Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,749 papers in 12 months (-37% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
A Scalable Decoder Micro-architecture for Fault-Tolerant Quantum Computing
Poulami Das, C. Pattison, Srilatha Manne +4 more·Jan 18, 2020
Quantum computation promises significant computational advantages over classical computation for some problems. However, quantum hardware suffers from much higher error rates than in classical hardware. As a result, extensive quantum error correction...
Grover's Algorithm and Many-Valued Quantum Logic
Samuel Hunt, M. Gadouleau·Jan 17, 2020
As the engineering endeavour to realise quantum computers progresses, we consider that such machines need not rely on binary as their de facto unit of information. We investigate Grover's algorithm under a generalised quantum circuit model, in which ...
Optimal two-qubit circuits for universal fault-tolerant quantum computation
A. Glaudell, N. J. Ross, Jacob M. Taylor·Jan 16, 2020
We study two-qubit circuits over the Clifford+CS gate set, which consists of the Clifford gates together with the controlled-phase gate CS = diag(1, 1, 1, i). The Clifford+CS gate set is universal for quantum computation and its elements can be imple...
Entanglement generation via power-of-swap operations between dynamic electron-spin qubits
H. Lepage, A. Lasek, D. Arvidsson-Shukur +1 more·Jan 15, 2020
Surface acoustic waves (SAWs) can create moving quantum dots in piezoelectric materials. Here we show how electron-spin qubits located on dynamic quantum dots can be entangled. Previous theoretical and numerical models of quantum-dot entanglement gen...
Quantum computation of thermal averages in the presence of a sign problem
Giuseppe Clemente, Marco Cardinali, C. Bonati +8 more·Jan 15, 2020
We illustrate the application of Quantum Computing techniques to the investigation of the thermodynamical properties of a simple system, made up of three quantum spins with frustrated pair interactions and affected by a hard sign problem when treated...
Signal processing techniques for efficient compilation of controlled rotations in trapped ions
K. Groenland, Freek Witteveen, K. Schoutens +1 more·Jan 15, 2020
Quantum logic gates with many control qubits are essential in many quantum algorithms, but remain challenging to perform in current experiments. Trapped ion quantum computers natively feature the Mølmer–Sørensen (MS) entangling operation, which effec...
Quantum device fine-tuning using unsupervised embedding learning
N. V. Esbroeck, D. Lennon, H. Moon +8 more·Jan 13, 2020
Quantum devices with a large number of gate electrodes allow for precise control of device parameters. This capability is hard to fully exploit due to the complex dependence of these parameters on applied gate voltages. We experimentally demonstrate ...
A quantum-classical cloud platform optimized for variational hybrid algorithms
Peter J. Karalekas, N. Tezak, E. C. Peterson +3 more·Jan 13, 2020
In order to support near-term applications of quantum computing, a new compute paradigm has emerged—the quantum-classical cloud—in which quantum computers (QPUs) work in tandem with classical computers (CPUs) via a shared cloud infrastructure. In thi...
High-Fidelity Control, Detection, and Entanglement of Alkaline-Earth Rydberg Atoms
I. Madjarov, J. Covey, Adam L. Shaw +7 more·Jan 13, 2020
Trapped neutral atoms have become a prominent platform for quantum science, where entanglement fidelity records have been set using highly-excited Rydberg states. However, controlled two-qubit entanglement generation has so far been limited to alkali...
Software tools for quantum control: improving quantum computer performance through noise and error suppression
H. Ball, M. Biercuk, A. Carvalho +15 more·Jan 13, 2020
Effectively manipulating quantum computing (QC) hardware in the presence of imperfect devices and control systems is a central challenge in realizing useful quantum computers. Susceptibility to noise critically limits the performance and capabilities...
Quantifying computational advantage of Grover’s algorithm with the trace speed
Valentin Gebhart, L. Pezz'e, A. Smerzi·Jan 13, 2020
Despite intensive research, the physical origin of the speed-up offered by quantum algorithms remains mysterious. No general physical quantity, like, for instance, entanglement, can be singled out as the essential useful resource. Here we report a cl...
Span programs and quantum time complexity
A. Cornelissen, S. Jeffery, M. Ozols +1 more·Jan 12, 2020
Span programs are an important model of quantum computation due to their tight correspondence with quantum query complexity. For any decision problem $f$, the minimum complexity of a span program for $f$ is equal, up to a constant factor, to the quan...
Linear programming bounds for quantum amplitude damping codes
Yingkai Ouyang, C. Lai·Jan 12, 2020
Given that approximate quantum error-correcting (AQEC) codes have a potentially better performance than perfect quantum error correction codes, it is pertinent to quantify their performance. While quantum weight enumerators establish some of the best...
Parametric Probabilistic Quantum Memory
Rodrigo S. Sousa, Priscila G. M. dos Santos, T. M. L. Veras +2 more·Jan 11, 2020
Probabilistic Quantum Memory (PQM) is a data structure that computes the distance from a binary input to all binary patterns stored in superposition on the memory. This data structure allows the development of heuristics to speed up artificial neural...
Electrodynamics of Highly Spin-Polarized Tunnel Josephson Junctions
H. G. Ahmad, R. Caruso, A. Pal +5 more·Jan 10, 2020
The continuous development of superconducting electronics is encouraging several studies on hybrid Josephson junctions (JJs) based on superconductor/ferromagnet/superconductor (SFS) heterostructures, as either spintronic devices or switchable element...
Quantum embeddings for machine learning
S. Lloyd, M. Schuld, Aroosa Ijaz +2 more·Jan 10, 2020
Quantum classifiers are trainable quantum circuits used as machine learning models. The first part of the circuit implements a quantum feature map that encodes classical inputs into quantum states, embedding the data in a high-dimensional Hilbert spa...
QSOR: Quantum-Safe Onion Routing
Zsolt Tujner, Thomas Rooijakkers, M. V. Heesch +1 more·Jan 10, 2020
In this work, we propose a study on the use of post-quantum cryptographic primitives for the Tor network in order to make it safe in a quantum world. With this aim, the underlying keying material has first been analysed. We observe that breaking the ...
Quantum computation of molecular response properties
Xiaoxia Cai, W. Fang, H. Fan +1 more·Jan 10, 2020
Accurately predicting response properties of molecules such as the dynamic polarizability and hyperpolarizability using quantum mechanics has been a long-standing challenge with widespread applications in material and drug design. Classical simulatio...
Real-time nanodiamond thermometry probing in vivo thermogenic responses
M. Fujiwara, Simo Sun, A. Dohms +12 more·Jan 9, 2020
Nanoparticle quantum temperature sensors detect subcellular heat generation in a multicellular model organism. Real-time temperature monitoring inside living organisms provides a direct measure of their biological activities. However, it is challengi...
Software Mitigation of Crosstalk on Noisy Intermediate-Scale Quantum Computers
Prakash Murali, D. McKay, M. Martonosi +1 more·Jan 9, 2020
Crosstalk is a major source of noise in Noisy Intermediate-Scale Quantum (NISQ) systems and is a fundamental challenge for hardware design. When multiple instructions are executed in parallel, crosstalk between the instructions can corrupt the quantu...