Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Digital-Analog Co-Design of the Harrow-Hassidim-Lloyd Algorithm
Ana Martin, Rubén Ibarrondo, M. Sanz·Jul 27, 2022
The Harrow-Hassidim-Lloyd quantum algorithm was proposed to solve linear systems of equations $A\vec{x} = \vec{b}$ and it is the core of various applications. However, there is not an explicit quantum circuit for the subroutine which maps the inverse...
Realizing a class of stabilizer quantum error correction codes using a single ancilla and circular connectivity
A. V. Antipov, E. Kiktenko, A. Fedorov·Jul 27, 2022
We describe a class of"neighboring-blocks"stabilizer quantum error correction codes and demonstrate that such class of codes can be implemented in a resource-efficient manner using a single ancilla and circular near-neighbor qubit connectivity. We pr...
Quantum simulation of quantum phase transitions using the convex geometry of reduced density matrices
Samuel Warren, LeeAnn M. Sager-Smith, D. Mazziotti·Jul 26, 2022
Transitions of many-particle quantum systems between distinct phases at absolute-zero temperature, known as quantum phase transitions, require an exacting treatment of particle correlations. In this work, we present a general quantum-computing approa...
Verifying Fairness in Quantum Machine Learning
J. Guan, Wang Fang, M. Ying·Jul 22, 2022
Due to the beyond-classical capability of quantum computing, quantum machine learning is applied independently or embedded in classical models for decision making, especially in the field of finance. Fairness and other ethical issues are often one of...
Well-conditioned multi-product formulas for hardware-friendly Hamiltonian simulation
Almudena Carrera Vazquez, D. Egger, David Ochsner +1 more·Jul 22, 2022
Simulating the time-evolution of a Hamiltonian is one of the most promising applications of quantum computers. Multi-Product Formulas (MPFs) are well suited to replace standard product formulas since they scale better with respect to time and approxi...
Quantum Machine Learning for Distributed Quantum Protocols with Local Operations and Noisy Classical Communications
Hari Hara Suthan Chittoor, O. Simeone·Jul 22, 2022
Distributed quantum information processing protocols such as quantum entanglement distillation and quantum state discrimination rely on local operations and classical communications (LOCC). Existing LOCC-based protocols typically assume the availabil...
Machine Learning assisted excess noise suppression for continuous-variable quantum key distribution
Kexin Liang, Geng Chai, Zhengwen Cao +3 more·Jul 21, 2022
Excess noise is a major obstacle to high-performance continuous-variable quantum key distribution (CVQKD), which is mainly derived from the amplitude attenuation and phase fluctuation of quantum signals caused by channel instability. Here, an excess n...
Requirements for a processing-node quantum repeater on a real-world fiber grid
G. Avis, Francisco Ferreira da Silva, T. Coopmans +6 more·Jul 21, 2022
We numerically study the distribution of entanglement between the Dutch cities of Delft and Eindhoven realized with a processing-node quantum repeater and determine minimal hardware requirements for verifiable blind quantum computation using color ce...
Ability of error correlations to improve the performance of variational quantum algorithms
Joris Kattemölle, G. Burkard·Jul 21, 2022
The quantum approximate optimization algorithm (QAOA) has the potential of providing a useful quantum advantage on noisy intermediate-scale quantum (NISQ) devices. The effects of uncorrelated noise on variational quantum algorithms such as QAOA have ...
Limits to Quantum Gate Fidelity from Near-Field Thermal and Vacuum Fluctuations
Wenbo Sun, S. Bharadwaj, Li‐Ping Yang +5 more·Jul 19, 2022
High-fidelity quantum gate operations are essential for achieving scalable quantum circuits. In spin qubit quantum computing systems, metallic gates and antennas which are necessary for qubit operation, initialization, and readout, also cause detrime...
Benchmarking quantum logic operations relative to thresholds for fault tolerance
A. Hashim, Stefan K. Seritan, T. Proctor +6 more·Jul 18, 2022
Contemporary methods for benchmarking noisy quantum processors typically measure average error rates or process infidelities. However, thresholds for fault-tolerant quantum error correction are given in terms of worst-case error rates—defined via the...
Calibration-Aware Transpilation for Variational Quantum Optimization
Yanjun Ji, Sebastian Brandhofer, I. Polian·Jul 17, 2022
Today’s Noisy Intermediate-Scale Quantum (NISQ) computers support only limited sets of available quantum gates and restricted connectivity. Therefore, quantum algorithms must be transpiled in order to become executable on a given NISQ computer; trans...
Statistically characterizing robustness and fidelity of quantum controls and quantum control algorithms
Irtaza Khalid, C. Weidner, E. Jonckheere +2 more·Jul 16, 2022
Robustness of quantum operations or controls is important to build reliable quantum devices. The robustness-infidelity measure (RIM$_p$) is introduced to statistically quantify the robustness and fidelity of a controller as the p-order Wasserstein di...
Quantum Noise-Induced Reservoir Computing
T. Kubota, Yudai Suzuki, Shumpei Kobayashi +3 more·Jul 16, 2022
Quantum computing has been moving from a theoretical phase to practical one, presenting daunting challenges in implementing physical qubits, which are subjected to noises from the surrounding environment. These quantum noises are ubiquitous in quantu...
Q-BEEP: Quantum Bayesian Error Mitigation Employing Poisson Modeling over the Hamming Spectrum
S. Stein, N. Wiebe, Yufei Ding +2 more·Jul 14, 2022
Quantum computing technology has grown rapidly in recent years, with new technologies being explored, error rates being reduced, and quantum processors' qubit capacity growing. However, near-term quantum algorithms are still unable to be induced with...
Conservation Laws and Quantum Error Correction: Toward a Generalized Matching Decoder
Benjamin J. Brown·Jul 13, 2022
Decoding algorithms are essential to fault-tolerant quantum-computing architectures. In this perspective we explore decoding algorithms for the surface code; a prototypical quantum low-density parity-check code that underlies many of the leading effo...
Quantum computing fidelity susceptibility using automatic differentiation
Olivia Di Matteo, R. Woloshyn·Jul 13, 2022
Automatic differentiation is an invaluable feature of machine learning and quantum machine learning software libraries. In this work it is shown how quantum automatic differentiation can be used to solve the condensed-matter problem of computing fide...
A Synergistic Compilation Workflow for Tackling Crosstalk in Quantum Machines
Fei Hua, Yuwei Jin, A. Li +5 more·Jul 12, 2022
Near-term quantum systems tend to be noisy. Crosstalk noise has been recognized as one of several major types of noises in superconducting Noisy Intermediate-Scale Quantum (NISQ) devices. Crosstalk arises from the concurrent execution of two-qubit ga...
Belief Propagation with Quantum Messages for Symmetric Classical-Quantum Channels
S. Brandsen, Avijit Mandal, H. Pfister·Jul 11, 2022
Belief propagation (BP) is a classical algorithm that approximates the marginal distribution associated with a factor graph by passing messages between adjacent nodes in the graph. It gained popularity in the 1990’s as a powerful decoding algorithm f...
Computing electronic correlation energies using linear depth quantum circuits
Chong Hian Chee, A. Mak, D. Leykam +2 more·Jul 8, 2022
Efficient computation of molecular energies is an exciting application of quantum computing for quantum chemistry, but current noisy intermediate-scale quantum (NISQ) devices can only execute shallow circuits, limiting existing variational quantum al...