Article
Physics, Multidisciplinary
Y. Mei, Y. Li, H. Nguyen, P. R. Berman, A. Kuzmich
Summary: Researchers have created a special two-level system in an ensemble of several hundred atoms and observed oscillations between the ground state and collective Rydberg state. They have also obtained the light shifts of the qubits using interference techniques and derived an effective two-level model that agrees well with their observations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
R. Srinivas, S. C. Burd, H. M. Knaack, R. T. Sutherland, A. Kwiatkowski, S. Glancy, E. Knill, D. J. Wineland, D. Leibfried, A. C. Wilson, D. T. C. Allcock, D. H. Slichter
Summary: Researchers have successfully demonstrated high-fidelity laser-free universal control of two trapped-ion qubits by utilizing microwave technology combined with radiofrequency magnetic field gradients. This technology allows for simultaneous entangling operations on multiple pairs of ions without increasing control signal power or complexity.
Article
Optics
R. T. Sutherland, R. Srinivas, D. T. C. Allcock
Summary: We propose a scheme for individual addressing of trapped ion qubits based on their motional frequency. We demonstrate that geometric phase gates can be achieved by the coherent interference of spin-independent and (global) spin-dependent forces. We show analytically and numerically that the use of spin-independent forces generated by localized electric fields can increase gate speed and reduce sensitivity to motional decoherence. Numerical simulations of a laser-free implementation show cross-talk errors below 10-6 for reasonable parameters.
Article
Physics, Multidisciplinary
Wentao Chen, Yao Lu, Shuaining Zhang, Kuan Zhang, Guanhao Huang, Mu Qiao, Xiaolu Su, Jialiang Zhang, Jing-Ning Zhang, Leonardo Banchi, M. S. Kim, Kihwan Kim
Summary: A minimal-loss programmable phononic network is demonstrated, which can deterministically prepare and detect any phononic state. The network can be extended to reveal quantum advantage and has high reconstruction fidelities for both single- and two-phonon states.
Article
Physics, Multidisciplinary
V. Krutyanskiy, M. Galli, V. Krcmarsky, S. Baier, D. A. Fioretto, Y. Pu, A. Mazloom, P. Sekatski, M. Canteri, M. Teller, J. Schupp, J. Bate, M. Meraner, N. Sangouard, B. P. Lanyon, T. E. Northup
Summary: We present a primary quantum network consisting of two atomic ions separated by 230 m. The ions are trapped in different buildings and connected via 520(2) m of optical fiber. At each network node, the electronic state of an ion is entangled with the polarization state of a single cavity photon, and photon detection heralds entanglement between the two ions. Fidelities of up to (88.0 + 2.2 - 4.7)% are achieved, with a success probability of 4 x 10-5, paving the way for long-distance networks of entangled quantum processors.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Chung-Hsien Wang, Yi-Cheng Wang, Chi-Chih Chen, Chun-Che Wang, H. H. Jen
Summary: We demonstrate an enhanced dark-state sideband cooling in trapped atoms utilizing photon-mediated dipole-dipole interactions among them. By placing the atoms at the magic interparticle distances, we achieve an outperformed cooling behavior in the target atom that surpasses the limit of a single atom. Our results provide insights into subrecoil cooling of atoms with collective and light-induced long-range dipole-dipole interactions and pave the way for implementing genuine quantum operations in multiple quantum registers.
Article
Multidisciplinary Sciences
Pavel Hrmo, Benjamin Wilhelm, Lukas Gerster, Martin W. van Mourik, Marcus Huber, Rainer Blatt, Philipp Schindler, Thomas Monz, Martin Ringbauer
Summary: Quantum information carriers naturally occupy high-dimensional Hilbert spaces, and high-dimensional (qudit) quantum systems are becoming a powerful resource for quantum processors. Generating the desired interaction efficiently in these systems is crucial. In this study, the authors demonstrate the implementation of a native two-qudit entangling gate up to dimension 5 in a trapped-ion system. They use a light-shift gate mechanism to generate genuine qudit entanglement in a single application of the gate, which seamlessly adapts to the local dimension of the system with a calibration overhead independent of the dimension. Native entangling techniques for qudits are important for encoding quantum information.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jacob Whitlow, Zhubing Jia, Ye Wang, Chao Fang, Jungsang Kim, Kenneth R. Brown
Summary: This article presents a quantum simulation of conical intersections using a trapped atomic ion system, and experimentally observes the manifestation of geometric phase, demonstrating the advantage of combining spin and motion for quantum simulation of chemical reactions.
Article
Optics
Allison L. Carter, Sean R. Muleady, Athreya Shankar, Jennifer F. Lilieholm, Bryce B. Bullock, Matthew Affolter, Ana Maria Rey, John J. Bollinger
Summary: In this study, we theoretically investigate the impact of spontaneous emission on quantum gate operations with trapped-ion ground-state Zeeman qubits in a high magnetic field. We compare the performance of two types of gates and explore different operating points. Our results show that both gate types can achieve similar performance at high magnetic fields.
Article
Physics, Multidisciplinary
Stefan Richter, Sebastian Wolf, Joachim von Zanthier, Ferdinand Schmidt-Kaler
Summary: Cross-correlation signals are analyzed to determine spatial frequency and distance of ions, showing excellent agreement with independent measurements. The method is shown to be effective for two-dimensional arrays of emitters, providing structural information where direct imaging techniques fail.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Sanchar Sharma, Victor A. S. V. Bittencourt, Alexy D. Karenowska, Silvia Viola Kusminskiy
Summary: Generating nonclassical states in macroscopic systems is a challenging task, and one approach involves using novel hybrid systems based on magnetic dielectrics. In this study, a proposal to generate a magnetization cat state using a conventional setup of a macroscopic ferromagnet in a microwave cavity is presented. The scheme involves utilizing the ground state of an ellipsoid shaped magnet and collapsing the magnetization to a cat state through either a single photon or a parity measurement of the microwave cavity state.
Article
Materials Science, Multidisciplinary
Ali A. Abu-Nada, Moataz A. Salhab
Summary: In an open quantum system, the noise induced by the environment is often assumed to be the reason for the disappearance of quantum properties. However, Barreiro et al. (2011) experimentally demonstrate that an engineered and controlled environment state can actually pump an arbitrary quantum system towards maximal entanglement, making it a resource for quantum information processing. To validate this idea, we simulate a quantum circuit on one of the IBM Q processors, aiming to pump an arbitrary maximally mixed state into a Greenberger-Horne-Zeilinger (GHZ) state. We propose a different circuit structure tailored for the IBM Q platform due to the limitations of the available circuits offered by Barreiro et al. (2011).
RESULTS IN PHYSICS
(2023)
Article
Quantum Science & Technology
Gary J. Mooney, Gregory A. L. White, Charles D. Hill, Lloyd C. L. Hollenberg
Summary: This study investigates the ability to prepare large-scale entangled quantum states on current superconducting quantum devices, with the application of quantum readout-error mitigation (QREM) to enhance observed entanglement levels. The results show full bipartite entanglement in two of the largest superconducting devices to date, indicating promising progress in generating entanglement in noisy intermediate-scale quantum (NISQ) devices.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Optics
Andrea Rodriguez-Blanco, K. Birgitta Whaley, Alejandro Bermudez
Summary: The idea of using maximally entangled states as a resource is crucial for various quantum information processing modalities, but the quality of these states as a resource can degrade due to imperfections during their preparation. We propose a low-overhead protocol to reverse this degradation by filtering out a specific type of noise relevant to many quantum technologies. We present two trapped-ion schemes to implement a nonunitary probabilistic filter against amplitude damping noise, thereby protecting maximally entangled pairs from spontaneous photon scattering during or after the entangling gates.
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
Physics, Multidisciplinary
Krzysztof Jachymski, Tomasz Wasak, Zbigniew Idziaszek, Paul S. Julienne, Antonio Negretti, Tommaso Calarco
PHYSICAL REVIEW LETTERS
(2018)
Editorial Material
Multidisciplinary Sciences
Jacob M. Taylor
Article
Physics, Multidisciplinary
Luigi Giannelli, Tom Schmit, Tommaso Calarco, Christiane P. Koch, Stephan Ritter, Giovanna Morigi
NEW JOURNAL OF PHYSICS
(2018)
Article
Multidisciplinary Sciences
Robert Heck, Oana Vuculescu, Jens Jakob Sorensen, Jonathan Zoller, Morten G. Andreasen, Mark G. Bason, Poul Ejlertsen, Otto Eliasson, Pinja Haikka, Jens S. Laustsen, Laerke L. Nielsen, Andrew Mao, Romain Mueller, Mario Napolitano, Mads K. Pedersen, Aske R. Thorsen, Carsten Bergenholtz, Tommaso Calarco, Simone Montangero, Jacob F. Sherson
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2018)
Review
Physics, Multidisciplinary
Michal Tomza, Krzysztof Jachymski, Rene Gerritsma, Antonio Negretti, Tommaso Calarco, Zbigniew Idziaszek, Paul S. Julienne
REVIEWS OF MODERN PHYSICS
(2019)
Article
Multidisciplinary Sciences
A. Omran, H. Levine, A. Keesling, G. Semeghini, T. T. Wang, S. Ebadi, H. Bernien, A. S. Zibrov, H. Pichler, S. Choi, J. Cui, M. Rossignolo, P. Rembold, S. Montangero, T. Calarco, M. Endres, M. Greiner, V. Vuletic, M. D. Lukin
Article
Biotechnology & Applied Microbiology
Fabrizio Angaroni, Alex Graudenzi, Marco Rossignolo, Davide Maspero, Tommaso Calarco, Rocco Piazza, Simone Montangero, Marco Antoniotti
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2020)
Article
Physics, Multidisciplinary
F. Borselli, M. Maiwoeger, T. Zhang, P. Haslinger, V Mukherjee, A. Negretti, S. Montangero, T. Calarco, I Mazets, M. Bonneau, J. Schmiedmayer
Summary: The experiment demonstrates a source of correlated atom pairs with opposite momenta and spatial modes forming a Bell state, characterized by strong number squeezing and genuine two-particle interference in the emitted atom beams.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Manolo R. Lam, Natalie Peter, Thorsten Groh, Wolfgang Alt, Carsten Robens, Dieter Meschede, Antonio Negretti, Simone Montangero, Tommaso Calarco, Andrea Alberti
Summary: This study demonstrates fast coherent transport of an atomic wave packet over a distance exceeding 15 times its size, going beyond the limitations of two-level systems. Measurements reveal the existence of a minimum duration for coherent splitting and recombination of matter waves, known as the quantum speed limit. By relying on a geometric interpretation of quantum state dynamics, physical insight into this limit is obtained.
Article
Quantum Science & Technology
Ivana Mastroserio, Stefano Gherardini, Cosimo Lovecchio, Tommaso Calarco, Simone Montangero, Francesco S. Cataliotti, Filippo Caruso
Summary: The researchers have successfully achieved time-reversal operations using the dressed chopped random basis optimal control algorithm. Their findings demonstrate that by designing optimal modulated radio frequency fields, high-precision time-reversal transformations can be achieved in a Bose-Einstein condensate composed of non-interacting atoms. These results are expected to significantly advance the implementation of time-reversal operations in gate-based quantum computing.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Quantum Science & Technology
Max Riedel, Matyas Kovacs, Peter Zoller, Juergen Mlynek, Tommaso Calarco
QUANTUM SCIENCE AND TECHNOLOGY
(2019)
Article
Art
Evelina Domnitch, Dmitry Gelfand, Tommaso Calarco
Correction
Optics
Michael H. Goerz, Giulia Gualdi, Daniel M. Reich, Christiane P. Koch, Felix Motzoi, K. Birgitta Whaley, Jiri Vala, Matthias M. Mueller, Simone Montangero, Tommaso Calarco
Article
Materials Science, Multidisciplinary
M. J. Gullans, J. M. Taylor, J. R. Petta
Article
Materials Science, Multidisciplinary
R. Cosmic, Hiroki Ikegami, Zhirong Lin, Kunihiro Inomata, Jacob M. Taylor, Yasunobu Nakamura
