Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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...
Characteristics, implementation, and applications of special perfect entanglers
K. Selvan, S. Balakrishnan·Jul 24, 2023
In this paper, we discuss the characteristics of special perfect entanglers from a new perspective, present the results obtained from the implementation of special perfect entangler circuits using cross-resonance interaction, and discuss their applic...
Characterizing non-Markovian quantum processes by fast Bayesian tomography
R. Y. Su, J. Y. Huang, N. D. Stuyck +15 more·Jul 23, 2023
To push gate performance to levels beyond the thresholds for quantum error correction, it is important to characterize the error sources occurring on quantum gates. However, the characterization of non-Markovian error poses a challenge to current qua...
Time-optimal multi-qubit gates: Complexity, efficient heuristic and gate-time bounds
Pascal Bassler, Markus Heinrich, M. Kliesch·Jul 20, 2023
Multi-qubit entangling interactions arise naturally in several quantum computing platforms and promise advantages over traditional two-qubit gates. In particular, a fixed multi-qubit Ising-type interaction together with single-qubit X-gates can be us...
Fault-tolerant computing with single-qudit encoding in a molecular spin.
Matteo Mezzadri, A. Chiesa, L. Lepori +1 more·Jul 20, 2023
We show that molecular spins represent ideal materials to realize a fault-tolerant quantum computer, in which all quantum operations include protection against leading (dephasing) errors. This is achieved by pursuing a qudit approach, in which logica...
Robust sparse IQP sampling in constant depth
Louis Paletta, Anthony Leverrier, A. Sarlette +2 more·Jul 20, 2023
Between NISQ (noisy intermediate scale quantum) approaches without any proof of robust quantum advantage and fully fault-tolerant quantum computation, we propose a scheme to achieve a provable superpolynomial quantum advantage (under some widely acce...
Mitigation of quantum crosstalk in cross-resonance-based qubit architectures
Peng Zhao·Jul 19, 2023
The Cross-resonance (CR) gate architecture that exploits fixed-frequency transmon qubits and fixed couplings is a leading candidate for quantum computing. Nonetheless, without the tunability of qubit parameters such as qubit frequencies and couplings...
Quantum computation from dynamic automorphism codes
M. Davydova, Nathanan Tantivasadakarn, Shankar Balasubramanian +1 more·Jul 19, 2023
We propose a new model of quantum computation comprised of low-weight measurement sequences that simultaneously encode logical information, enable error correction, and apply logical gates. These measurement sequences constitute a new class of quantu...
Adaptive Trotterization for Time-Dependent Hamiltonian Quantum Dynamics Using Piecewise Conservation Laws.
Hongzheng Zhao, M. Bukov, M. Heyl +1 more·Jul 19, 2023
Digital quantum simulation relies on Trotterization to discretize time evolution into elementary quantum gates. On current quantum processors with notable gate imperfections, there is a critical trade-off between improved accuracy for finer time step...
The Qudit ZH-Calculus: Generalised Toffoli+Hadamard and Universality
Patrick Roy, J. Wetering, L. Yeh·Jul 19, 2023
We introduce the qudit ZH-calculus and show how to generalise all the phase-free qubit rules to qudits. We prove that for prime dimensions d, the phase-free qudit ZH-calculus is universal for matrices over the ring Z[e^2(pi)i/d]. For qubits, there is...
Hamiltonian phase error in resonantly driven CNOT gate above the fault-tolerant threshold
Yiheng Wu, L. Camenzind, A. Noiri +8 more·Jul 18, 2023
Because of their long coherence time and compatibility with industrial foundry processes, electron spin qubits are a promising platform for scalable quantum processors. A full-fledged quantum computer will need quantum error correction, which require...
Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons
H. Levine, A. Haim, Jimmy S. C. Hung +13 more·Jul 17, 2023
Quantum error correction with erasure qubits promises significant advantages over standard error correction due to favorable thresholds for erasure errors. To realize this advantage in practice requires a qubit for which nearly all errors are such er...
Architectures and Circuits for Distributed Quantum Computing
Daniele Cuomo·Jul 16, 2023
This thesis treats networks providing quantum computation based on distributed paradigms. Compared to architectures relying on one processor, a network promises to be more scalable and less fault-prone. Developing a distributed system able to provide...
A superconducting quantum information processor with high qubit connectivity
Gurkan Kartal, G. Simion, Bart Sor'ee·Jul 16, 2023
Coupling of transmon qubits to resonators that serve as storage for information provides alternative routes for quantum computing. Such a scheme paves the way for achieving high qubit connectivity, which is a great challenge in cQED systems. Implemen...
Fast design and scaling of multi-qubit gates in large-scale trapped-ion quantum computers
Lee Peleg, David Schwerdt, Jonathan Nemirovsky +5 more·Jul 14, 2023
Quantum computers based on crystals of trapped ions are a prominent technology for quantum computation. A unique feature of trapped ions is their long-range Coulomb interactions, which can be exploited to realize large-scale multiqubit entanglement g...
Monte Carlo graph search for quantum circuit optimization
B. Rosenhahn, T. Osborne·Jul 14, 2023
The building blocks of quantum algorithms and software are quantum gates, with the appropriate combination of quantum gates leading to a desired quantum circuit. Deep expert knowledge is necessary to discover effective combinations of quantum gates t...
Error mitigation, optimization, and extrapolation on a trapped-ion testbed
Oliver G. Maupin, Ashlyn D. Burch, B. Ruzic +8 more·Jul 13, 2023
Current noisy intermediate-scale quantum (NISQ) trapped-ion devices are subject to errors around 1% per gate for two-qubit gates. These errors significantly impact the accuracy of calculations if left unchecked. A form of error mitigation called Rich...
QDoor: Exploiting Approximate Synthesis for Backdoor Attacks in Quantum Neural Networks
Cheng Chu, Fan Chen, P. Richerme +1 more·Jul 13, 2023
Quantum neural networks (QNNs) succeed in object recognition, natural language processing, and financial analysis. To maximize the accuracy of a QNN on a Noisy Intermediate Scale Quantum (NISQ) computer, approximate synthesis modifies the QNN circuit...
Universal Quantum Walk Control Plane for Quantum Networks
M. G. Andrade, Nitish K. Panigrahy, W. Dai +2 more·Jul 12, 2023
Quantum networks are complex systems formed by the interaction among quantum processors through quantum channels. Analogous to classical computer networks, quantum networks allow for the distribution of quantum operations among quantum processors. In...
Hybrid discrete-continuous compilation of trapped-ion quantum circuits with deep reinforcement learning
Francesco Preti, Michael Schilling, S. Jerbi +4 more·Jul 12, 2023
Shortening quantum circuits is crucial to reducing the destructive effect of environmental decoherence and enabling useful algorithms. Here, we demonstrate an improvement in such compilation tasks via a combination of using hybrid discrete-continuous...