Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Pushing the Limits of Quantum Computing for Simulating PFAS Chemistry
Emil Dimitrov, Goar Sánchez‐Sanz, J. Nelson +10 more·Nov 2, 2023
Accurate and scalable methods for computational quantum chemistry can accelerate research and development in many fields, ranging from drug discovery to advanced material design. Solving the electronic Schrodinger equation is the core problem of comp...
Quantum variational solving of nonlinear and multidimensional partial differential equations
Abhijat Sarma, Thomas W. Watts, Mudassir Moosa +2 more·Nov 2, 2023
A variational quantum algorithm for numerically solving partial differential equations (PDEs) on a quantum computer was proposed by Lubasch et al. In this paper, we generalize the method introduced by Lubasch et al. to cover a broader class of nonlin...
The Discrete Noise Approximation in Quantum Circuits
Keith R. Fratus, J. Leppakangas, M. Marthaler +1 more·Oct 31, 2023
When modeling the effects of noise on quantum circuits, one often makes the assumption that these effects can be accounted for by individual decoherence events following an otherwise noise-free gate. In this work, we address the validity of this mode...
Fast elementary gates for universal quantum computation with Kerr parametric oscillator qubits
T. Kanao, Hayato Goto·Oct 31, 2023
Kerr parametric oscillators (KPOs) can stabilize the superpositions of coherent states, which can be utilized as qubits, and are promising candidates for realizing hardware-efficient quantum computers. Although elementary gates for universal quantum ...
Electrical Tuning of Neutral and Charged Excitons with 1-nm Gate
Jawaher Almutlaq, Jiangtao Wang, Linsen Li +5 more·Oct 30, 2023
Electrical control of individual spins and photons in solids is key for quantum technologies, but scaling down to small, static systems remains challenging. Here, we demonstrate nanoscale electrical tuning of neutral and charged excitons in monolayer...
Stochastic modeling of superconducting qudits in the dispersive regime
Kangdi Yu, M. Sarihan, J. Kang +6 more·Oct 29, 2023
The field of superconducting quantum computing, based on Josephson junctions, has recently seen remarkable strides in scaling the number of logical qubits. In particular, the fidelities of one- and two-qubit gates have reached the breakeven point wit...
Ultrafast switchable spin-orbit coupling for silicon spin qubits via spin valves
Ranran Cai, Fang-Ge Li, Bao-Chuan Wang +3 more·Oct 27, 2023
Recent experimental breakthroughs, particularly for single-qubit and two-qubit gates exceeding the error correction threshold, highlight silicon spin qubits as leading candidates for fault-tolerant quantum computation. In the existing architecture, i...
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...
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...
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...
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...
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...
Continuous-variable quantum computation of the O(3) model in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mo>+</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math> dimensions
Raghav G. Jha, Felix Ringer, G. Siopsis +1 more·Oct 19, 2023
We formulate the $O(3)$ non-linear sigma model in 1+1 dimensions as a limit of a three-component scalar field theory restricted to the unit sphere in the large squeezing limit. This allows us to describe the model in terms of the continuous variable ...
Native Two-Qubit Gates in Fixed-Coupling, Fixed-Frequency Transmons Beyond Cross-Resonance Interaction
K. X. Wei, I. Lauer, E. Pritchett +3 more·Oct 18, 2023
Fixed-frequency superconducting qubits demonstrate remarkable success as platforms for stable and scalable quantum computing. Cross-resonance gates have been the workhorse of fixed-coupling, fixed-frequency superconducting processors, leveraging the ...
Non-asymptotic Approximation Error Bounds of Parameterized Quantum Circuits
Zhan Yu, Qiuhao Chen, Yuling Jiao +4 more·Oct 11, 2023
Parameterized quantum circuits (PQCs) have emerged as a promising approach for quantum neural networks. However, understanding their expressive power in accomplishing machine learning tasks remains a crucial question. This paper investigates the expr...
Quantum state reconstruction via disentanglement with sequential optimization algorithm
Juan Yao·Oct 10, 2023
In this work, we report a novel quantum state reconstruction process based on the disentanglement algorithm. We propose a sequential disentanglement scheme, which can transform an unknown quantum state into a product of computational zero states. The...
Single-spin-qubit geometric gate in a silicon quantum dot
Rong-Long Ma, Ao-Ran Li, Chu Wang +11 more·Oct 10, 2023
Preserving qubit coherence and maintaining high-fidelity qubit control under complex noise environment is an enduring challenge for scalable quantum computing. Here we demonstrate an addressable fault-tolerant single spin qubit with an average contro...
Efficient Quantum Circuit Simulation by Tensor Network Methods on Modern GPUs
Feng Pan, Hanfeng Gu, Lvlin Kuang +2 more·Oct 6, 2023
Efficient simulation of quantum circuits has become indispensable with the rapid development of quantum hardware. The primary simulation methods are based on state vectors and tensor networks. As the number of qubits and quantum gates grows larger in...
Problem-tailored Simulation of Energy Transport on Noisy Quantum Computers
I. Chen, Kl'ee Pollock, Yongxin Yao +2 more·Oct 5, 2023
The transport of conserved quantities like spin and charge is fundamental to characterizing the behavior of quantum many-body systems. Numerically simulating such dynamics is generically challenging, which motivates the consideration of quantum compu...
Adaptive variational ground state preparation for spin-1 models on qubit-based architectures
João C. Getelina, Cai-Zhuang Wang, T. Iadecola +2 more·Oct 5, 2023
We apply the adaptive variational quantum imaginary time evolution (AVQITE) method to prepare ground states of one-dimensional spin $S=1$ models. We compare different spin-to-qubit encodings (standard binary, Gray, unary, and multiplet) with regard t...