Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Noise-Robust End-to-End Quantum Control using Deep Autoregressive Policy Networks
Jiahao Yao, Paul Köttering, Hans Gundlach +2 more·Dec 12, 2020
Variational quantum eigensolvers have recently received increased attention, as they enable the use of quantum computing devices to find solutions to complex problems, such as the ground energy and ground state of strongly-correlated quantum many-bod...
Learning from Physics Experiments with Quantum Computers: Applications in Muon Spectroscopy
Sam McArdle·Dec 11, 2020
Computational physics is an important tool for analysing, verifying, and -- at times -- replacing physical experiments. Nevertheless, simulating quantum systems and analysing quantum data has so far resisted an efficient classical treatment in full g...
Correlated charge noise and relaxation errors in superconducting qubits
C. Wilen, S. Abdullah, N. Kurinsky +19 more·Dec 10, 2020
The central challenge in building a quantum computer is error correction. Unlike classical bits, which are susceptible to only one type of error, quantum bits (qubits) are susceptible to two types of error, corresponding to flips of the qubit state a...
Resilience of Quantum Random Access Memory to Generic Noise
Connor T. Hann, Gideon Lee, S. Girvin +1 more·Dec 9, 2020
Quantum random access memory (QRAM)--memory which stores classical data but allows queries to be performed in superposition--is required for the implementation of numerous quantum algorithms. While naive implementations of QRAM are highly susceptible...
Quantum Error Correction Thresholds for the Universal Fibonacci Turaev-Viro Code
Alexis Schotte, Guanyu Zhu, Lander Burgelman +1 more·Dec 8, 2020
We consider a two-dimensional quantum memory of qubits on a torus which encode the extended Fibonacci string-net code, and devise strategies for error correction when those qubits are subjected to depolarizing noise. Building on the concept of tube a...
Robust and fast post-processing of single-shot spin qubit detection events with a neural network
Tom Struck, Javed Lindner, Arne Hollmann +4 more·Dec 8, 2020
Establishing low-error and fast detection methods for qubit readout is crucial for efficient quantum error correction. Here, we test neural networks to classify a collection of single-shot spin detection events, which are the readout signal of our qu...
Building a Fault-Tolerant Quantum Computer Using Concatenated Cat Codes
C. Chamberland, Kyungjoo Noh, Patricio Arrangoiz-Arriola +13 more·Dec 7, 2020
We present a comprehensive architectural analysis for a fault-tolerant quantum computer based on cat codes concatenated with outer quantum error-correcting codes. For the physical hardware, we propose a system of acoustic resonators coupled to superc...
Low depth algorithms for quantum amplitude estimation
Tudor Giurgică-Tiron, Iordanis Kerenidis, Farrokh Labib +2 more·Dec 6, 2020
We design and analyze two new low depth algorithms for amplitude estimation (AE) achieving an optimal tradeoff between the quantum speedup and circuit depth. For $\beta \in (0,1]$, our algorithms require $N= O( \frac{1}{ \epsilon^{1+\beta}})$ oracle ...
Quantum Circuits for Collective Amplitude Damping in Two-Qubit Systems.
Y. Hama·Dec 4, 2020
Quantum computers have now appeared in our society and are utilized for the investigation of science and engineering. At present, they have been built as intermediate-size computers containing about fifty qubits and are weak against noise effects. He...
Implementation of measurement reduction for the variational quantum eigensolver
Alexis Ralli, P. Love, A. Tranter +1 more·Dec 4, 2020
One limitation of the variational quantum eigensolver algorithm is the large number of measurement steps required to estimate different terms in the Hamiltonian of interest. Unitary partitioning reduces this overhead by transforming the problem Hamil...
Efficient Algorithms for Causal Order Discovery in Quantum Networks
Ge Bai, Yadong Wu, Yan Zhu +2 more·Dec 3, 2020
Given black-box access to the input and output systems, we develop the first efficient quantum causal order discovery algorithm with polynomial query complexity with respect to the number of systems. We model the causal order with quantum combs, and ...
Recycling qubits in near-term quantum computers
Galit Anikeeva, Isaac H. Kim, P. Hayden·Dec 3, 2020
Quantum computers are capable of efficiently contracting unitary tensor networks, a task that is likely to remain difficult for classical computers. For instance, networks based on matrix product states or the multi-scale entanglement renormalization...
All-optical long-distance quantum communication with Gottesman-Kitaev-Preskill qubits
Kosuke Fukui, R. N. Alexander, P. van Loock·Nov 30, 2020
Quantum repeaters are a promising platform for realizing long-distance quantum communication and thus could form the backbone of a secure quantum internet, a scalable quantum network, or a distributed quantum computer. Repeater protocols that encode ...
Algorithmic Primitives for Quantum-Assisted Quantum Control.
G. Policharla, Sai Vinjanampathy·Nov 27, 2020
We present two primitive algorithms to evaluate overlaps and transition matrix time series, which are then used to construct several quantum-assisted quantum control algorithms. Unlike previous approaches, our method bypasses tomographically complete...
A game of quantum advantage: linking verification and simulation
Daniel Stilck França, R. García-Patrón·Nov 24, 2020
We present a formalism that captures the process of proving quantum superiority to skeptics as an interactive game between two agents, supervised by a referee. Bob, is sampling from a classical distribution on a quantum device that is supposed to dem...
Particle Track Classification Using Quantum Associative Memory
L. Ice, G. Quiroz, Andrea Delgado +1 more·Nov 24, 2020
Pattern recognition algorithms are commonly employed to simplify the challenging and necessary step of track reconstruction in sub-atomic physics experiments. Aiding in the discrimination of relevant interactions, pattern recognition seeks to acceler...
Classical Shadows with Noise
Dax Enshan Koh, Sabee Grewal·Nov 23, 2020
The classical shadows protocol, recently introduced by Huang, Kueng, and Preskill [Nat. Phys. 16, 1050 (2020)], is a quantum-classical protocol to estimate properties of an unknown quantum state. Unlike full quantum state tomography, the protocol can...
Single-mode fiber coupling with a M-SPGD algorithm for long-range quantum communications.
Kui-Xing Yang, Maimaiti Abulizi, Yuhuai Li +7 more·Nov 23, 2020
Satellite-based quantum communication is a promising approach for realizing global-scale quantum networks. For free-space quantum channel, single-mode fiber coupling is particularly important for improving the signal-to-noise ratio of daylight quantu...
Securing Quantum Computations in the NISQ Era
D. Leichtle, Luka Music, E. Kashefi +1 more·Nov 19, 2020
Recent experimental achievements motivate an ever-growing interest from companies starting to feel the limitations of classical computing. Yet, in light of ongoing privacy scandals, the future availability of quantum computing through remotely access...
Robust Shadow Estimation
Senrui Chen, Wenjun Yu, Pei Zeng +1 more·Nov 19, 2020
Efficiently estimating properties of large and strongly coupled quantum systems is a central focus in many-body physics and quantum information theory. While quantum computers promise speedups for many such tasks, near-term devices are prone to noise...