Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum state preparation of normal distributions using matrix product states
J. Iaconis, S. Johri, E. Zhu·Mar 2, 2023
State preparation is a necessary component of many quantum algorithms. In this work, we combine a method for efficiently representing smooth differentiable probability distributions using matrix product states with recently discovered techniques for ...
Real-time hybrid quantum-classical computations for trapped ions with Python control-flow
Tobias Schmale, Bence Temesi, Niko Trittschanke +7 more·Mar 2, 2023
In recent years, the number of hybrid algorithms that combine quantum and classical computations has been continuously increasing. These two approaches to computing can mutually enhance each others’ performances thus bringing the promise of more adva...
Coordination of Multiple Robots along Given Paths with Bounded Junction Complexity
Mikkel Abrahamsen, Tzvika Geft, D. Halperin +1 more·Mar 1, 2023
We study a fundamental NP-hard motion coordination problem for multi-robot/multi-agent systems: We are given a graph G and set of agents, where each agent has a given directed path in G. Each agent is initially located on the first vertex of its path...
Fast and reliable entanglement distribution with quantum repeaters: Principles for improving protocols using reinforcement learning
Stav Haldar, Pratik J. Barge, Sumeet Khatri +1 more·Mar 1, 2023
Future quantum technologies such as quantum communication, quantum sensing, and distributed quantum computation, will rely on networks of shared entanglement between spatially separated nodes. In this work, we provide improved protocols/policies for ...
Verifiably exact solution of the electronic Schrödinger equation on quantum devices
Scott E. Smart, D. Mazziotti·Mar 1, 2023
Quantum computers have the potential for an exponential speedup of classical molecular computations. However, existing algorithms have limitations; quantum phase estimation (QPE) algorithms are intractable on current hardware while variational quantu...
Robustness of quantum algorithms against coherent control errors
J. Berberich, D. Fink, C. Holm·Mar 1, 2023
Coherent control errors, for which ideal Hamiltonians are perturbed by unknown multiplicative noise terms, are a major obstacle for reliable quantum computing. In this paper, we present a framework for analyzing the robustness of quantum algorithms a...
Hardware Implementation of Quantum Stabilizers in Superconducting Circuits.
K. Dodge, Y. Liu, A. Klots +7 more·Mar 1, 2023
Stabilizer operations are at the heart of quantum error correction and are typically implemented in software-controlled entangling gates and measurements of groups of qubits. Alternatively, qubits can be designed so that the Hamiltonian corresponds d...
Circuit implementation of discrete-time quantum walks via the shunt decomposition method
Allan Wing-Bocanegra, S. Venegas-Andraca·Mar 1, 2023
Several models have been proposed to build evolution operators to perform quantum walks in a theoretical way, although when wanting to map the resulting evolution operators into quantum circuits to run them in quantum computers, it is often the case ...
Learning Correlated Noise in a 39-Qubit Quantum Processor
R. Harper, S. Flammia·Mar 1, 2023
Building error-corrected quantum computers relies crucially on measuring and modeling noise on candidate devices. In particular, optimal error correction requires knowing the noise that occurs in the device as it executes the circuits required for er...
Designing High-Fidelity Zeno Gates for Dissipative Cat Qubits
R. Gautier, M. Mirrahimi, A. Sarlette·Mar 1, 2023
Bosonic cat qubits stabilized with a driven two-photon dissipation are systems with exponentially biased noise, opening the door to low-overhead, fault-tolerant and universal quantum computing. However, current gate proposals for such qubits induce s...
Many-Body Majorana Braiding without an Exponential Hilbert Space.
Eric Mascot, Themba Hodge, Daniel Crawford +3 more·Mar 1, 2023
Qubits built out of Majorana zero modes constitute the primary path toward topologically protected quantum computing. Simulating the braiding process of multiple Majorana zero modes corresponds to the quantum dynamics of a superconducting many-body s...
Mean-Field Approximate Optimization Algorithm
Aditi Misra-Spieldenner, T. Bode, Peter K. Schuhmacher +3 more·Mar 1, 2023
The Quantum Approximate Optimization Algorithm (QAOA) is suggested as a promising application on early quantum computers. Here, a quantum-inspired classical algorithm, the mean-field Approximate Optimization Algorithm (mean-field AOA), is developed b...
MAQA: a quantum framework for supervised learning
A. Macaluso, M. Klusch, Stefano Lodi +1 more·Mar 1, 2023
Quantum machine learning has the potential to improve traditional machine learning methods and overcome some of the main limitations imposed by the classical computing paradigm. However, the practical advantages of using quantum resources to solve pa...
Engineering phonon-phonon interactions in multimode circuit quantum acousto-dynamics
Uwe von Lupke, I. C. Rodrigues, Yu Yang +2 more·Mar 1, 2023
In recent years, remarkable progress has been made towards encoding and processing quantum information in the large Hilbert space of bosonic modes. Mechanical resonators are of great interest for this purpose, since they confine many high quality fac...
Real-time decoding for fault-tolerant quantum computing: progress, challenges and outlook
F. Battistel, C. Chamberland, Kauser Johar +5 more·Feb 28, 2023
Quantum computing is poised to solve practically useful problems which are computationally intractable for classical supercomputers. However, the current generation of quantum computers are limited by errors that may only partially be mitigated by de...
A CS guide to the quantum singular value transformation
Ewin Tang, Kevin T. Tian·Feb 28, 2023
We present a simplified exposition of some pieces of [Gily\'en, Su, Low, and Wiebe, STOC'19, arXiv:1806.01838], which introduced a quantum singular value transformation (QSVT) framework for applying polynomial functions to block-encoded matrices. The...
Repeated Purification versus Concatenated Error Correction in Fault Tolerant Quantum Networks
M. Barbeau, Joaquín García, E. Kranakis·Feb 27, 2023
Entanglement distribution is a core mechanism for the future quantum Internet. The quantum world is, however, a faulty environment. Hence, successful entanglement swapping is error-prone. The occurrence of quantum state errors can be mitigated using ...
Impact of decoherence on the fidelity of quantum gates leaving the computational subspace
Tahereh Abad, Y. Schattner, A. F. Kockum +1 more·Feb 27, 2023
The fidelity of quantum operations is often limited by incoherent errors, which typically can be modeled by fundamental Markovian noise processes such as amplitude damping and dephasing. In Phys. Rev. Lett. 129, 150504 (2022), we presented an analyti...
Variational quantum eigensolvers in the era of distributed quantum computers
Ilia Khait, Edwin Tham, D. Segal +1 more·Feb 27, 2023
The computational power of a quantum computer is limited by the number of qubits available for information processing. Increasing this number within a single device is difficult; it is widely accepted that distributed modular architectures are the so...
A Theory of Direct Randomized Benchmarking
Anthony M. Polloreno, Arnaud Carignan-Dugas, Jordan Hines +3 more·Feb 27, 2023
Randomized benchmarking (RB) protocols are widely used to measure an average error rate for a set of quantum logic gates. However, the standard version of RB is limited because it only benchmarks a processor's native gates indirectly, by using them i...