2022)
Article
Physics, Multidisciplinary
Hamed Koochaki Kelardeh, Ulf Saalmann, Jan M. Rost
Summary: We identify and describe how intense short light pulses couple to massless Dirac fermions in two-dimensional systems. The resulting excitation dynamics exhibits unusual scaling with the wavelength of the light due to the linear dispersion and efficient light coupling near the Dirac points. We demonstrate substantial valley polarization using simple pulse shapes in gapless systems.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Chuan Yu, Ulf Saalmann, Jan M. Rost
Summary: It is demonstrated that electron backscattering can enhance high-order-harmonic generation in periodic systems with broken translational symmetry. By deriving a finite chain of atoms as a paradigm, the harmonic cutoff caused by electrons backscattered from the edges of the chain is explored, and it is shown that there is a maximum in the harmonic yield when the quiver amplitude of the driven electrons is twice the chain length. To gain an intuitive understanding of the quantum results, a refined semiclassical trajectory model with finite electron-hole separation after tunneling is developed. It is also demonstrated that the same tunnel exit applies to interband harmonics in conventional periodic solid-state systems.
Article
Optics
Ritesh Pant, Rajat Agrawal, Sebastian Wuster, Jan-Michael Rost
Summary: Highly excited Rydberg atoms in an ultracold gas can be set into motion by a combination of van der Waals and resonant dipole-dipole interactions. Nonadiabatic transitions may occur, especially when encountering a conical intersection. Using microwave resonance, almost all collisional ionization of Rydberg atoms can be traced back to prior nonadiabatic transitions, making nonadiabatic effects in Rydberg motion easier to demonstrate experimentally.
Article
Chemistry, Physical
Sajal Kumar Giri, Lazaro Alonso, Ulf Saalmann, Jan Michael Rost
Summary: The study utilizes deep neural networks to map fluctuating photo-electron spectra obtained from noisy pulses to noise-free pulses, successfully purifying the fluctuating spectra to Fourier-limited Gaussian pulse spectra and further investigating the predictive performance for double pulses, chirped pulses, and partially-coherent pulses.
FARADAY DISCUSSIONS
(2021)
Article
Optics
Sebastian Gemsheim, Jan-Michael Rost
