Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Towards low loss non-volatile phase change materials in mid index waveguides
J. Faneca, I. Zeimpekis, S. Ilie +4 more·Jan 26, 2021
Photonic integrated circuits currently use platform intrinsic thermo-optic and electro-optic effects to implement dynamic functions such as switching, modulation and other processing. Currently, there is a drive to implement field programmable photon...
Experimental quantum speed-up in reinforcement learning agents
V. Saggio, B. E. Asenbeck, A. Hamann +10 more·Jan 26, 2021
As the field of artificial intelligence advances, the demand for algorithms that can learn quickly and efficiently increases. An important paradigm within artificial intelligence is reinforcement learning1, where decision-making entities called agent...
Error-correcting entanglement swapping using a practical logical photon encoding
P. Hilaire, Edwin Barnes, S. Economou +1 more·Jan 26, 2021
Several emerging quantum technologies, including quantum networks, modular and fusion-based quantum computing, rely crucially on the ability to perform photonic Bell state measurements. Therefore, photon losses and the 50% success probablity upper bo...
QIRO: A Static Single Assignment-based Quantum Program Representation for Optimization
David Ittah, Thomas Häner, V. Kliuchnikov +1 more·Jan 26, 2021
We propose an IR for quantum computing that directly exposes quantum and classical data dependencies for the purpose of optimization. The Quantum Intermediate Representation for Optimization(QIRO) consists of two dialects, one input dialect and one t...
Sub-quantum Fisher information
M. Cerezo, A. Sone, J. Beckey +1 more·Jan 25, 2021
The quantum Fisher information (QFI) plays a crucial role in quantum information theory and in many practical applications such as quantum metrology. However, computing the QFI is generally a computationally demanding task. In this work we analyze a ...
SpinQ Gemini: a desktop quantum computer for education and research
Shi-Yao Hou, Guanru Feng, Zipeng Wu +13 more·Jan 25, 2021
SpinQ Gemini is a commercial desktop quantum computer designed and manufactured by SpinQ Technology. It is an integrated hardware-software system. The first generation product with two qubits was launched in January 2020. The hardware is based on NMR...
QFold: quantum walks and deep learning to solve protein folding
Pablo Antonio Moreno Casares, Roberto Campos, M. Martin-Delgado·Jan 25, 2021
We develop quantum computational tools to predict the 3D structure of proteins, one of the most important problems in current biochemical research. We explain how to combine recent deep learning advances with the well known technique of quantum walks...
Exploiting Symmetry Reduces the Cost of Training QAOA
Ruslan Shaydulin, Stefan M. Wild·Jan 25, 2021
A promising approach to the practical application of the quantum approximate optimization algorithm (QAOA) is finding QAOA parameters classically in simulation and sampling the solutions from QAOA with optimized parameters on a quantum computer. Doin...
Quantum Learning Based Nonrandom Superimposed Coding for Secure Wireless Access in 5G URLLC
Dongyang Xu, Pinyi Ren·Jan 24, 2021
Secure wireless access in ultra-reliable low-latency communications (URLLC), which is a critical aspect of 5G security, has become increasingly important due to its potential support of grant-free configuration. In grant-free URLLC, precise allocatio...
Machine learning of high dimensional data on a noisy quantum processor
E. Peters, J. Caldeira, A. Ho +6 more·Jan 23, 2021
Quantum kernel methods show promise for accelerating data analysis by efficiently learning relationships between input data points that have been encoded into an exponentially large Hilbert space. While this technique has been used successfully in sm...
Quasiprobability decompositions with reduced sampling overhead
C. Piveteau, David Sutter, Stefan Woerner·Jan 22, 2021
Quantum error-mitigation techniques can reduce noise on current quantum hardware without the need for fault-tolerant quantum error correction. For instance, the quasiprobability method simulates a noise-free quantum computer using a noisy one, with t...
Quantum simulation of the ground-state Stark effect in small molecules: a case study using IBM Q
C. Tavares, S. Oliveira, V. Fernandes +2 more·Jan 22, 2021
As quantum computing approaches its first commercial implementations, quantum simulation emerges as a potentially ground-breaking technology for several domains, including biology and chemistry. However, taking advantage of quantum algorithms in quan...
Practical quantum encryption protocol with varying encryption configurations
Junxu Li, Zixuan Hu, S. Kais·Jan 22, 2021
Quantum communication is an important application that derives from the burgeoning field of quantum information and quantum computation. Focusing on secure communication, quantum cryptography has two major directions of development, namely quantum ke...
Hoare meets Heisenberg: A Lightweight Logic for Quantum Programs
Aarthi Sundaram, Robert Rand, Kartik Singhal +2 more·Jan 22, 2021
We show that Gottesman's (1998) semantics for Clifford circuits based on the Heisenberg representation gives rise to a lightweight Hoare-like logic for efficiently characterizing a common subset of quantum programs. Our applications include (i) certi...
Fusion-based quantum computation
Sara Bartolucci, P. Birchall, H. Bombin +10 more·Jan 22, 2021
Fusion gates are common operations in photonic quantum information platforms, where they are employed to create entanglement. Here, the authors propose a quantum computation scheme where the same measurements used to generate entanglement can also be...
Improved Accuracy on Noisy Devices by Nonunitary Variational Quantum Eigensolver for Chemistry Applications.
F. Benfenati, G. Mazzola, Chiara Capecci +4 more·Jan 22, 2021
We propose a modification of the Variational Quantum Eigensolver algorithm for electronic structure optimization using quantum computers, named nonunitary Variational Quantum Eigensolver (nu-VQE), in which a nonunitary operator is combined with the o...
Variational quantum solver employing the PDS energy functional
B. Peng, K. Kowalski·Jan 21, 2021
Recently a new class of quantum algorithms that are based on the quantum computation of the connected moment expansion has been reported to find the ground and excited state energies. In particular, the Peeters-Devreese-Soldatov (PDS) formulation is ...
Information scrambling in quantum circuits
X. Mi, P. Roushan, C. Quintana +92 more·Jan 21, 2021
Description Quantum scrambling Information spreading in interacting quantum systems is of relevance to a wide range of settings, from black holes to strange metals. Mi et al. used the Sycamore quantum processor to study this process. Through judicial...
Noisy intermediate-scale quantum (NISQ) algorithms
Kishor Bharti, Alba Cervera-Lierta, T. Kyaw +11 more·Jan 21, 2021
A universal fault-tolerant quantum computer that can solve efficiently problems such as integer factorization and unstructured database search requires millions of qubits with low error rates and long coherence times. While the experimental advanceme...
Sparse Reconstruction for Radar Imaging Based on Quantum Algorithms
Xiao-wen Liu, Chen Dong, Ying Luo +3 more·Jan 21, 2021
The sparse-driven radar imaging can obtain high-resolution images about a target scene with the down-sampled data. However, the huge computational complexity of the classical sparse recovery method for the particular situation seriously affects the p...