Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Improving the speed of variational quantum algorithms for quantum error correction
Fabio Zoratti, Giacomo De Palma, B. Kiani +4 more·Jan 12, 2023
We consider the problem of devising a suitable Quantum Error Correction (QEC) procedures for a generic quantum noise acting on a quantum circuit. In general, there is no analytic universal procedure to obtain the encoding and correction unitary gates...
Using the Julia framework to teach quantum entanglement
Shlomo Kashani, David Zaret·Jan 7, 2023
Entanglement, a phenomenon that has puzzled scientists since its discovery, has been extensively studied by many researchers through both theoretical and experimental aspect of both quantum information processing (QIP) and quantum mechanics (QM). But...
Graphical quantum Clifford-encoder compilers from the ZX calculus
A. Khesin, Jonathan Z Lu, P. Shor·Jan 6, 2023
We present a quantum compilation algorithm that maps Clifford encoders, encoding maps for stabilizer quantum codes, to a unique graphical representation in the ZX calculus. Specifically, we develop a canonical form in the ZX calculus and prove canoni...
Taming the Rotating Wave Approximation
D. Burgarth, P. Facchi, R. Hillier +1 more·Jan 5, 2023
The interaction between light and matter is one of the oldest research areas of quantum mechanics, and a field that just keeps on delivering new insights and applications. With the arrival of cavity and circuit quantum electrodynamics we can now achi...
Benchmarking universal quantum gates via channel spectrum
Yanwu Gu, Wei-Feng Zhuang, Xudan Chai +1 more·Jan 5, 2023
Noise remains the major obstacle to scalable quantum computation. Quantum benchmarking provides key information on noise properties and is an important step for developing more advanced quantum processors. However, current benchmarking methods are ei...
Simulating noisy quantum channels via quantum state preparation algorithms
M. S. Zanetti, Douglas F. Pinto, Marcos L. W. Basso +1 more·Dec 28, 2022
In Xin et al (2017 Phys. Rev. A 96 062303) and Wei et al (2018 Sci. China Phys. Mech. Astron. 61 70311), the authors reported an algorithm to simulate, in a circuit-based quantum computer, a general quantum channel (QC). However, the application of t...
On-chip polarization-encoded single-qubit gates with twisted waveguides
Fyodor Morozko, A. Novitsky, A. Mikhalychev +1 more·Dec 27, 2022
Integrated photonics is a remarkable platform for scalable classical and quantum light-based information processing. However, polarization manipulation on a chip despite of its fundamental significance in information processing remains elusive. Polar...
Quantum Federated Learning for Distributed Quantum Networks
Kai Yu, Xin Zhang, Zi Ye +2 more·Dec 25, 2022
Federated learning is a framework that can learn from distributed networks. It attempts to build a global model based on virtual fusion data without sharing the actual data. Nevertheless, the traditional federated learning process encounters two main...
Optimizing one-axis twists for variational Bayesian quantum metrology
Tyler G. Thurtell, A. Miyake·Dec 23, 2022
Quantum metrology and sensing seek advantages in estimating an unknown parameter of some quantum state or channel, using entanglement such as spin squeezing produced by one-axis twists or other quantum resources. In particular, qubit phase estimation...
Generalized Toffoli Gate Decomposition Using Ququints: Towards Realizing Grover’s Algorithm with Qudits
Anstasiia S Nikolaeva, E. Kiktenko, A. Fedorov·Dec 23, 2022
Qubits, which are the quantum counterparts of classical bits, are used as basic information units for quantum information processing, whereas underlying physical information carriers, e.g., (artificial) atoms or ions, admit encoding of more complex m...
Factoring integers with sublinear resources on a superconducting quantum processor
Bao Yan, Z. Tan, Shijie Wei +21 more·Dec 23, 2022
Shor's algorithm has seriously challenged information security based on public key cryptosystems. However, to break the widely used RSA-2048 scheme, one needs millions of physical qubits, which is far beyond current technical capabilities. Here, we r...
Quantum computing on magnetic racetracks with flying domain wall qubits
J. Zou, S. Bosco, B. Pal +3 more·Dec 22, 2022
Domain walls (DWs) on magnetic racetracks are at the core of the field of spintronics, providing a basic element for classical information processing. Here, we show that mobile DWs also provide a blueprint for large-scale quantum computers. Remarkabl...
Learning efficient decoders for quasichaotic quantum scramblers
L. Leone, Salvatore F. E. Oliviero, S. Lloyd +1 more·Dec 21, 2022
Scrambling of quantum information is an important feature at the root of randomization and benchmarking protocols, the onset of quantum chaos, and black-hole physics. Unscrambling this information is possible given perfect knowledge of the scrambler ...
Ultrafast Entanglement Dynamics in Monitored Quantum Circuits
Shengqi Sang, Zhi Li, T. Hsieh +1 more·Dec 20, 2022
Projective measurement, a basic operation in quantum mechanics, can induce seemingly nonlocal effects. In this work, we analyze such effects in many-body systems by studying the non-equilibrium dynamics of weakly monitored quantum circuits, focusing ...
Matrix product channel: Variationally optimized quantum tensor network to mitigate noise and reduce errors for the variational quantum eigensolver
S. Filippov, Boris Sokolov, M. Rossi +5 more·Dec 20, 2022
Quantum processing units boost entanglement at the level of hardware and enable physical simulations of highly correlated electron states in molecules and intermolecular chemical bonds. The variational quantum eigensolver provides a hardware-efficien...
Unitarity Estimation for Quantum Channels
Kean Chen, Qisheng Wang, Peixun Long +1 more·Dec 19, 2022
Estimating the unitarity of an unknown quantum channel <inline-formula> <tex-math notation="LaTeX">$\mathcal {E}$ </tex-math></inline-formula> provides information on how much it is unitary, which is a basic and important problem in quantum device ce...
Hybrid Quantum Singular Spectrum Decomposition for Time Series Analysis
Jasper Postema, P. Bonizzi, G. Koekoek +2 more·Dec 17, 2022
Classical data analysis requires computational efforts that become intractable in the age of Big Data. An essential task in time series analysis is the extraction of physically meaningful information from a noisy time series. One algorithm devised fo...
Unrolling SVT to Obtain Computationally Efficient SVT for N-Qubit Quantum State Tomography
S. Shanmugam, S. Kalyani·Dec 17, 2022
Quantum state tomography aims to estimate the state of a quantum mechanical system which is described by a trace one, Hermitian positive semidefinite complex matrix, given a set of measurements of the state. Existing works focus on estimating the den...
Quantum memory assisted observable estimation
L. Markovich, Attaallah Almasi, Sina Zeytinoğlu +1 more·Dec 15, 2022
The estimation of many-qubit observables is an essential task of quantum information processing. The generally applicable approach is to decompose the observables into weighted sums of multi-qubit Pauli strings, i.e., tensor products of single-qubit ...
Complete Characterization of Quantum Correlations by Randomized Measurements.
Nikolai Wyderka, A. Ketterer, Satoya Imai +5 more·Dec 15, 2022
The fact that quantum mechanics predicts stronger correlations than classical physics is an essential cornerstone of quantum information processing. Indeed, these quantum correlations are a valuable resource for various tasks, such as quantum key dis...