Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Bounds on stabilizer measurement circuits and obstructions to local implementations of quantum LDPC codes
Nicolas Delfosse, M. Beverland, Maxime Tremblay·Sep 29, 2021
In this work we establish lower bounds on the size of Clifford circuits that measure a family of commuting Pauli operators. Our bounds depend on the interplay between a pair of graphs: the Tanner graph of the set of measured Pauli operators, and the ...
Quantum Simulation of Conformal Field Theory
T. Osborne, Alexander Stottmeister·Sep 29, 2021
Conformal field theory, describing systems with scaling symmetry, plays a crucial role throughout physics. We describe a quantum algorithm to simulate the dynamics of conformal field theories, including the action of local conformal transformations. ...
Low-Depth Unitary Coupled Cluster Theory for Quantum Computation.
Jia Chen, Hai-Ping Cheng, J. Freericks·Sep 29, 2021
The unitary coupled cluster (UCC) approximation is one of the more promising wave function ansätzes for electronic structure calculations on quantum computers via the variational quantum eigensolver algorithm. However, for large systems with many orb...
Gottesman-Kitaev-Preskill codes: A lattice perspective
J. Conrad, Jens Eisert, F. Arzani·Sep 29, 2021
We examine general Gottesman-Kitaev-Preskill (GKP) codes for continuous-variable quantum error correction, including concatenated GKP codes, through the lens of lattice theory, in order to better understand the structure of this class of stabilizer c...
Quantum minimal surfaces from quantum error correction
C. Akers, Geoff Penington·Sep 29, 2021
We show that complementary state-specific reconstruction of logical (bulk) operators is equivalent to the existence of a quantum minimal surface prescription for physical (boundary) entropies. This significantly generalizes both sides of an equivalen...
Computing Ground State Properties with Early Fault-Tolerant Quantum Computers
Ruizhe Zhang, Guoming Wang, Peter D. Johnson·Sep 28, 2021
Significant effort in applied quantum computing has been devoted to the problem of ground state energy estimation for molecules and materials. Yet, for many applications of practical value, additional properties of the ground state must be estimated....
Protocol for temperature sensing using a three-level transmon circuit
A. Sultanov, M. Kuzmanović, A. V. Lebedev +1 more·Sep 28, 2021
We present a method for in situ temperature measurement of superconducting quantum circuits, by using the first three levels of a transmon device to which we apply a sequence of π gates. Our approach employs projective dispersive readout and utilizes...
Quantum simulation and ground state preparation for the honeycomb Kitaev model
Tatiana A. Bespalova, O. Kyriienko·Sep 28, 2021
We propose a quantum protocol that allows preparing a ground state (GS) of the honeycomb Kitaev model. Our approach efficiently uses underlying symmetries and techniques from topological error correction. It is based on the stabilization procedure, t...
Designing the Quantum Channels Induced by Diagonal Gates
Jingzhen Hu, Q. Liang, R. Calderbank·Sep 28, 2021
The challenge of quantum computing is to combine error resilience with universal computation. Diagonal gates such as the transversal T gate play an important role in implementing a universal set of quantum operations. This paper introduces a framewor...
Quantum walk approach to simulating parton showers
Khadeejah Bepari, Sarah Malik, M. Spannowsky +1 more·Sep 28, 2021
This paper presents a novel quantum walk approach to simulating parton showers on a quantum computer. We demonstrate that the quantum walk paradigm offers a natural and more efficient approach to simulating parton showers on quantum devices, with the...
SU(2) hyper-clocks: Quantum engineering of spinor interferences for time and frequency metrology
T. Zanon-Willette, D. Wilkowski, R. Lefevre +2 more·Sep 28, 2021
In 1949, Ramsey’s method of separated oscillating fields was elaborated boosting over many decades metrological performances of atomic clocks and becoming the standard technique for very high precision spectroscopic measurements. A generalization of t...
Quantum Algorithms for Anomaly Detection Using Amplitude Estimation
M. Guo, Hailing Liu, Yongmei Li +4 more·Sep 28, 2021
Anomaly detection plays a critical role in fraud detection, health care, intrusion detection, military surveillance, etc. Anomaly detection algorithm based on density estimation (called ADDE algorithm) is one of widely used algorithms. Liang et al. p...
Flexibility of the factorized form of the unitary coupled cluster Ansatz.
Jia Chen, Hai-Ping Cheng, J. Freericks·Sep 28, 2021
The factorized form of the unitary coupled cluster Ansatz is a popular state preparation Ansatz for electronic structure calculations of molecules on quantum computers. It is often viewed as an approximation (based on the Trotter product formula) for...
Outcome determinism in measurement-based quantum computation with qudits
Robert I. Booth, A. Kissinger, D. Markham +2 more·Sep 28, 2021
In measurement-based quantum computing (MBQC), computation is carried out by a sequence of measurements and corrections on an entangled state. Flow, and related concepts, are powerful techniques for characterising the dependence of the corrections on...
Switch networks for photonic fusion-based quantum computing
Sara Bartolucci, P. Birchall, D. Bonneau +6 more·Sep 28, 2021
Fusion-based quantum computing (FBQC) offers a powerful approach to building a fault-tolerant universal quantum computer using photonic components — single-photon sources, linear-optical circuits, single-photon detectors, and optical switching with f...
Hexagonal matching codes with two-body measurements
James R. Wootton·Sep 27, 2021
Matching codes are stabilizer codes based on Kitaev’s honeycomb lattice model. The hexagonal form of these codes are particularly well-suited to the heavy-hexagon device layouts currently pursued in the hardware of IBM quantum. Here we show how the s...
Quantum causal unravelling
Ge Bai, Yadong Wu, Yan Zhu +2 more·Sep 27, 2021
Complex processes often arise from sequences of simpler interactions involving a few particles at a time. These interactions, however, may not be directly accessible to experiments. Here we develop the first efficient method for unravelling the causa...
Efficient experimental characterization of quantum processes via compressed sensing on an NMR quantum processor
Akshay Gaikwad, Arvind, K. Dorai·Sep 27, 2021
We employ the compressed sensing (CS) algorithm and a heavily reduced data set to experimentally perform true quantum process tomography (QPT) on an NMR quantum processor. We obtain the estimate of the process matrix χ\documentclass[12pt]{minimal} \u...
State preparation and evolution in quantum computing: A perspective from Hamiltonian moments
Joseph C. Aulicino, Trevor Keen, Bo Peng·Sep 27, 2021
Quantum algorithms on the noisy intermediate-scale quantum (NISQ) devices are expected to simulate quantum systems that are classically intractable to demonstrate quantum advantages. However, the non-negligible gate error on the NISQ devices impedes ...
Pricing Multi-Asset Derivatives by Finite-Difference Method on a Quantum Computer
Koichi Miyamoto, K. Kubo·Sep 27, 2021
Following the recent great advance of quantum computing technology, there are growing interests in its applications to industries, including finance. In this article, we focus on derivative pricing based on solving the Black–Scholes partial different...