Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Error-mitigated quantum simulation of interacting fermions with trapped ions
Wentao Chen, Shuaining Zhang, Jialiang Zhang +7 more·Feb 21, 2023
Quantum error mitigation has been extensively explored to increase the accuracy of the quantum circuits in noisy-intermediate-scale-quantum (NISQ) computation, where quantum error correction requiring additional quantum resources is not adopted. Amon...
Post-fabrication frequency trimming of coplanar-waveguide resonators in circuit QED quantum processors
S. Vallés-Sanclemente, S. L. M. van der Meer, M. Finkel +9 more·Feb 21, 2023
We present the use of a set of airbridges to trim the frequency of microwave coplanar-waveguide (CPW) resonators post-fabrication. This method is compatible with the fabrication steps of conventional CPW airbridges and crossovers and increases device...
Quench dynamics of the Schwinger model via variational quantum algorithms
Lento Nagano, A. Bapat, C. Bauer·Feb 21, 2023
We investigate the real-time dynamics of the $(1+1)$-dimensional U(1) gauge theory known as the Schwinger model via variational quantum algorithms. Specifically, we simulate quench dynamics in the presence of an external electric field. First, we use...
Coupler Microwave-Activated Controlled-Phase Gate on Fluxonium Qubits
I. A. Simakov, G. S. Mazhorin, I. N. Moskalenko +8 more·Feb 20, 2023
Tunable couplers have recently become one of the most powerful tools for implementing two-qubit gates between superconducting qubits. A tunable coupler typically includes a nonlinear element, such as a SQUID, which is used to tune the resonance frequ...
Cavity-enhanced single artificial atoms in silicon
V. Saggio, C. Errando-Herranz, S. Gyger +9 more·Feb 20, 2023
Artificial atoms in solids are leading candidates for quantum networks, scalable quantum computing, and sensing, as they combine long-lived spins with mobile photonic qubits. Recently, silicon has emerged as a promising host material where artificial...
All-Microwave Leakage Reduction Units for Quantum Error Correction with Superconducting Transmon Qubits.
J. Marques, H. Ali, B. Varbanov +9 more·Feb 20, 2023
Minimizing leakage from computational states is a challenge when using many-level systems like superconducting quantum circuits as qubits. We realize and extend the quantum-hardware-efficient, all-microwave leakage reduction unit (LRU) for transmons ...
A hybrid quantum-classical method for electron-phonon systems
M. Denner, Alexander Miessen, Haoran Yan +4 more·Feb 20, 2023
Quantum simulation of fermion-boson systems is significant in material applications, while limited by the unbounded boson states. By merging variational non-Gaussian transformations and variational quantum Eigensolvers, the authors design a hybrid qu...
Solving differential‐algebraic equations in power system dynamic analysis with quantum computing
Huynh T. T. Tran, Hieu T. Nguyen, L. T. Vu +1 more·Feb 19, 2023
Power system dynamics are generally modeled by high dimensional nonlinear differential‐algebraic equations (DAEs) given a large number of components forming the network. These DAEs' complexity can grow exponentially due to the increasing penetration ...
Quantum-Relaxation Based Optimization Algorithms: Theoretical Extensions
Kosei Teramoto, Rudy Raymond, Eyuri Wakakuwa +1 more·Feb 19, 2023
Quantum Random Access Optimizer (QRAO) is a quantum-relaxation based optimization algorithm proposed by Fuller et al. that utilizes Quantum Random Access Code (QRAC) to encode multiple variables of binary optimization in a single qubit. The approxima...
Quantum Gate Generation in Two-Level Open Quantum Systems by Coherent and Incoherent Photons Found with Gradient Search
V. Petruhanov, A. Pechen·Feb 18, 2023
In this work, we consider an environment formed by incoherent photons as a resource for controlling open quantum systems via an incoherent control. We exploit a coherent control in the Hamiltonian and an incoherent control in the dissipator which ind...
Signatures of non-Markovianity of a superconducting qubit
Bal'azs Gul'acsi, G. Burkard·Feb 17, 2023
We describe temporally correlated noise processes that influence the idle evolution of a superconducting transmon qubit. To model the composite qubit-environment system we use quantum circuit theory, and we show how a circuit Hamiltonian can be deriv...
A Herculean task: classical simulation of quantum computers.
Xiaosi Xu, S. Benjamin, Jinzhao Sun +2 more·Feb 17, 2023
In the effort to develop useful quantum computers, simulating quantum machines with conventional classical computing resources is a key capability. Such simulations will always face limits, preventing the emulation of quantum computers at substantial...
Observation of Josephson harmonics in tunnel junctions
D. Willsch, D. Rieger, P. Winkel +27 more·Feb 17, 2023
Approaches to developing large-scale superconducting quantum processors must cope with the numerous microscopic degrees of freedom that are ubiquitous in solid-state devices. State-of-the-art superconducting qubits employ aluminium oxide (AlOx) tunne...
Quantum work statistics at strong reservoir coupling
Owen Diba, Harry J. D. Miller, Jake Iles-Smith +1 more·Feb 16, 2023
Determining the statistics of work done on a quantum system while strongly coupled to a reservoir is a formidable task, requiring the calculation of the full eigenspectrum of the combined system and reservoir. Here we show that this issue can be circ...
Verification of Nondeterministic Quantum Programs
Yuan Feng, Ying Xu·Feb 15, 2023
Nondeterministic choice is a useful program construct that provides a way to describe the behaviour of a program without specifying the details of possible implementations. It supports the stepwise refinement of programs, a method that has proven use...
A quantum computing implementation of nuclearelectronic orbital (NEO) theory: Toward an exact pre-Born-Oppenheimer formulation of molecular quantum systems.
Arseny Kovyrshin, Mårten Skogh, A. Broo +4 more·Feb 15, 2023
Nuclear quantum phenomena beyond the Born-Oppenheimer approximation are known to play an important role in a growing number of chemical and biological processes. While there exists no unique consensus on a rigorous and efficient implementation of cou...
Splitting phonons: Building a platform for linear mechanical quantum computing
Hong Qiao, É. Dumur, Gustav Andersson +9 more·Feb 15, 2023
Linear optical quantum computing provides a desirable approach to quantum computing, with only a short list of required computational elements. The similarity between photons and phonons points to the interesting potential for linear mechanical quant...
Quantum Control of Rydberg Atoms for Mesoscopic Quantum State and Circuit Preparation
Valerio Crescimanna, Jacob M. Taylor, A. Goldberg +1 more·Feb 15, 2023
Individually trapped Rydberg atoms show significant promise as a platform for scalable quantum simulation and for development of programmable quantum computers. In particular, the Rydberg blockade effect can be used to facilitate both fast qubit-qubi...
Quantum simulation of battery materials using ionic pseudopotentials
Modjtaba Shokrian Zini, A. Delgado, R. D. Reis +4 more·Feb 15, 2023
Ionic pseudopotentials are widely used in classical simulations of materials to model the effective potential due to the nucleus and the core electrons. Modeling fewer electrons explicitly results in a reduction in the number of plane waves needed to...
Discovery of atomic clock-like spin defects in simple oxides from first principles
J. Davidsson, M. Onizhuk, C. Vorwerk +1 more·Feb 15, 2023
Virtually noiseless due to the scarcity of spinful nuclei in the lattice, simple oxides hold promise as hosts of solid-state spin qubits. However, no suitable spin defect has yet been found in these systems. Using high-throughput first-principles cal...