Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Fidelity bounds for device-independent advantage distillation
Thomas Hahn, E. Y. Tan·May 7, 2021
It is known that advantage distillation (that is, information reconciliation using two-way communication) improves noise tolerances for quantum key distribution (QKD) setups. Two-way communication is hence also of interest in the device-independent c...
Conditions for Equivalent Noise Sensitivity of Geometric and Dynamical Quantum Gates
R. K. Colmenar, U. Güngördü, J. Kestner·May 6, 2021
Geometric quantum gates are often expected to be more resilient than dynamical gates against certain types of error, which would make them ideal for robust quantum computing. However, this is still up for debate due to seemingly conflicting results in...
Pauli Error Estimation via Population Recovery
S. Flammia, R. O'Donnell·May 6, 2021
Motivated by estimation of quantum noise models, we study the problem of learning a Pauli channel, or more generally the Pauli error rates of an arbitrary channel. By employing a novel reduction to the "Population Recovery" problem, we give an extrem...
ReShape: A Decoder for Hypergraph Product Codes
A. O. Quintavalle, E. Campbell·May 5, 2021
The design of decoding algorithms is a significant technological component in the development of fault-tolerant quantum computers. Often design of quantum decoders is inspired by classical decoding algorithms, but there are no general principles for ...
Error Mitigation in Quantum Computers through Instruction Scheduling
Kaitlin N. Smith, Gokul Subramanian Ravi, Prakash Murali +4 more·May 4, 2021
Quantum systems have potential to demonstrate significant computational advantage, but current quantum devices suffer from the rapid accumulation of error that prevents the storage of quantum information over extended periods. The unintentional coupl...
Quantum Advantage with Shallow Circuits under Arbitrary Corruption
Atsuya Hasegawa, Franccois Le Gall·May 3, 2021
Recent works by Bravyi, Gosset and K\"onig (Science 2018), Bene Watts et al. (STOC 2019), Coudron, Stark and Vidick (QIP 2019) and Le Gall (CCC 2019) have shown unconditional separations between the computational powers of shallow (i.e., small-depth)...
Hot-Start Optimization for Variational Quantum Eigensolver
Belozerova Polina, S. Arthur, Zotov Yuriy +2 more·Apr 30, 2021
The Variational Quantum Eigensolver (VQE) is one the most perspective algorithms for simulation of quantum many body physics that have recently attached a lot of attention and believed would be practical for implementation on the near term quantum de...
Universal set of quantum gates for the flip-flop qubit in the presence of 1/f noise
E. Ferraro, Davide Rei, M. Paris +1 more·Apr 29, 2021
Impurities hosted in semiconducting solid matrices represent an extensively studied platform for quantum computing applications. In this scenario, the so-called flip-flop qubit emerges as a convenient choice for scalable implementations in silicon. F...
Relaxation of stationary states on a quantum computer yields a unique spectroscopic fingerprint of the computer’s noise
Scott E. Smart, Zixuan Hu, S. Kais +1 more·Apr 29, 2021
Quantum computing has the potential to revolutionize computing, but its significant sensitivity to noise requires sophisticated error correction and mitigation. Traditionally, noise on the quantum device is characterized directly through qubit and ga...
Classification and purification for the independent quantum channel through quantum error-correction
Long Huang, Xiaohua Wu, T. Zhou·Apr 27, 2021
The essence of quantum error-correction is to use redundant Hilbert space to identify and correct errors, and the channel fidelity of the quantum channel does not affect which errors can be identified and corrected. Based on this, it is found that qu...
Model Checking for Verification of Quantum Circuits
M. Ying·Apr 23, 2021
In this talk, we will describe a framework for assertion-based verification (ABV) of quantum circuits by applying model checking techniques for quantum systems developed in our previous work, in which: (i) Noiseless and noisy quantum circuits are mod...
Probe Incompatibility in Multiparameter Noisy Quantum Metrology
F. Albarelli, R. Demkowicz-Dobrzański·Apr 22, 2021
We derive fundamental bounds on the maximal achievable precision in multiparameter noisy quantum metrology, valid under the most general entanglement-assisted adaptive strategy, which are tighter than the bounds obtained by a direct use of single-par...
Homodyne Detection Quadrature Phase Shift Keying Continuous-Variable Quantum key Distribution with High Excess Noise Tolerance
Wen-Bo Liu, Chen-Long Li, Yuan-Mei Xie +7 more·Apr 22, 2021
Discrete-modulated continuous-variable quantum key distribution with homodyne detection is widely recognized for its ease of implementation, efficiency with respect to error correction, and its compatibility with modern optical communication devices....
Tensor Network Quantum Virtual Machine for Simulating Quantum Circuits at Exascale
Thien Nguyen, Dmitry I. Lyakh, E. Dumitrescu +3 more·Apr 21, 2021
The numerical simulation of quantum circuits is an indispensable tool for development, verification, and validation of hybrid quantum-classical algorithms intended for near-term quantum co-processors. The emergence of exascale high-performance comput...
Entanglement Robustness via Spatial Deformation of Identical Particle Wave Functions
Matteo Piccolini, Farzam Nosrati, G. Compagno +3 more·Apr 20, 2021
We address the problem of entanglement protection against surrounding noise by a procedure suitably exploiting spatial indistinguishability of identical subsystems. To this purpose, we take two initially separated and entangled identical qubits inter...
Efficient Measure for the Expressivity of Variational Quantum Algorithms.
Yuxuan Du, Zhuozhuo Tu, Xiao Yuan +1 more·Apr 20, 2021
The superiority of variational quantum algorithms (VQAs) such as quantum neural networks (QNNs) and variational quantum eigensolvers (VQEs) heavily depends on the expressivity of the employed Ansätze. Namely, a simple Ansatz is insufficient to captur...
Practical Quantum Error Correction with the XZZX Code and Kerr-Cat Qubits
A. Darmawan, Benjamin J. Brown, A. Grimsmo +2 more·Apr 19, 2021
The development of robust architectures capable of large-scale fault-tolerant quantum computation should consider both their quantum error-correcting codes and the underlying physical qubits upon which they are built, in tandem. Following this design...
Robust quantum classifier with minimal overhead
D. Park, Carsten Blank, Francesco Petruccione·Apr 16, 2021
To witness quantum advantages in practical settings, substantial efforts are required not only at the hardware level but also on theoretical research to reduce the computational cost of a given protocol. Quantum computation has the potential to signi...
Quantum advantage and noise reduction in distributed quantum computing
J. Avron, O. Casper, Ilan Rozen·Apr 15, 2021
Distributed quantum computing can give substantial noise reduction due to shallower circuits. An experiment illustrates the advantages in the case of Grover search. This motivates studying the quantum advantage of the distributed version of the Simon...
Fast quantum state reconstruction via accelerated non-convex programming
J. Kim, G. Kollias, A. Kalev +2 more·Apr 14, 2021
We propose a new quantum state reconstruction method that combines ideas from compressed sensing, non-convex optimization, and acceleration methods. The algorithm, called Momentum-Inspired Factored Gradient Descent (MiFGD), extends the applicability ...