Article
Optics
Wei-Lin Mu, Xiao-Xuan Li, Xiao-Qiang Shao
Summary: We propose a cooling scheme to prepare stationary entanglement of neutral atoms in the Rydberg blockade regime by the combination of periodically collective laser pumping and dissipation. This protocol aims to stabilize the system into the desired steady state independently of the initial state, without requiring coherent addressing of individual neutral atoms or fine control of Rydberg interaction intensity, thus improving the feasibility of experiments in related fields.
Article
Optics
K. Wongcharoenbhorn, C. Koller, T. M. Fromhold, W. Li
Summary: We investigate the thermal Casimir-Polder (CP) potential of 87Rb atoms in Rydberg nS-states near single- and double-layer graphene, and briefly explore the lifetimes near graphene-hexagonal boron nitride (hBN) multilayered structures. The dependence of the CP potential on parameters such as atom-surface distance, temperature, principal quantum number n, and graphene Fermi energy are studied. We find that the CP potential is dominated by nonresonant and evanescent-wave terms in the nonretarded regime, while exhibiting spatial oscillations in the retarded regime.
Article
Physics, Multidisciplinary
Xiao-Jun Zhang, Huan Chang, Jia-Yao Huo, Jin-Hui Wu
Summary: This article investigates the four-wave mixing (FWM) nonlinearity in an ensemble of cold Rydberg atoms. It shows the existence of both local and much larger nonlocal nonlinearity, which can be further enhanced by increasing the atomic density. These findings are of great significance for applications in quantum information processing involving FWM nonlinearity, such as the generation of squeezed or entangled states.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
B. Kuehn, W. Vogel, V Thiel, S. Merkouche, B. J. Smith
Summary: Measures of quantum properties are essential for understanding the differences between quantum and classical systems, and quantifying resources for quantum technologies. By comparing different filtered versions of the Glauber-Sudarshan P function, this study explores their ability to reveal nonclassical effects of light. It is shown that non-Gaussian filtered quasiprobabilities can uncover significant nonclassical effects even at low efficiencies.
PHYSICAL REVIEW LETTERS
(2021)
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
Optics
Yucheng He, Jing-Xin Liu, F-Q Guo, L-L Yan, Ronghui Luo, Erjun Liang, S-L Su, M. Feng
Summary: The scheme proposed in this study combines Vitanov-style pulses and dressed-state-based shortcut to adiabaticity (STA) to achieve multiple-qubit quantum state transfer and quantum logic gate in Rydberg atoms. By using STA technology to reduce the population of Rydberg excited states, the scheme demonstrates robustness to spontaneous emission, while well-designed pulses help minimize control errors. The dressed-state method applied in the scheme allows for smoother quantum state transfer operations with high fidelity, and is faster than traditional shortcut to adiabaticity methods.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Ricardo Roman-Ancheyta, Michal Kolar, Giacomo Guarnieri, Radim Filip
Summary: The research demonstrates that steady-state coherence (SSC) can be generated through system-bath interactions, showing that quantum effects can emerge without external driving. The significant increase in SSC occurs when the target system collectively interacts with multiple bath elements simultaneously, and even a small number of bath elements interacting collectively with the target system can enhance SSC at nonzero temperatures at the expense of slight reduction in final state purity. The generation of SSC in the collision models is inevitably associated with a nonzero power input required to reach the steady state, although the energetic cost may be lower compared to interactions not generating SSC.
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
Physics, Multidisciplinary
Haowei Xu, Guoqing Wang, Changhao Li, Hua Wang, Hao Tang, Ariel Rebekah Barr, Paola Cappellaro, Ju Li
Summary: The initialization of nuclear spin to its ground state is challenging due to its small energy scale compared with thermal energy, even at cryogenic temperature. In this Letter, an optonuclear quadrupolar effect is proposed, where two-color optical photons can efficiently interact with nuclear spins. Leveraging such an optical interface, nuclear magnons, the collective excitations of nuclear spin ensemble, can be cooled down optically, which could facilitate the application of nuclear spins in quantum information science.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
A. Hovhannisyan, V Stepanyan, A. E. Allahverdyan
Summary: Linear optics imposes a more general relation than the second law of thermodynamics. For optical modes undergoing linear evolution, the photon number does not decrease if the evolution starts from a generalized diagonal state. This relation also holds for a wide range of initial states and leads to an increase in the Bose entropy of the modes. Nonlinear interactions between the modes can reverse the heating process and achieve cooling, decreasing the photon number and related noise in an equilibrium system of modes with different frequencies.
Article
Optics
Dhiya Varghese, Sebastian Wuster, Weibin Li, Rejish Nath
Summary: We analyze the formation of maximally entangled Rydberg atom pairs under the condition of atom-light detuning. While the populations reach a steady value at longer times, the phases continuously evolve, resulting in periodic oscillations in the entanglement entropy. The local unitary equivalence between the obtained maximally entangled states and the Bell states is verified by computing the polynomial invariants. Finally, we examine the impact of spontaneous emission from the Rydberg state of rubidium atoms on the correlation dynamics and demonstrate that the oscillatory dynamics persists for high-lying Rydberg states. Our study may provide avenues for generating maximally entangled states, quantum gates, and exotic quantum matter in arrays of Rydberg atoms through Landau Zener sweeps.
Article
Computer Science, Interdisciplinary Applications
Benjamin N. Miller, David H. Meyer, Teemu Virtanen, Christopher M. O'Brien, Kevin C. Cox
Summary: RydIQule is a numerical technique and Python software package for atomic and Rydberg spectroscopy. It efficiently generates Hamiltonians, semi-classical equations, and simulations, providing faster solutions compared to other programming languages.
COMPUTER PHYSICS COMMUNICATIONS
(2024)
Article
Optics
Hui-min Zhao, Xiao-jun Zhang, M. Artoni, G. c. la Rocca, Jin-hui Wu
Summary: Strongly correlated photon pairs can be generated with high rates and brightnesses using enhanced nonlocal optical nonlinearities in cold atoms, leading to a dark state with a large population imbalance. This scheme works with resonant light fields, while minimizing linear absorption and Raman gain.
Article
Physics, Multidisciplinary
Tim Menke, William P. Banner, Thomas R. Bergamaschi, Agustin Di Paolo, Antti Vepsalainen, Steven J. Weber, Roni Winik, Alexander Melville, Bethany M. Niedzielski, Danna Rosenberg, Kyle Serniak, Mollie E. Schwartz, Jonilyn L. Yoder, Alan Aspuru-Guzik, Simon Gustavsson, Jeffrey A. Grover, Cyrus F. Hirjibehedin, Andrew J. Kerman, William D. Oliver
Summary: This study presents a superconducting circuit architecture that enables two-local and three-local interactions between three flux qubits through a designed coupling module. The system Hamiltonian is estimated using multiqubit pulse sequences implementing Ramsey-type interferometry. The three-local interaction can be coherently tuned over several MHz via the coupler flux biases and can also be turned off. This research has significant applications in quantum annealing, analog quantum simulation, and gate-model quantum computation.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Sutapa Ghosh, Nicholas Rivera, Gadi Eisenstein, Ido Kaminer
Summary: The generation of entangled photons from Rydberg atom cavity quantum electrodynamics is an efficient approach for producing entangled photons at telecommunications wavelengths. Exciting atoms to Rydberg states and using two-photon emission leads to the production of high-dimensionally entangled photons, with potential applications in high information capacity quantum communication.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Correction
Multidisciplinary Sciences
W. Morong, F. Liu, P. Becker, K. S. Collins, L. Feng, A. Kyprianidis, G. Pagano, T. You, A. V. Gorshkov, C. Monroe
Article
Physics, Multidisciplinary
Nishad Maskara, Abhinav Deshpande, Adam Ehrenberg, Minh C. Tran, Bill Fefferman, Alexey Gorshkov
Summary: In this study, we classify phases of a bosonic lattice model based on the computational complexity of classically simulating the system. We find that the system transitions from being classically simulable to classically hard to simulate as it evolves in time. By constructing a complexity phase diagram and deriving analytic bounds on the phase boundary, we uncover the intimate relationship between the location of the phase transition and quantum correlations spread and quantum information transfer. Additionally, we discover two types of transitions, sharp and coarse, corresponding to interacting and noninteracting bosons, respectively.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Aaron W. Young, William J. Eckner, Nathan Schine, Andrew M. Childs, Adam M. Kaufman
Summary: Quantum walks provide an intuitive and universal framework for designing quantum algorithms, allowing programmable modification of the walker's graph while maintaining coherence. In this study, we combine the control of optical tweezers with the environment of an optical lattice to investigate continuous-time quantum walks of single atoms on a square lattice and demonstrate spatial search. These capabilities can be extended to study various problems in quantum information science, including more effective spatial search using larger, more connected graphs.
Article
Quantum Science & Technology
Aniruddha Bapat, Andrew M. Childs, Alexey V. Gorshkov, Eddie Schoute
Summary: The SWAP gate is a classical operation that can be considered as a tool for moving information on quantum hardware. However, genuine quantum operations have the potential to outperform SWAP in terms of qubit permutation within an architecture, which is known as routing. We explore quantum routing in two models, allowing either arbitrary two-qubit unitaries or Hamiltonians with norm-bounded interactions. Through spectral analysis of graphs representing interaction constraints, we provide lower bounds for the circuit depth or time of quantum routing and a generalized upper bound for all simple connected n-vertex graphs. Additionally, we identify conditions for a superpolynomial classical-quantum routing separation, excluding graphs with a small spectral gap and graphs of bounded degree. Finally, we demonstrate examples of quadratic separation between gate-based and Hamiltonian routing models, with a constant number of local ancillas per qubit, as well as an O(n) speedup with fast local interactions.
Article
Physics, Multidisciplinary
Kevin C. Cox, Przemyslaw Bienias, David H. Meyer, Donald P. Fahey, Paul D. Kunz, Alexey Gorshkov
Summary: We present a method for network-capable quantum computing based on holographic spin-wave excitations collectively stored in qubit ensembles. By applying phase shifts in momentum and position space, high-fidelity linear controllability can be achieved without requiring single-site addressability or high single-qubit cooperativity. We propose a lambda scheme in a rubidium-atom system for linear quantum processing and calculate the expected experimental operational fidelities. Additionally, we propose using the spin-wave processor for continuous-variable quantum information processing and present a scheme for generating large dual-rail cluster states for deterministic computing.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Mathias Van Regemortel, Oles Shtanko, Luis Pedro Garcia-Pintos, Abhinav Deshpande, Hossein Dehghani, Alexey Gorshkov, Mohammad Hafezi
Summary: In this paper, the dynamics of open quantum systems is studied using a simple model of uncoupled emitters. The recovery of lost information is shown to depend on the monitoring scheme applied, and the entanglement in trajectory states induced by registering the sequence of clicks from spontaneously emitted photons through a linear optical interferometer is demonstrated. The equivalence between the model and Fock-state boson sampling is also discussed, linking the hardness of sampling the outcomes of quantum jumps with the scaling of trajectory entanglement.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Marcin Kalinowski, Yidan Wang, Przemyslaw Bienias, Michael J. Gullans, D. P. Ornelas-Huerta, Alexander N. Craddock, Steven L. Rolston, J. V. Porto, Hans Peter Buechler, Alexey V. Gorshkov
Summary: Research shows that three-body interactions in Rydberg polaritons may result in stronger forces in dissipative states, an area that still requires further exploration. By applying renormalization group techniques, the shape and strength of dissipative three-body forces can be enhanced, and these interactions can be related to single-mode cavity transmission.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Yidan Wang, Michael J. Gullans, Xuesen Na, Seth Whitsitt, Alexey Gorshkov
Summary: In this study, we investigate single-particle scattering in general spatial dimension D >= 1 when the density of states diverges at a specific energy. By focusing on waveguide quantum electrodynamics (QED) problems with a specific dispersion relation, we rigorously prove that the S matrix converges to a universal limit dependent only on certain parameters. This study also extends a key index theorem in quantum scattering theory known as Levinson's theorem to waveguide QED scattering with more general dispersion relations.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Or Katz, Roy Shaham, Eran Reches, Alexey Gorshkov, Ofer Firstenberg
Summary: This article outlines and characterizes methods for mapping the state of photons onto collective states of noble-gas spins, which are long-lived but optically inaccessible. The mapping is achieved through coherent spin-exchange interaction arising from random collisions with alkali vapor.
Article
Materials Science, Multidisciplinary
Igor Boettcher, Alexey Gorshkov, Alicia J. Kollar, Joseph Maciejko, Steven Rayan, Ronny Thomale
Summary: This study introduces a crystallography of hyperbolic lattices, uncovering their hidden crystal structure and simplifying the computation of their energy spectra. It has high potential for applications and is based on the mathematical framework of higher-genus Riemann surfaces and Fuchsian groups.
Article
Materials Science, Multidisciplinary
Simon Lieu, Max McGinley, Oles Shtanko, Nigel R. Cooper, Alexey Gorshkov
Summary: This study shows that the generator of dynamics for Markovian open fermionic systems can exhibit a degeneracy, which is protected by both time-reversal symmetry and the microreversibility property of systems at thermal equilibrium.
Article
Physics, Multidisciplinary
Aniruddha Bapat, Eddie Schoute, Alexey Gorshkov, Andrew M. Childs
Summary: The study introduces a time-independent Hamiltonian protocol for the reversal of qubit ordering in a chain of spins, achieving faster state reversal than a naive approach using SWAP gates. By proving lower bounds on state reversal using entanglement capacity results, the protocol demonstrates advantages in implementing state reversal and offers extensions to other types of Hamiltonian protocols.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Christopher M. Langlett, Zhi-Cheng Yang, Julia Wildeboer, Alexey Gorshkov, Thomas Iadecola, Shenglong Xu
Summary: This study develops a generic construction that embeds a new class of quantum many-body scars, called rainbow scars, into the spectrum of an arbitrary Hamiltonian. Unlike other examples of quantum many-body scars, rainbow scars display extensive bipartite entanglement entropy and can occur multiple times or even throughout the spectrum in the presence of internal symmetries.
Correction
Optics
Zachary Eldredge, Michael Foss-Feig, Jonathan A. Gross, S. L. Rolston, Alexey V. Gorshkov
