Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Efficient Decoding of Surface Code Syndromes for Error Correction in Quantum Computing
Debasmita Bhoumik, Pinaki Sen, Ritajit Majumdar +3 more·Oct 21, 2021
Errors in surface code have typically been decoded by Minimum Weight Perfect Matching (MWPM) based method. Recently, neural-network-based Machine Learning (ML) techniques have been employed for this purpose. Here we propose a two-level (low and high)...
Machine learning for continuous quantum error correction on superconducting qubits
Ian Convy, Haoran Liao, Song Zhang +5 more·Oct 20, 2021
Continuous quantum error correction has been found to have certain advantages over discrete quantum error correction, such as a reduction in hardware resources and the elimination of error mechanisms introduced by having entangling gates and ancilla ...
Simulability transitions in continuous-time dynamics of local open quantum systems
Rahul Trivedi, J. Cirac·Oct 20, 2021
We analyze the complexity of classically simulating continuous-time dynamics of locally interacting quantum spin systems with a constant rate of entanglement breaking noise. We prove that a polynomial time classical algorithm can be used to sample fr...
A Logarithmic Bayesian Approach to Quantum Error Detection
Ian Convy, K. B. Whaley·Oct 20, 2021
We consider the problem of continuous quantum error correction from a Bayesian perspective, proposing a pair of digital filters using logarithmic probabilities that are able to achieve near-optimal performance on a three-qubit bit-flip code, while st...
Quantum face recognition protocol with ghost imaging
V. Salari, Dilip Paneru, E. Saglamyurek +6 more·Oct 19, 2021
Face recognition is one of the most ubiquitous examples of pattern recognition in machine learning, with numerous applications in security, access control, and law enforcement, among many others. Pattern recognition with classical algorithms requires...
Toward reliability in the NISQ era: Robust interval guarantee for quantum measurements on approximate states
Maurice Weber, A. Anand, Alba Cervera-Lierta +6 more·Oct 19, 2021
Near-term quantum computation holds potential across multiple application domains. However, imperfect preparation and evolution of states due to algorithmic and experimental shortcomings, characteristic in the near-term implementation, would typicall...
Graph-theoretic approach to quantum error correction
Robert Vandermolen, D. Wright·Oct 16, 2021
We investigate a novel class of quantum error correcting codes to correct errors on both qubits and higher-state quantum systems represented as qudits. These codes arise from an original graph-theoretic representation of sets of quantum errors. In th...
FPGA-based electronic system for the control and readout of superconducting quantum processors.
Yuchen Yang, Z. Shen, Xing Zhu +6 more·Oct 15, 2021
Electronic systems for qubit control and measurement serve as a bridge between quantum programming language and quantum information processors. With the rapid development of superconducting quantum circuit technology, synchronization in a large-scale...
Performance of a Kinetic Inductance Traveling-Wave Parametric Amplifier at 4 Kelvin: Toward an Alternative to Semiconductor Amplifiers.
M. Malnou, J. Aumentado, M. Vissers +4 more·Oct 15, 2021
Most microwave readout architectures in quantum computing or sensing rely on a semiconductor amplifier at 4 K, typically a high-electron mobility transistor (HEMT). Despite its remarkable noise performance, a conventional HEMT dissipates several mill...
A Theory of Quantum Subspace Diagonalization
Ethan N. Epperly, Lin Lin, Y. Nakatsukasa·Oct 14, 2021
Quantum subspace diagonalization methods are an exciting new class of algorithms for solving large\rev{-}scale eigenvalue problems using quantum computers. Unfortunately, these methods require the solution of an ill-conditioned generalized eigenvalue...
Observability of fidelity decay at the Lyapunov rate in few-qubit quantum simulations
M. D. Porter, I. Joseph·Oct 14, 2021
In certain regimes, the fidelity of quantum states will decay at a rate set by the classical Lyapunov exponent. This serves both as one of the most important examples of the quantum-classical correspondence principle and as an accurate test for the p...
Large scale multi-node simulations of $\mathbb{Z}_2$ gauge theory quantum circuits using Google Cloud Platform
Erik J. Gustafson, B. Holzman, J. Kowalkowski +14 more·Oct 14, 2021
Simulating quantum field theories on a quantum computer is one of the most exciting fundamental physics applications of quantum information science. Dynamical time evolution of quantum fields is a challenge that is beyond the capabilities of classica...
Characterizing Quantum Instruments: From Nondemolition Measurements to Quantum Error Correction
R. Stricker, D. Vodola, A. Erhard +7 more·Oct 13, 2021
In quantum information processing quantum operations are often processed alongside measurements which result in classical data. Due to the information gain of classical measurement outputs non-unitary dynamical processes can take place on the system,...
New construction of nine-qubit error-correcting code
Long Huang, Xiaohua Wu·Oct 11, 2021
We report new construction of nine-qubit error-correcting code, which introduces two new nine-qubit codes and one new three-qubit code. Because both the new two nine-qubit codes have the normal logical operators, as opposed to the nine-qubit Shor cod...
Depth Optimized Ansatz Circuit in QAOA for Max-Cut
Ritajit Majumdar, Debasmita Bhoumik, Dhiraj Madan +3 more·Oct 9, 2021
While a Quantum Approximate Optimization Algorithm (QAOA) is intended to provide a quantum advantage in finding approximate solutions to combinatorial optimization problems, noise in the system is a hurdle in exploiting its full potential. Several er...
Qubit-efficient encoding scheme for quantum simulations of electronic structure
Yu Shee, Pei-Kai Tsai, Chengyun Hong +2 more·Oct 8, 2021
Simulating electronic structure on a quantum computer requires encoding of fermionic systems onto qubits. Common encoding methods transform a fermionic system of $N$ spin-orbitals into an $N$-qubit system, but many of the fermionic configurations do ...
Noisy quantum amplitude estimation without noise estimation
Tomoki Tanaka, Shumpei Uno, Tamiya Onodera +2 more·Oct 8, 2021
Many quantum algorithms contain an important subroutine, the quantum amplitude estimation. As the name implies, this is essentially the parameter estimation problem and thus can be handled via the established statistical estimation theory. However, t...
A Cutting-plane Method for Semidefinite Programming with Potential Applications on Noisy Quantum Devices
Jakub Marecek, A. Akhriev·Oct 7, 2021
There is an increasing interest in quantum algorithms for optimization problems. Within convex optimization, interior-point methods and other recently proposed quantum algorithms are non-trivial to implement on noisy quantum devices. Here, we discuss...
Large-bandwidth Transduction Between an Optical Single Quantum Dot Molecule and a Superconducting Resonator
Yuta Tsuchimoto, Zhe Sun, E. Togan +6 more·Oct 7, 2021
Quantum transduction between the microwave and optical domains is an outstanding challenge for long-distance quantum networks based on superconducting qubits. For all transducers realized to date, the generally weak light-matter coupling does not all...
Variational Determination of Multiqubit Geometrical Entanglement in Noisy Intermediate-Scale Quantum Computers
A. Muñoz-Moller, L. Pereira, L. Zambrano +2 more·Oct 7, 2021
Current noise levels in physical realizations of qubits and quantum operations limit the applicability of conventional methods to characterize entanglement. In this adverse scenario, we follow a quantum variational approach to estimate the geometric ...