Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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...
Robust Estimation of the Quantum Fisher Information on a Quantum Processor
Vittorio Vitale, A. Rath, P. Jurcevic +3 more·Jul 31, 2023
We present the experimental measurement, on a quantum processor, of a series of polynomial lower bounds that to the quantum Fisher information (QFI), a fundamental quantity for certifying multipartite entanglement that is useful for metrological appl...
Long-range <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>C</mml:mi><mml:mi>C</mml:mi><mml:mi mathvariant="normal">Φ</mml:mi></mml:mrow></mml:math> gates via radio-frequency-induced Förster resonances
I. Ashkarin, S. Lepoutre, P. Pillet +3 more·Jul 24, 2023
Registers of trapped neutral atoms, excited to Rydberg states to induce strong long-distance interactions, are extensively studied for direct applications in quantum computing. Here we present a CCΦ quantum phase gate protocol based on radio-frequenc...
Charge and entanglement criticality in a U(1)-symmetric hybrid circuit of qubits
Ahana Chakraborty, Kun Chen, A. Zabalo +2 more·Jul 24, 2023
We study critical properties of the entanglement and charge-sharpening measurement-induced phase transitions in a non-unitary quantum circuit evolving with a U(1) conserved charge. Our numerical estimation of the critical properties of the entangleme...
Scalable tensor-network error mitigation for near-term quantum computing
Sergei E. Filippov, Matea Leahy, M. Rossi +1 more·Jul 21, 2023
Until fault-tolerance becomes implementable at scale, quantum computing will heavily rely on noise mitigation techniques. While methods such as zero noise extrapolation with probabilistic error amplification (ZNE-PEA) and probabilistic error cancella...
A new basis for Hamiltonian SU(2) simulations
C. Bauer, Irian D'Andrea, M. Freytsis +1 more·Jul 21, 2023
Due to rapidly improving quantum computing hardware, Hamiltonian simulations of relativistic lattice field theories have seen a resurgence of attention. This computational tool requires turning the formally infinite-dimensional Hilbert space of the f...
Improved Single-Shot Qubit Readout Using Twin rf-SET Charge Correlations
S. Serrano, M. Feng, W. H. Lim +11 more·Jul 15, 2023
High fidelity qubit readout is critical in order to obtain the thresholds needed to implement quantum error correction protocols and achieve fault-tolerant quantum computing. Large-scale silicon qubit devices will have densely-packed arrays of quantu...
Phase transitions in sampling and error correction in local Brownian circuits
S. Sahu, Shao-Kai Jian·Jul 9, 2023
We study the emergence of anticoncentration and approximate unitary design behavior in local Brownian circuits. The dynamics of circuit averaged moments of the probability distribution and entropies of the output state can be represented as imaginary...
Measurement-induced phase transitions in the toric code
Amir-Reza Negari, S. Sahu, T. Hsieh·Jul 5, 2023
We show how distinct phases of matter can be generated by performing random single-qubit measurements on a subsystem of toric code. Using a parton construction, such measurements map to random Gaussian tensor networks, and in particular, random Pauli...
Efficient Sampling of Noisy Shallow Circuits Via Monitored Unraveling
Zihan Cheng, Matteo Ippoliti·Jun 28, 2023
We introduce a classical algorithm for sampling the output of shallow, noisy random circuits on two-dimensional qubit arrays. The algorithm builds on the recently-proposed"space-evolving block decimation"(SEBD) and extends it to the case of noisy cir...