Article
Physics, Multidisciplinary
Fei-Yu Wang, Jin-Cheng Lu, Zi Wang, Li-Wei Duan, Chen Wang, Jie Ren
Summary: This study investigates the steady-state heat flow in a two-mode qubit-resonator model, revealing that tuning the strength of resonator-resonator interaction can suppress or enhance the heat current. It also demonstrates negative differential thermal conductance and significant thermal rectification at weak qubit-resonator coupling.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
P. Scarlino, J. H. Ungerer, D. J. van Woerkom, M. Mancini, P. Stano, C. Mueller, A. J. Landig, J. Koski, C. Reichl, W. Wegscheider, T. Ihn, K. Ensslin, A. Wallraff
Summary: This study investigates the use of semiconductor quantum dots, where electrons or holes are isolated via electrostatic potentials generated by surface gates, in semiconductor quantum technology. By capacitively coupling double-quantum-dot (DQD) charge qubits to high-impedance superconducting quantum interference device array and Josephson-junction array resonators, the researchers were able to tune the interactions between the qubit and the resonator using surface gates. The results show that the qubit-resonator coupling strength, qubit decoherence, and detuning noise affecting the charge qubit are all systematically tunable.
Article
Multidisciplinary Sciences
Shuai-Peng Wang, Alessandro Ridolfo, Tiefu Li, Salvatore Savasta, Franco Nori, Y. Nakamura, J. Q. You
Summary: Hybrid quantum systems in the ultrastrong and deep-strong coupling regimes exhibit exotic physical phenomena and have potential applications in quantum technologies. In these nonperturbative regimes, a qubit-resonator system has an entangled quantum vacuum with virtual photons that cannot be directly detected. However, the vacuum field can induce symmetry breaking of a dispersively coupled probe qubit. Wang et al. experimentally observe parity symmetry breaking in a probe qubit coupled to a deep-strongly coupled resonator, providing a way to explore novel quantum-vacuum effects.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Rui-Chang Shen, Jie Li, Zhi-Yuan Fan, Yi-Pu Wang, J. Q. You
Summary: Bistable mechanical vibration is observed in a cavity magnomechanical system, which combines microwave cavity mode, magnon mode, and mechanical vibration mode. This system exhibits changes in mechanical frequency and linewidth under a strong microwave drive field due to the activation of three different nonlinearities simultaneously. Among them, the magnon-phonon cross-Kerr nonlinearity is predicted and measured for the first time in magnomechanics. The study also shows the strong influence of Kerr-type nonlinearities on traditional cavity magnomechanics and provides a unique platform for studying various nonlinear effects in a single experiment.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Tanmoy Bera, Sourav Majumder, Sudhir Kumar Sahu, Vibhor Singh
Summary: Researchers have demonstrated a hybrid device incorporating a superconducting transmon qubit and a mechanical resonator coupled using magnetic-flux. They showed a high vacuum electromechanical coupling rate and the enhancement of electromechanical coupling by tuning the qubit position, while observing specific interference features.
COMMUNICATIONS PHYSICS
(2021)
Article
Quantum Science & Technology
Nicola Mariella, Sergiy Zhuk
Summary: Swap mapping is a quantum compiler optimization that uses SWAP gates to map a logical quantum circuit to a physically implementable one. The placement of SWAP gates is a discrete optimization process that ensures hardware connectivity constraints are met.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Physics, Multidisciplinary
Emely Wiegand, Ping-Yi Wen, Per Delsing, Io-Chun Hoi, Anton Frisk Kockum
Summary: In this study, three types of amplification processes for light fields coupling to an atom near the end of a one-dimensional semi-infinite waveguide were investigated. The end of the waveguide acts as a mirror for the light, enhancing amplification in two ways: directing all output in one direction and enabling interference for tuning relaxation rates to increase population inversion. The quantified enhancement in amplification due to these factors can be demonstrated for standard parameters in experiments with superconducting quantum circuits.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Wei Xiong, Jiaojiao Chen, Baolong Fang, Mingfeng Wang, Liu Ye, J. Q. You
Summary: In this study, a method to greatly enhance the interaction between two single NV spins in diamond is proposed. By optimizing the interaction between NV spin and the electromechanical cavity, a strong coupling between the spins is achieved, enabling coherent quantum-information exchange.
Article
Optics
Qin Li, Chengdong Liu, Yu Peng, Fang Yu, Cai Zhang
Summary: Blind quantum computation (BQC) allows users with limited quantum abilities to complete tasks with the aid of a remote quantum server while keeping their information hidden. This paper introduces a new BQC model where users only need to implement single-qubit gates. A specific protocol is proposed to demonstrate the feasibility of this model and answer the question of whether a verified BQC protocol using only single-qubit gates can be designed.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Ya-long Ren, Sheng-li Ma, Fu-li Li
Summary: In this study, a method to achieve chiral interaction between the magnon mode in a ferromagnetic sphere and a superconducting qubit via quantum interference effect in a one-dimensional coupled-cavity array is proposed, providing a new approach for constructing chiral devices.
Article
Engineering, Electrical & Electronic
Yu Fu, Xiao Tian, He Gaoqian, Liao Qinghong
Summary: A scheme based on the interaction of photon-superconducting qubit-phonon three-body hybrid quantum system is proposed, and its probe absorption properties are analyzed in detail. The results show that this scheme can accurately measure the coupling strength and vibration frequency, which is of great significance to the fields of precision measurement, quantum computing, and quantum information processing.
LASER & OPTOELECTRONICS PROGRESS
(2022)
Article
Optics
C. Vega, M. Bello, D. Porras, A. Gonzalez-Tudela
Summary: This paper investigates the interaction between quantum emitters and different topological photonic models, revealing the characteristics of qubit-photon bound states and their connection to topological invariants. By utilizing giant atoms for nonlocal couplings, the shape of these qubit-photon bound states can be further adjusted. Additionally, it is demonstrated that giant-atom dynamics can distinguish between different topological phases, providing insights into the interplay between topological photonics and quantum optics.
Article
Physics, Multidisciplinary
Jiu-Ming Li, Shao-Ming Fei
Summary: We propose protocols for generating quantum entanglement on nonlocal magnons in hybrid systems consisting of yttrium iron garnet (YIG) spheres, microwave cavities, and a superconducting qubit. By exchanging virtual photons, the cavities can indirectly interact in the far-detuning regime. Detailed protocols are presented for establishing entanglement between two, three, and arbitrary N magnons with reasonable fidelities.
FRONTIERS OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
F. Pistolesi, A. N. Cleland, A. Bachtold
Summary: Mechanical oscillators with high quality factors and coupling to various fields can be ideal sensors. Coupling a flexural mode of a suspended carbon nanotube to charge states of a double quantum dot can induce anharmonicity for a mechanical quantum bit, but requires ultrastrong coupling regime. The system shows potential for reduced dephasing and applications in quantum computation and sensing.
Article
Quantum Science & Technology
Si-Si Gu, Bao-Chuan Wang, Ming-Bo Chen, Ting Lin, Yuan Kang, Hai-Ou Li, Gang Cao, Guo-Ping Guo
Summary: The integration of quantum dots with a microwave resonator in the hybrid circuit quantum electrodynamics architecture has created a controllable artificial system and enriched physics through electron-photon interaction. The study investigates a hybrid device where a triple quantum dot is dipole coupled with the electric field of a superconducting quantum interference device array resonator. The results suggest that the hybrid system has the potential to investigate exotic many-body effects and matter-light interaction, depending on the relationship between various Coulomb energy in the quantum dot and the cavity photon energy.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Mathematics, Applied
George Fikioris, Themistoklis K. Mavrogordatos
LINEAR ALGEBRA AND ITS APPLICATIONS
(2019)
Article
Physics, Applied
A. D. Patterson, J. Rahamim, T. Tsunoda, P. A. Spring, S. Jebari, K. Ratter, M. Mergenthaler, G. Tancredi, B. Vlastakis, M. Esposito, P. J. Leek
PHYSICAL REVIEW APPLIED
(2019)
Article
Physics, Applied
Gaurav Bhole, Takahiro Tsunoda, Peter J. Leek, Jonathan A. Jones
PHYSICAL REVIEW APPLIED
(2020)
Article
Physics, Applied
P. A. Spring, T. Tsunoda, B. Vlastakis, P. J. Leek
PHYSICAL REVIEW APPLIED
(2020)
Article
Physics, Applied
Andreas Bengtsson, Pontus Vikstal, Christopher Warren, Marika Svensson, Xiu Gu, Anton Frisk Kockum, Philip Krantz, Christian Krizan, Daryoush Shiri, Ida-Maria Svensson, Giovanna Tancredi, Goran Johansson, Per Delsing, Giulia Ferrini, Jonas Bylander
PHYSICAL REVIEW APPLIED
(2020)
Article
Multidisciplinary Sciences
Paul Brookes, Giovanna Tancredi, Andrew D. Patterson, Joseph Rahamim, Martina Esposito, Themistoklis K. Mavrogordatos, Peter J. Leek, Eran Ginossar, Marzena H. Szymanska
Summary: This study explores the rich quantum activation dynamics and critical slowing down in an engineered superconducting quantum circuit, specifically in the intermediate bistable regime of the generalized Jaynes-Cummings Hamiltonian. A previously unidentified regime of quantum activation with saturation of critical slowing down is found, shedding light on the fundamental role played by the qubit in this regime through comparison with experimental results and various models.
Article
Physics, Applied
J. Wills, G. Campanaro, S. Cao, S. D. Fasciati, P. J. Leek, B. Vlastakis
Summary: Understanding and suppressing decoherence is crucial for building practical quantum computers. This study focuses on low-frequency charge noise, a commonly known decoherence mechanism in superconducting qubits, and explores its behavior in multimode qubits. The results show that the charge sensitivity in these qubits can be characterized and tracked using Ramsey interferometry, providing valuable insights for understanding and controlling decoherence.
PHYSICAL REVIEW APPLIED
(2022)
Article
Quantum Science & Technology
Sandoko Kosen, Hang-Xi Li, Marcus Rommel, Daryoush Shiri, Christopher Warren, Leif Gronberg, Jaakko Salonen, Tahereh Abad, Janka Biznarova, Marco Caputo, Liangyu Chen, Kestutis Grigoras, Goran Johansson, Anton Frisk Kockum, Christian Krizan, Daniel Perez Lozano, Graham J. Norris, Amr Osman, Jorge Fernandez-Pendas, Alberto Ronzani, Anita Fadavi Roudsari, Slawomir Simbierowicz, Giovanna Tancredi, Andreas Wollraff, Christopher Eichler, Joonas Govenius, Jonas Bylander
Summary: This paper investigates the integration of single and coupled superconducting transmon qubits into flip-chip modules and presents high coherence times and gate fidelities. This integration technique can be used to realize quantum processors with hundreds of qubits.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Instruments & Instrumentation
Mats O. Tholen, Riccardo Borgani, Giuseppe Ruggero Di Carlo, Andreas Bengtsson, Christian Krizan, Marina Kudra, Giovanna Tancredi, Jonas Bylander, Per Delsing, Simone Gasparinetti, David B. Haviland
Summary: This paper introduces a digital microwave platform called Presto, which is designed for measuring and controlling multiple quantum bits. Presto utilizes direct digital synthesis to create signals and analyze responses on its ports. It has various features, including digital triggers, continuous-wave outputs, and DC-bias outputs. The scalability of Presto allows for experiments with a large number of qubits. The authors also demonstrate the capabilities of Presto in experiments involving two superconducting qubits.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Quantum Science & Technology
Xiu Gu, Jorge Fernandez-Pendas, Pontus Vikstal, Tahereh Abad, Christopher Warren, Andreas Bengtsson, Giovanna Tancredi, Vitaly Shumeiko, Jonas Bylander, Goran Johansson, Anton Frisk Kockum
Summary: Near-term quantum computers are restricted to running low-depth quantum circuits due to the decoherence of qubits, limiting the types of quantum algorithms that can be implemented. By expanding the gate set to include multiqubit gates, it is possible to overcome these limitations and achieve gate fidelities above 99% in current quantum-computing platforms. Additionally, using simultaneous two-qubit gates allows for the swift creation of large entangled states like Dicke and Greenberger-Horne-Zeilinger states.
Article
Optics
Takahiro Tsunoda, Gaurav Bhole, Stephen A. Jones, Jonathan A. Jones, Peter J. Leek
Article
Optics
Th K. Mavrogordatos
Article
Materials Science, Multidisciplinary
C. Lledo, Th K. Mavrogordatos, M. H. Szymanska
Proceedings Paper
Quantum Science & Technology
Martina Esposito, Joseph Rahamim, Andrew Patterson, Matthias Mergenthaler, James Wills, Giulio Campanaro, Takahiro Tsunoda, Peter Spring, Sophia Sosnina, Salha Jebari, Kitty Ratter, Giovanna Tancredi, Brian Vlastakis, Peter Leek
QUANTUM TECHNOLOGY INTERNATIONAL CONFERENCE 2018 (QTECH 2018)
(2019)
