Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Cooling limits of coherent refrigerators
Rodolfo Reis Soldati, D. Dasari, Jörg Wrachtrup +1 more·Oct 23, 2024
Refrigeration limits are of fundamental and practical importance. We here show that quantum systems can be cooled below existing incoherent cooling bounds by employing coherent virtual qubits, even if the amount of coherence is incompletely known. Vi...
Engineering bosonic codes with quantum lattice gates
Lingzhen Guo, Tangyou Huang, Lei Du·Oct 22, 2024
Bosonic codes offer a hardware-efficient approach to encoding and protecting quantum information with a single continuous-variable bosonic system. However, previous quantum gates lack analytical methods for decomposing quantum circuits and require co...
Optimal conversion of Kochen-Specker sets into bipartite perfect quantum strategies
Stefan Trandafir, A. Cabello·Oct 22, 2024
Bipartite perfect quantum strategies (BPQSs) allow two players isolated from each other to win every trial of a nonlocal game. BPQSs have crucial roles in recent developments in quantum information and quantum computation. However, only few BPQSs wit...
Maximally entangled gluons for any $x$
Yoshitaka Hatta, Jake Montgomery·Oct 21, 2024
Individual quarks and gluons at small-$x$ inside an unpolarized hadron can be regarded as Bell states in which qubits in the spin and orbital angular momentum spaces are maximally entangled. Using the machinery of quantum information science, we gene...
Trace-Distance based End-to-End Entanglement Fidelity with Information Preservation in Quantum Networks
Pankaj Kumar, Binayak Kar, Shan-Hsiang Shen·Oct 21, 2024
Quantum networks hold the potential to revolutionize a variety of fields by surpassing the capabilities of their classical counterparts. Many of these applications necessitate the sharing of high-fidelity entangled pairs among communicating parties. ...
Nearly query-optimal classical shadow estimation of unitary channels
Zihao Li, Changhao Yi, You Zhou +1 more·Oct 18, 2024
Classical shadow estimation (CSE) is a powerful tool for learning the properties of quantum states and quantum processes. Here we consider the CSE task for quantum unitary channels. By querying an unknown unitary channel $\mathcal{U}$ multiple times ...
Measurement-free, scalable, and fault-tolerant universal quantum computing.
Friederike Butt, David F. Locher, Katharina Brechtelsbauer +2 more·Oct 17, 2024
Reliable execution of large-scale quantum algorithms requires robust underlying operations, which is addressed by quantum error correction (QEC). Most modern QEC protocols rely on measurements and feed-forward operations, which are experimentally dem...
An Efficient Error Estimation Method in Quantum Key Distribution
Yingjian Wang, Yilun Hai, Buniechukwu Njoku +3 more·Oct 15, 2024
Error estimation is an important step for error correction in quantum key distribution. Traditional error estimation methods require sacrificing a part of the sifted key, forcing a trade-off between the accuracy of error estimation and the size of th...
Generating entanglement of two acoustic modes by driving the qubit in a circuit quantum acoustodynamics system
Mei-Rong Wei, Qi Guo, Gang Li +1 more·Oct 15, 2024
We propose how to generate the entanglement of two long-lived phonon modes in a circuit quantum acoustodynamics system, which consists of a multi-mode high-frequency bulk acoustic wave resonator and a transmon-type superconducting qubit. Two acoustic...
Low-noise Optomechanical Single Phonon-photon Conversion for Quantum Networks
Liu Chen, Alexander Rolf Korsch, Cauê Moreno Kersul +4 more·Oct 14, 2024
Nano-structured optomechanical crystals (OMC) form an interface between mechanical modes with long coherence times and telecom optical photons, ideal for long-distance distribution of quantum information. However, the implementation of scalable quant...
Wire Codes
Nouédyn Baspin, Dominic Williamson·Oct 14, 2024
Quantum information is fragile and must be protected by a quantum error-correcting code for large-scale practical applications. Recently, highly efficient quantum codes have been discovered which require a high degree of spatial connectivity. This ra...
Bounds on Multipartite Nonlocality via Reduction to Biased Nonlocality
Hafiza Rumlah Amer, Jibran Rashid·Oct 13, 2024
Multipartite information principles are needed to understand nonlocal quantum correlations. Towards that end, we provide optimal bounds on genuine multipartite nonlocality for classes of THRESHOLD games using the LOCCG (Local Operations with Grouping...
Observable measurement-induced transitions
Aleksei Khindanov, I. Aleiner, L. Faoro +1 more·Oct 12, 2024
One of the main postulates of quantum mechanics is that measurements destroy quantum coherence (wave function collapse). Recently it was discovered that in a many-body system dilute local measurements still preserve some coherence across the entire s...
Characterizing quantum codes via the coefficients in Knill-Laflamme conditions
Mengxin Du, Chao Zhang, Y. Poon +1 more·Oct 10, 2024
Quantum error correction (QEC) is essential for protecting quantum information against noise, yet understanding the structure of the Knill-Laflamme (KL) coefficients λij\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepacka...
Galois Symmetries in the Classification and Quantification of Quantum Entanglement
Bilal Benzimoun, A. Sajia·Oct 10, 2024
Quantum entanglement, a cornerstone of quantum mechanics, remains challenging to classify, particularly in multipartite systems. Here, we present a new interpretation of entanglement classification by revealing a profound connection to Galois groups,...
Symmetry-enhanced counterdiabatic quantum algorithm for qudits
Alberto Bottarelli, Mikel Garcia de Andoin, P. Chandarana +4 more·Oct 9, 2024
Qubit-based variational quantum algorithms have undergone rapid development in recent years but still face several challenges. Here, we introduce a symmetry-based enhancement to digitized counterdiabatic quantum algorithms, applicable for qudits of a...
N-qubit universal quantum logic with a photonic qudit and O(N) linear optics elements
A. Delteil·Oct 8, 2024
High-dimensional quantum units of information, or qudits, can carry more than one quantum bit of information in a single degree of freedom and can, therefore, be used to boost the performance of quantum communication and quantum computation protocols...
Integrated Encoding and Quantization to Enhance Quanvolutional Neural Networks
Daniele Lizzio Bosco, Beatrice Portelli, Giuseppe Serra·Oct 8, 2024
Image processing is one of the most promising applications for quantum machine learning. Quanvolutional neural networks with nontrainable parameters are the preferred solution to run on current and near future quantum devices. The typical input prepr...
Positive Bias Makes Tensor-Network Contraction Tractable
Jiaqing Jiang, Jielun Chen, Norbert Schuch +1 more·Oct 7, 2024
Tensor network contraction is a powerful computational tool in quantum many-body physics, quantum information and quantum chemistry. The complexity of contracting a tensor network is thought to mainly depend on its entanglement properties, as reflect...
Quantum Error Propagation
E. Sultanow, Fation Selimllari, Siddhant Dutta +3 more·Oct 7, 2024
Data poisoning attacks on machine learning models aim to manipulate the data used for model training such that the trained model behaves in the attacker's favour. In classical models such as deep neural networks, large chains of dot products do indee...