Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Real-time error mitigation for variational optimization on quantum hardware
Matteo Robbiati, Alejandro Sopena, Andrea Papaluca +1 more·Nov 9, 2023
In this work we put forward the inclusion of error mitigation routines in the process of training Variational Quantum Circuit (VQC) models. In detail, we define a Real Time Quantum Error Mitigation (RTQEM) algorithm to assist in fitting functions on ...
Cryogenic Resonant Amplifier for Electron-on-Helium Image Charge Readout
Mikhail Belianchikov, Jakob A. Kraus, Denis Konstantinov·Nov 8, 2023
An electron-on-helium qubit is a promising physical platform for quantum information technologies. Among all the “blueprints” for the qubit realization, a hybrid Rydberg-spin qubit seems to be a promising one toward quantum computing using electron s...
Single-Electron Qubits Based on Quantum Ring States on Solid Neon Surface.
T. Kanai, Dafei Jin, Wei Guo·Nov 4, 2023
Single electrons trapped on solid-neon surfaces have recently emerged as a promising platform for charge qubits. Experimental results have revealed their exceptionally long coherence times, yet the actual quantum states of these trapped electrons, pr...
The quantum cartpole: A benchmark environment for non-linear reinforcement learning
Kai Meinerz, S. Trebst, M. Rudner +1 more·Nov 1, 2023
Feedback-based control is the de-facto standard when it comes to controlling classical stochastic systems and processes. However, standard feedback-based control methods are challenged by quantum systems due to measurement induced backaction and part...
Observing Quantum Measurement Collapse as a Learnability Phase Transition
Utkarsh Agrawal, Javier Lopez-Piqueres, Romain Vasseur +2 more·Oct 31, 2023
During a quantum measurement, superpositions of states with different observable properties probabilistically collapse into one with a sharp value of the measured observable. In macroscopic quantum systems, this collapse arises via a continuous measu...
Coupling conduction-band valleys in SiGe heterostructures via shear strain and Ge concentration oscillations
Benjamin D. Woods, Hudaiba Soomro, E. S. Joseph +4 more·Oct 29, 2023
Engineering conduction-band valley couplings is a key challenge for Si-based spin qubits. Recent work has shown that the most reliable method for enhancing valley couplings entails adding Ge concentration oscillations to the quantum well. However, ul...
Measurement and Feed Forward Induced Entanglement Negativity Transition.
Alireza Seif, Yu-Xin Wang, R. Movassagh +1 more·Oct 27, 2023
We study the interplay between measurement-induced dynamics and conditional unitary evolution in quantum systems. We numerically and analytically investigate commuting random measurement and feed forward (MFF) processes and find a sharp transition in...
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...
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...
Emergence of noise-induced barren plateaus in arbitrary layered noise models
Marco Schumann, Frank K. Wilhelm, Alessandro Ciani·Oct 12, 2023
In variational quantum algorithms the parameters of a parameterized quantum circuit are optimized in order to minimize a cost function that encodes the solution of the problem. The barren plateau phenomenon manifests as an exponentially vanishing dep...
Qubit gate operations in elliptically trapped polariton condensates
L. S. Ricco, I. Shelykh, A. Kavokin·Sep 29, 2023
We consider bosonic condensates of exciton-polaritons optically confined in elliptical traps. A superposition of two non-degenerated p-type states of the condensate oriented along the two main axes of the trap is represented by a point on a Bloch sph...
A real-time, scalable, fast and resource-efficient decoder for a quantum computer
Ben Barber, Kenton M. Barnes, Tomasz Bialas +10 more·Sep 11, 2023
The development of quantum computers will require the careful management of the noise effects associated with qubit performance. However, the decoders responsible for diagnosing noise-induced computational errors must use resources efficiently to ena...
Deformed Fredkin model for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>5</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math> Moore-Read state on thin cylinders
Cristian Voinea, Songyang Pu, A. Kirmani +3 more·Sep 8, 2023
We propose a frustration-free model for the Moore-Read quantum Hall state on sufficiently thin cylinders with circumferences $\lesssim 7$ magnetic lengths. While the Moore-Read Hamiltonian involves complicated long-range interactions between triplets...
Surface reconstruction induced anisotropic energy landscape of bismuth monomers and dimers on the Si(001) surface
Haonan Huang, C. Schon, C. Ast·Sep 6, 2023
Spin qubits have attracted tremendous attention in the effort of building quantum computers over the years. Natural atomic scale candidates are group-V dopants in silicon, not only showing ultra-long lifetimes but also being compatible with current s...
Efficient Classical Shadow Tomography through Many-body Localization Dynamics
Tian-Gang Zhou, P. Zhang·Sep 3, 2023
Classical shadow tomography serves as a potent tool for extracting numerous properties from quantum many-body systems with minimal measurements. Nevertheless, prevailing methods yielding optimal performance for few-body operators necessitate the appl...
Universal quantum computation using atoms in cross-cavity systems
Luiz O. R. Solak, D. Z. Rossatto, C. Villas-Bôas·Aug 28, 2023
Quantum gates are the building blocks of quantum circuits, which in turn are the cornerstones of quantum information processing. In this work, we theoretically investigate a single-step implementation of both a universal two- (CNOT) and three-qubit (...
Autonomous Stabilization of Fock States in an Oscillator against Multiphoton Losses.
Sai Li, Zhongchu Ni, Libo Zhang +8 more·Aug 16, 2023
Fock states with a well-defined number of photons in an oscillator have shown a wide range of applications in quantum information science. Nonetheless, their usefulness has been marred by single and multiphoton losses due to unavoidable environment-i...
High-Photon-Loss Threshold Quantum Computing Using GHZ-State Measurements.
B. Pankovich, A. Kan, Kwok Ho Wan +5 more·Aug 8, 2023
We propose fault-tolerant architectures based on performing projective measurements in the Greenberger-Horne-Zeilinger (GHZ) basis on constant-sized, entangled resource states. We present linear-optical constructions of the architectures, where the G...
Wavefunction branching: when you can't tell pure states from mixed states
Jordan K. Taylor, I. McCulloch·Aug 8, 2023
We propose a definition of wavefunction "branchings": quantum superpositions which can't be feasibly distinguished from the corresponding mixed state, even under time evolution. Our definition is largely independent of interpretations, requiring only...
Measurement-induced criticality is tomographically optimal
A. Akhtar, Hong-ye Hu, Yi-Zhuang You·Aug 3, 2023
We develop a classical shadow tomography protocol utilizing the randomized measurement scheme based on hybrid quantum circuits, which consist of layers of two-qubit random unitary gates mixed with single-qubit random projective measurements. Unlike c...