Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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...
Variational quantum simulation using non-Gaussian continuous-variable systems
Paolo Stornati, Antonio Acín, Ulysse Chabaud +3 more·Oct 24, 2023
This work introduces an approach to quantum simulation by leveraging continuous-variable systems within a photonic hardware-inspired framework. The primary focus is on simulating static properties of the ground state of Hamiltonians associated with i...
Linear Decomposition of Approximate Multicontrolled Single Qubit Gates
Jefferson D. S. Silva, Thiago Melo D. Azevedo, Israel F. Araujo +1 more·Oct 23, 2023
We provide a method for compiling approximate multicontrolled single qubit gates into quantum circuits. Without ancilla qubits, the total number of elementary gates to decompose an n-qubit multicontrolled gate is proportional to 32n elementary operat...
Check-Agnosia based Post-Processor for Message-Passing Decoding of Quantum LDPC Codes
Julien du Crest, F. García-Herrero, M. Mhalla +2 more·Oct 23, 2023
The inherent degeneracy of quantum low-density parity-check codes poses a challenge to their decoding, as it significantly degrades the error-correction performance of classical message-passing decoders. To improve their performance, a post-processin...
Engineered dissipation to mitigate barren plateaus
Antonio Sannia, F. Tacchino, I. Tavernelli +2 more·Oct 23, 2023
Variational quantum algorithms represent a powerful approach for solving optimization problems on noisy quantum computers, with a broad spectrum of potential applications ranging from chemistry to machine learning. However, their performances in prac...
Quantum phase transitions and cat states in cavity-coupled quantum dots
Valerii K. Kozin, D. Miserev, D. Loss +1 more·Oct 23, 2023
We study double quantum dots coupled to a quasistatic cavity mode with high mode-volume compression allowing for strong light-matter coupling. Besides the cavity-mediated interaction, electrons in different double quantum dots interact with each othe...
How to choose a decoder for a fault-tolerant quantum computer? The speed vs accuracy trade-off
Nicolas Delfosse, A. Paz, Alexander Vaschillo +1 more·Oct 23, 2023
Achieving practical quantum advantage requires a classical decoding algorithm to identify and correct faults during computation. This classical decoding algorithm must deliver both accuracy and speed, but in what combination? When is a decoder"fast e...
Boundary scattering tomography of the Bose Hubbard model on general graphs
Abhi Saxena, E. Abbasgholinejad, Arka Majumdar +1 more·Oct 22, 2023
Correlated quantum many-body phenomena in lattice models have been identified as a set of physically interesting problems that cannot be solved classically. Analog quantum simulators, in photonics and microwave superconducting circuits, have emerged ...
With a Few Square Roots, Quantum Computing Is as Easy as Pi
J. Carette, C. Heunen, R. Kaarsgaard +1 more·Oct 21, 2023
Rig groupoids provide a semantic model of Π, a universal classical reversible programming language over finite types. We prove that extending rig groupoids with just two maps and three equations about them results in a model of quantum computing that...
Tensorized Pauli decomposition algorithm
Lukas Hantzko, Lennart Binkowski, Sabhyata Gupta·Oct 20, 2023
This paper introduces a novel general-purpose algorithm for Pauli decomposition that employs matrix slicing and addition rather than expensive matrix multiplication, significantly accelerating the decomposition of multi-qubit matrices. In a detailed ...
Efficient General Waveform Catching by a cavity at a Virtual Absorbing Exceptional Point
Asaf Farhi, Wei Dai, Seunghwi Kim +2 more·Oct 20, 2023
State transfer and photon detection are fundamental processes that have direct implications in fields such as quantum computing and photonic circuits. However, while naturally emitted photons decay exponentially in time, to perfectly capture a photon...