Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Linear block and convolutional MDS codes to required rate, distance and type
T. Hurley·Sep 14, 2021
Algebraic methods for the design of series of maximum distance separable (MDS) linear block and convolutional codes to required specifications and types are presented. Algorithms are given to design codes to required rate and required error-correctin...
Noise-resistant quantum state compression readout
Chen Ding, Xiao-Yue Xu, Yun-Fei Niu +3 more·Sep 14, 2021
Qubit measurement is generally the most error-prone operation that degrades the performance of near-term quantum devices, and the exponential decay of readout fidelity severely impedes the development of large-scale quantum information processing. Gi...
A thorough introduction to non-relativistic matrix mechanics in multi-qudit systems with a study on quantum entanglement and quantum quantifiers
Lucas Camponogara Viera, Shujian Liao·Sep 14, 2021
Quantum computing is among the most far-reaching technologies of the 21st century, tackling challenges at the cutting edge of physics. This new paradigm in computer science harnesses quantum entanglement, one striking non-intuitive feature of quantum...
Optimal Qubit Mapping with Simultaneous Gate Absorption ICCAD Special Session Paper
Daniel Bochen Tan, J. Cong·Sep 14, 2021
Before quantum error correction (QEC) is achieved, quantum computers focus on noisy intermediate-scale quantum (NISQ) applications. Compared to the well-known quantum algorithms requiring QEC, like Shor's or Grover's algorithm, NISQ applications have...
Local unitary classes of states invariant under permutation subgroups
David W. Lyons, Jesse R. Arnold, Ashley F. Swogger·Sep 14, 2021
The study of entanglement properties of multi-qubit states that are invariant under permutations of qubits is motivated by potential applications in quantum computing, quantum communication, and quantum metrology. In this work, we generalize the noti...
Quantum Krylov subspace algorithms for ground- and excited-state energy estimation
C. Cortes, S. Gray·Sep 14, 2021
Quantum Krylov subspace diagonalization (QKSD) algorithms provide a low-cost alternative to the conventional quantum phase estimation algorithm for estimating the ground and excited-state energies of a quantum many-body system. While QKSD algorithms ...
Approaching the theoretical limit in quantum gate decomposition
P. Rakyta, Z. Zimbor'as·Sep 14, 2021
In this work we propose a novel numerical approach to decompose general quantum programs in terms of single- and two-qubit quantum gates with a CNOT gate count very close to the current theoretical lower bounds. In particular, it turns out that 15 an...
Compact, spatial-mode-interaction-free, ultralow-loss, nonlinear photonic integrated circuits
Xinru Ji, Junqiu Liu, Jijun He +4 more·Sep 14, 2021
Multi-mode waveguides are ubiquitously used in integrated photonics. Although interaction among different spatial waveguide eigenmodes can induce novel nonlinear phenomena, spatial mode interaction is typically undesired. Adiabatic bends, such as Eul...
A universal qudit quantum processor with trapped ions
M. Ringbauer, M. Meth, L. Postler +4 more·Sep 14, 2021
Most quantum computers use binary encoding to store information in qubits—the quantum analogue of classical bits. Yet, the underlying physical hardware consists of information carriers that are not necessarily binary, but typically exhibit a rich mul...
Formal Methods for Quantum Programs: A Survey
Christophe Chareton, Sébastien Bardin, Dongho Lee +3 more·Sep 14, 2021
While recent progress in quantum hardware open the door for significant speedup in certain key areas (cryptography, biology, chemistry, optimization, machine learning, etc), quantum algorithms are still hard to implement right, and the validation of ...
Generative quantum learning of joint probability distribution functions
E. Zhu, S. Johri, D. Bacon +9 more·Sep 13, 2021
Modeling joint probability distributions is an important task in a wide variety of fields. One popular technique for this employs a family of multivariate distributions with uniform marginals called copulas. While the theory of modeling joint distrib...
Distilling GHZ States using Stabilizer Codes
Narayanan Rengaswamy, Ankur Raina, Nithin Raveendran +1 more·Sep 13, 2021
Entanglement distillation is a well-studied problem in quantum information, where one typically starts with n noisy Bell pairs and distills k Bell pairs of higher fidelity. While distilling Bell pairs is the canonical setting, it is important to study...
Realizing quantum convolutional neural networks on a superconducting quantum processor to recognize quantum phases
J. Herrmann, Sergi Masot Llima, A. Remm +15 more·Sep 13, 2021
Quantum computing crucially relies on the ability to efficiently characterize the quantum states output by quantum hardware. Conventional methods which probe these states through direct measurements and classically computed correlations become comput...
Relating Measurement Patterns to Circuits via Pauli Flow
Will Simmons·Sep 13, 2021
The one-way model of Measurement-Based Quantum Computing and the gate-based circuit model give two different presentations of how quantum computation can be performed. There are known methods for converting any gate-based quantum circuit into a one-w...
Hybrid Quantum-Classical Circuit Simplification with the ZX-Calculus
Agustín Borgna, S. Perdrix, Benoît Valiron·Sep 13, 2021
We present a complete optimization procedure for hybrid quantum-classical circuits with classical parity logic. While common optimization techniques for quantum algorithms focus on rewriting solely the pure quantum segments, there is interest in appl...
Preparing exact eigenstates of the open XXZ chain on a quantum computer
J. V. Van Dyke, Edwin Barnes, S. Economou +1 more·Sep 12, 2021
The open spin-1/2 XXZ spin chain with diagonal boundary magnetic fields is the paradigmatic example of a quantum integrable model with open boundary conditions. We formulate a quantum algorithm for preparing Bethe states of this model, corresponding ...
Towards a variational Jordan–Lee–Preskill quantum algorithm
Junyu Liu, Zimu Li, Han Zheng +2 more·Sep 12, 2021
Rapid developments of quantum information technology show promising opportunities for simulating quantum field theory in near-term quantum devices. In this work, we formulate the theory of (time-dependent) variational quantum simulation of the 1+1 di...
ADAPT: Mitigating Idling Errors in Qubits via Adaptive Dynamical Decoupling
Poulami Das, Swamit S. Tannu, Siddharth Dangwal +1 more·Sep 11, 2021
The fidelity of applications on near-term quantum computers is limited by hardware errors. In addition to errors that occur during gate and measurement operations, a qubit is susceptible to idling errors, which occur when the qubit is idle and not ac...
Noise-Aware Quantum Amplitude Estimation
Steven Herbert, Ifan Williams, R. Guichard +1 more·Sep 10, 2021
In this article, based on some simple and reasonable assumptions, we derive a Gaussian noise model for quantum amplitude estimation. We provide results from quantum amplitude estimation run on various IBM superconducting quantum computers and on Quan...
Constructing Approximately Diagonal Quantum Gates
Colton Griffin, Shawn X. Cui·Sep 10, 2021
We study a method of producing approximately diagonal 1-qubit gates. For each positive integer, the method provides a sequence of gates that are defined iteratively from a fixed diagonal gate and an arbitrary gate. These sequences are conjectured to ...