Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Deterministic Constant-Depth Preparation of the AKLT State on a Quantum Processor Using Fusion Measurements
Kevin C. Smith, E. Crane, N. Wiebe +1 more·Oct 31, 2022
The ground state of the spin-1 Affleck, Kennedy, Lieb and Tasaki (AKLT) model is a paradigmatic example of both a matrix product state and a symmetry-protected topological phase, and additionally holds promise as a resource state for measurement-base...
QNet: A Quantum-Native Sequence Encoder Architecture
Wei-Yen Day, Hao Chen, Min Sun·Oct 31, 2022
This work proposes QNet, a novel sequence encoder model that entirely inferences on the quantum computer using a minimum number of qubits. Let n and $d$ represent the length of the sequence and the embedding size, respectively. The dot-product attent...
Advancing Algorithm to Scale and Accurately Solve Quantum Poisson Equation on Near-term Quantum Hardware
K. Saha, Walter Robson, Connor Howington +3 more·Oct 29, 2022
The Poisson equation has many applications across the broad areas of science and engineering. Most quantum algorithms for the Poisson solver presented so far either suffer from lack of accuracy and/or are limited to very small sizes of the problem, a...
Stochastic Approach for Simulating Quantum Noise Using Tensor Networks
W. Berquist, Danylo Lykov, Minzhao Liu +1 more·Oct 28, 2022
Noisy quantum simulation is challenging since one has to take into account the stochastic nature of the process. The dominating method for it is the density matrix approach. In this paper, we evaluate conditions for which this method is inferior to a...
Study of noise in virtual distillation circuits for quantum error mitigation
Pontus Vikstål, G. Ferrini, S. Puri·Oct 27, 2022
Virtual distillation has been proposed as an error mitigation protocol for estimating the expectation values of observables in quantum algorithms. It proceeds by creating a cyclic permutation of M noisy copies of a quantum state using a sequence of c...
Implementing arbitrary quantum operations via quantum walks on a cycle graph
Jia-Yi Lin, Xinyou Li, Yusheng Shao +2 more·Oct 26, 2022
The quantum circuit model is the most commonly used model for implementing quantum computers and quantum neural networks whose essential tasks are to realize certain unitary operations. Here we propose an alternative approach; we use a simple discret...
Learning to predict arbitrary quantum processes
Hsin-Yuan Huang, Sitan Chen, J. Preskill·Oct 26, 2022
We present an efficient machine learning (ML) algorithm for predicting any unknown quantum process $\mathcal{E}$ over $n$ qubits. For a wide range of distributions $\mathcal{D}$ on arbitrary $n$-qubit states, we show that this ML algorithm can learn ...
Quantum state preparation without coherent arithmetic
Sam McArdle, Andr'as Gily'en, M. Berta·Oct 26, 2022
We introduce a versatile method for preparing a quantum state whose amplitudes are given by some known function. Unlike existing approaches, our method does not require handcrafted reversible arithmetic circuits, or quantum table reads, to encode the...
Universal robust quantum gates by geometric correspondence of noisy quantum evolution
Yong-Ju Hai, Junning Li, Junkai Zeng +2 more·Oct 26, 2022
A key to the next leap in quantum technologies and quantum computing relies on precise and robust control over noisy quantum systems. For the first time, our theory uncovers an essential correspondence between the driven noisy quantum evolution and m...
Digital Quantum Simulation and Circuit Learning for the Generation of Coherent States
Ruilin Liu, Sebastián V. Romero, I. Oregi +3 more·Oct 25, 2022
Coherent states, known as displaced vacuum states, play an important role in quantum information processing, quantum machine learning, and quantum optics. In this article, two ways to digitally prepare coherent states in quantum circuits are introduc...
Implementing Clifford Gates on Stabilizer Codes via Measurement
D. Banfield, Heather Leitch, A. Kay·Oct 25, 2022
We describe a method to use measurements and correction operations in order to implement the Clifford group in a stabilizer code, generalising a result from [Bombin,2011] for topological subsystem colour codes. In subsystem stabilizer codes of distan...
High-fidelity realization of the AKLT state on a NISQ-era quantum processor
Tianqi Chen, R. Shen, Ching Hua Lee +1 more·Oct 25, 2022
The AKLT state is the ground state of an isotropic quantum Heisenberg spin-1 model. It exhibits an excitation gap and an exponentially decaying correlation function, with fractionalized excitations at its boundaries. So far, the one-dimensional AKLT ...
Dual unitaries as maximizers of the distance to local product gates
Shrigyan Brahmachari, R. Rajmohan, S. A. Rather +1 more·Oct 24, 2022
TThe problem of finding the resource free, closest local unitary, to any bipartite unitary gate $U$ is addressed. Previously discussed as a measure of nonlocality, the distance $K_D(U)$ to the nearest product unitary has implications for circuit comp...
Deep-Circuit QAOA
Gereon Koßmann, Lennart Binkowski, Lauritz van Luijk +2 more·Oct 22, 2022
Despite its popularity, several empirical and theoretical studies suggest that the quantum approximate optimization algorithm (QAOA) has persistent issues in providing a substantial practical advantage. Numerical results for few qubits and shallow ci...
Electron charge qubit with 0.1 millisecond coherence time
Xianjing Zhou, Xinhao Li, Qianfan Chen +9 more·Oct 22, 2022
Electron charge qubits are compelling candidates for solid-state quantum computing because of their inherent simplicity in qubit design, fabrication, control and readout. However, electron charge qubits built on conventional semiconductors and superc...
A quantum algorithm for solving open system dynamics on quantum computers using noise
J. Leppäkangas, N. Vogt, Keith R. Fratus +6 more·Oct 21, 2022
In this paper we present a quantum algorithm that uses noise as a resource. The goal of our quantum algorithm is the calculation of operator averages of an open quantum system evolving in time. Selected low-noise system qubits and noisy bath qubits r...
Measurement-based Quantum Computation as a Tangram Puzzle
A. Patil, Yosef P. Jacobson, D. Towsley +1 more·Oct 20, 2022
Measurement-Based Quantum Computing (MBQC), proposed in 2001 is a model of quantum computing that achieves quantum computation by performing a series of adaptive single-qubit measurements on an entangled cluster state. Our project is aimed at introdu...
Decoding Polar Codes via Noisy Quantum Gates: Quantum Circuits and Insights
Srikar Kasi, John Kaewell, Shahab Hamidi-Rad +1 more·Oct 19, 2022
The use of quantum computation for wireless network applications is emerging as a promising paradigm to bridge the performance gap between in-practice and optimal wireless algorithms. While today's quantum technology offers limited number of qubits a...
Non-Abelian braiding of graph vertices in a superconducting processor
T. Andersen, Y. Lensky, K. Kechedzhi +166 more·Oct 19, 2022
A unitary protocol for braiding projective non-Abelian Ising anyons in a generalized stabilizer code is implemented on a superconducting processor, allowing for verification of their fusion rules and realization of their exchange statistics. Indistin...
Classical half-adder using trapped-ion quantum bits: Toward energy-efficient computation
Sagar Silva Pratapsi, P. Huber, Patrick Barthel +3 more·Oct 19, 2022
Reversible computation has been proposed as a future paradigm for energy efficient computation, but so far few implementations have been realized in practice. Quantum circuits, running on quantum computers, are one construct known to be reversible. I...