Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Variational Quantum Metrology with Loschmidt Echo
Ran Liu, Ze Wu, Xiaodong Yang +6 more·Nov 22, 2022
By utilizing quantum mechanical effects, such as superposition and entanglement, quantum metrology promises higher precision than the classical strategies. It is, however, practically challenging to realize the quantum advantages. This is mainly due ...
Loschmidt echo and scrambling of systematic errors in tomography -- a quantum signature of chaos
Abinash Sahu, Naga Dileep Varikuti, Vaibhav Madhok·Nov 21, 2022
How does quantum chaos lead to rapid scrambling of information as well as systematic errors across a system when one introduces perturbations in the dynamics? What are its consequences for the reliability of quantum simulations and quantum informatio...
A new twist on the Majorana surface code: Bosonic and fermionic defects for fault-tolerant quantum computation
Campbell McLauchlan, B. B'eri·Nov 21, 2022
Majorana zero modes (MZMs) are promising candidates for topologically-protected quantum computing hardware, however their large-scale use will likely require quantum error correction. Majorana surface codes (MSCs) have been proposed to achieve this. ...
Scrambling and quantum teleportation
Museong Kim, Mi-Ra Hwang, Eylee Jung +1 more·Nov 18, 2022
Scrambling is a concept introduced from information loss problem arising in black hole. In this paper we discuss the effect of scrambling from a perspective of pure quantum information theory regardless of the information loss problem. We introduce 7...
Programmable Heisenberg interactions between Floquet qubits
Long B. Nguyen, Yosep Kim, A. Hashim +9 more·Nov 18, 2022
The trade-off between robustness and tunability is a central challenge in the pursuit of quantum simulation and fault-tolerant quantum computation. In particular, quantum architectures are often designed to achieve high coherence at the expense of tu...
A quantum-bit encoding converter
Tom Darras, B. Asenbeck, G. Guccione +3 more·Nov 18, 2022
A conversion of quantum information between single-photon and cat-state qubits is demonstrated by teleportation using optical hybrid entanglement. The classical limit of conversion is exceeded over the full Bloch sphere, with an average fidelity abov...
Dipolar spin-exchange and entanglement between molecules in an optical tweezer array
Yicheng Bao, Scarlett S. Yu, L. Anderegg +4 more·Nov 17, 2022
Ultracold polar molecules are promising candidate qubits for quantum computing and quantum simulations. Their long-lived molecular rotational states form robust qubits, and the long-range dipolar interaction between molecules provides quantum entangl...
A Parameter Setting Heuristic for the Quantum Alternating Operator Ansatz
James Sud, Stuart Hadfield, E. Rieffel +2 more·Nov 17, 2022
Parameterized quantum circuits are widely studied approaches to tackling challenging optimization problems. A prominent example is the Quantum Alternating Operator Ansatz (QAOA), a generalized approach that builds on the alternating structure of the ...
Beating the break-even point with a discrete-variable-encoded logical qubit
Zhongchu Ni, Sai Li, Xiaowei Deng +12 more·Nov 17, 2022
Quantum error correction (QEC) aims to protect logical qubits from noises by using the redundancy of a large Hilbert space, which allows errors to be detected and corrected in real time^ 1 . In most QEC codes^ 2 – 8 , a logical qubit is encoded in so...
Real-time quantum error correction beyond break-even
V. Sivak, A. Eickbusch, B. Royer +10 more·Nov 16, 2022
The ambition of harnessing the quantum for computation is at odds with the fundamental phenomenon of decoherence. The purpose of quantum error correction (QEC) is to counteract the natural tendency of a complex system to decohere. This cooperative pr...
Optimised Bayesian system identification in quantum devices
T. Stace, Jiayin Chen, Li Li +6 more·Nov 16, 2022
Identifying and calibrating quantitative dynamical models for physical quantum systems is important for a variety of applications. Here we present a closed-loop Bayesian learning algorithm for estimating multiple unknown parameters in a dynamical mod...
Classical Shadow Tomography for Continuous Variables Quantum Systems
Simon Becker, N. Datta, Ludovico Lami +1 more·Nov 14, 2022
In this article we develop a continuous variable (CV) shadow tomography scheme with wide ranging applications in quantum optics. Our work is motivated by the increasing experimental and technological relevance of CV systems in quantum information, qu...
Two-Qutrit Quantum Algorithms on a Programmable Superconducting Processor
Tanay Roy, Ziqian Li, E. Kapit +1 more·Nov 12, 2022
Processing quantum information using quantum three-level systems or qutrits as the fundamental unit is an alternative to contemporary qubit-based architectures with the potential to provide significant computational advantages. We demonstrate a fully...
Quantum Routing for Emerging Quantum Networks
W. Shi, R. Malaney·Nov 11, 2022
Quantum routing, the entanglement of an input quantum signal over multiple output paths, will be an important aspect of future quantum networks. Implementation of such routing in nearterm quantum networks via the noisy quantum devices currently under...
Tuning for Quantum Speedup in Directed Lackadaisical Quantum Walks
Pranay Naredi, J. Kannan, M. S. Santhanam·Nov 11, 2022
Quantum walks constitute an important tool for designing quantum algorithms and information processing tasks. In a lackadaisical walk, in addition to the possibility of moving out of a node, the walker can remain on the same node with some probabilit...
Architectures for Quantum Information Processing
S. Upadhyay, M. Alam, Swaroop Ghosh·Nov 11, 2022
Quantum computing is changing the way we think about computing. Significant strides in research and development for managing and harnessing the power of quantum systems has been made in recent years, demonstrating the potential for transformative qua...
Deterministic single-photon source in the ultrastrong-coupling regime
Jie Peng, Jian-Shun Tang, P. Tang +7 more·Nov 11, 2022
Deterministic single-photon sources are important and ubiquitous in quantum information protocols. However, to the best of our knowledge, none of them work in the ultrastrong light-matter coupling regime, and each excitation process can only emit one...
High-speed thin-film lithium niobate quantum processor driven by a solid-state quantum emitter
Patrik I. Sund, E. Lomonte, S. Paesani +9 more·Nov 10, 2022
Scalable photonic quantum computing architectures pose stringent requirements on photonic processing devices. The needs for low-loss high-speed reconfigurable circuits and near-deterministic resource state generators are some of the most challenging ...
Overcoming leakage in quantum error correction
K. Miao, M. McEwen, J. Atalaya +114 more·Nov 9, 2022
The leakage of quantum information out of the two computational states of a qubit into other energy states represents a major challenge for quantum error correction. During the operation of an error-corrected algorithm, leakage builds over time and s...
A Quantum-Powered Photorealistic Rendering
Yuanfu Yang, Min Sun·Nov 7, 2022
Achieving photorealistic rendering of real-world scenes poses a significant challenge with diverse applications, including mixed reality and virtual reality. Neural networks, extensively explored in solving differential equations, have previously bee...