Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Topological phase transition in a narrow bandgap semiconductor nanolayer
Zhi-Hai Liu, W. Lou, Kai Chang +1 more·Oct 26, 2023
Narrow bandgap semiconductor nanostructures have been explored for realization of topological superconducting quantum devices in which Majorana states can be created and employed for constructing topological qubits. However, a prerequisite to achieve...
Stealthy SWAPs: Adversarial SWAP Injection in Multi-Tenant Quantum Computing
S. Upadhyay, Swaroop Ghosh·Oct 26, 2023
Quantum computing (QC) holds tremendous promise in revolutionizing problem-solving across various domains. It has been suggested in literature that 50+ qubits are sufficient to achieve quantum advantage (i.e., to surpass supercomputers in solving cer...
Deep quantum circuit simulations of low-energy nuclear states
Ang Li, Alessandro Baroni, I. Stetcu +1 more·Oct 26, 2023
Numerical simulation is an important method for verifying the quantum circuits used to simulate low-energy nuclear states. However, real-world applications of quantum computing for nuclear theory often generate deep quantum circuits that place demand...
Tightening Continuity Bounds for Entropies and Bounds on Quantum Capacities
M. Jabbour, Nilanjana Datta·Oct 26, 2023
Uniform continuity bounds on entropies are generally expressed in terms of a single distance measure between probability distributions or quantum states, typically, the total variation- or trace distance. However, if an additional distance measure is...
Unifying (Quantum) Statistical and Parametrized (Quantum) Algorithms
A. Nietner·Oct 26, 2023
Kearns' statistical query (SQ) oracle (STOC'93) lends a unifying perspective for most classical machine learning algorithms. This ceases to be true in quantum learning, where many settings do not admit, neither an SQ analog nor a quantum statistical ...
Broadband coplanar-waveguide-based impedance-transformed Josephson parametric amplifier
Bingcheng Qing, Long B. Nguyen, Xinyu Liu +9 more·Oct 26, 2023
Quantum-limited Josephson parametric amplifiers play a pivotal role in advancing the field of circuit quantum electrodynamics by enabling the fast and high-fidelity measurement of weak microwave signals. Therefore, it is necessary to develop robust p...
Cavity-mediated iSWAP oscillations between distant spins
J. Dijkema, X. Xue, P. Harvey-Collard +6 more·Oct 25, 2023
Direct interactions between quantum particles naturally fall off with distance. However, future quantum computing architectures are likely to require interaction mechanisms between qubits across a range of length scales. In this work, we demonstrate ...
Non-Clifford and parallelizable fault-tolerant logical gates on constant and almost-constant rate homological quantum LDPC codes via higher symmetries
Guanyu Zhu, Shehryar Sikander, Elia Portnoy +2 more·Oct 25, 2023
We study parallel fault-tolerant quantum computing for families of homological quantum low-density parity-check (LDPC) codes defined on 3-manifolds with constant or almost-constant encoding rate. We derive generic formula for a transversal $T$ gate o...
Structure of CSS and CSS-T quantum codes
Elena Berardini, A. Caminata, A. Ravagnani·Oct 25, 2023
We investigate CSS and CSS-T quantum error-correcting codes from the point of view of their existence, rarity, and performance. We give a lower bound on the number of pairs of linear codes that give rise to a CSS code with good correction capability,...
All-optical superconducting qubit readout
G. Arnold, Thomas Werner, R. Sahu +3 more·Oct 25, 2023
The rapid development of superconducting quantum hardware is expected to run into substantial restrictions on scalability because error correction in a cryogenic environment has stringent input–output requirements. Classical data centres rely on fibr...
2D High-Temperature Superconductor Integration in Contact Printed Circuit Boards
C. N. Saggau, Sanaz Shokri, Mickey Martini +9 more·Oct 25, 2023
Inherent properties of superconducting Bi2Sr2CaCu2O8+x films, such as the high superconducting transition temperature Tc, efficient Josephson coupling between neighboring CuO layers, and fast quasiparticle relaxation dynamics, make them a promising p...
Quantum Parametric Amplification and NonClassical Correlations due to 45 nm nMOS Circuitry Effect
A. Salmanogli, A. Bermak·Oct 25, 2023
This study unveils a groundbreaking exploration of using semiconductor technology in quantum circuitry. Leveraging the unique operability of 45 nm CMOS technology at deep cryogenic temperatures (~ 300 mK), a novel quantum electronic circuit is meticu...
From Heisenberg to Hubbard: An initial state for the shallow quantum simulation of correlated electrons
Bruno Murta, J. Fern'andez-Rossier·Oct 25, 2023
The widespread use of the noninteracting ground state as the initial state for the digital quantum simulation of the Fermi-Hubbard model is largely due to the scarcity of alternative easy-to-prepare approximations to the exact ground state in the lit...
Robust shaped pulses for arrays of superconducting or semiconductor spin qubits with fixed Ising coupling
David W. Kanaar, J. Kestner·Oct 24, 2023
A major current challenge in solid-state quantum computing is to scale qubit arrays to a larger number of qubits. This is hampered by the complexity of the control wiring for the large number of independently tunable interqubit couplings within these...
The Physics of (good) LDPC Codes I. Gauging and dualities
Tibor Rakovszky, V. Khemani·Oct 24, 2023
Low-depth parity check (LDPC) codes are a paradigm of error correction that allow for spatially non-local interactions between (qu)bits, while still enforcing that each (qu)bit interacts only with finitely many others. On expander graphs, they can gi...
The Quantum Tortoise and the Classical Hare: A simple framework for understanding which problems quantum computing will accelerate (and which it will not)
Sukwoong Choi, William S. Moses, Neil Thompson·Oct 24, 2023
Quantum computing promises transformational gains for solving some problems, but little to none for others. For anyone hoping to use quantum computers now or in the future, it is important to know which problems will benefit. In this paper, we introd...
A Near-Quadratic Sample Complexity Reduction for Agnostic Learning via Quantum Algorithms
Daniel Z. Zanger·Oct 24, 2023
Using quantum algorithms, we obtain, for accuracy $\epsilon,0<\epsilon<1/4$ and confidence $1-\delta,0<\delta<1,$ a new sample complexity upper bound of $O((\mbox{log}(\frac{1}{\delta}))/\epsilon)$ as $\epsilon,\delta\rightarrow 0$ (up to a polylogar...
Quantum multiphoton Rabi oscillations in waveguide QED
D. Mukhopadhyay, Jung-Tsung Shen·Oct 24, 2023
The future of quantum information processing hinges on chip-scale nanophotonics, specifically cavity QED and waveguide QED. One of the foremost processes underpinning quantum photonic technologies is the phenomenon of Rabi oscillations, which manifes...
Qudit-Based Spectroscopy for Measurement and Control of Nuclear-Spin Qubits in Silicon Carbide.
Erik Hesselmeier, Pierre Kuna, Istv'an Tak'acs +9 more·Oct 24, 2023
Nuclear spins with hyperfine coupling to single electron spins are highly valuable quantum bits. Here we probe and characterize the particularly rich nuclear-spin environment around single silicon vacancy color centers (V2) in 4H-SiC. By using the el...
Single-shot error correction on toric codes with high-weight stabilizers
Yingjia Lin, Shilin Huang, Kenneth R. Brown·Oct 24, 2023
For quantum error correction codes the required number of measurement rounds typically increases with the code distance when measurements are faulty. Single-shot error correction allows for an error threshold with only one round of noisy syndrome mea...