Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Study of noise in virtual distillation circuits for quantum error mitigation
Pontus Vikstål, G. Ferrini, S. Puri·Oct 27, 2022
Virtual distillation has been proposed as an error mitigation protocol for estimating the expectation values of observables in quantum algorithms. It proceeds by creating a cyclic permutation of M noisy copies of a quantum state using a sequence of c...
Robust cryogenic matched low-pass coaxial filters for quantum computing applications
A. Samoylov, A. Ivanov, V. Echeistov +5 more·Oct 27, 2022
Electromagnetic noise is one of the key external factors decreasing superconducting qubits coherence. Matched coaxial filters can prevent microwave and IR photons negative influence on superconducting quantum circuits. Here, we report on design and f...
Automated error correction in superdense coding, with implementation on superconducting quantum computer
K. Nilesh, P. Joshi, P. Panigrahi·Oct 27, 2022
Construction of a fault-tolerant quantum computer remains a challenging problem due to unavoid-able noise in quantum states and the fragility of quantum entanglement. However, most of the error-correcting codes increases the complexity of the algorit...
An integrated microwave-to-optics interface for scalable quantum computing
M. Weaver, P. Duivestein, A. C. Bernasconi +7 more·Oct 27, 2022
Microwave-to-optics transduction is emerging as a vital technology for scaling quantum computers and quantum networks. To establish useful entanglement links between qubit processing units, several key conditions must be simultaneously met: the trans...
Broadband SNAIL parametric amplifier with microstrip impedance transformer
D. Ezenkova, D. Moskalev, N. Smirnov +8 more·Oct 27, 2022
Josephson parametric amplifiers are an important part of a modern superconducting quantum computing platform and squeezed quantum states generation devices. Traveling wave and impedance-matched parametric amplifiers provide broad bandwidth for high-f...
Universal robust quantum gates by geometric correspondence of noisy quantum evolution
Yong-Ju Hai, Junning Li, Junkai Zeng +2 more·Oct 26, 2022
A key to the next leap in quantum technologies and quantum computing relies on precise and robust control over noisy quantum systems. For the first time, our theory uncovers an essential correspondence between the driven noisy quantum evolution and m...
Virtual distillation with noise dilution
Yong-Siah Teo, Seongwook Shin, Hyukgun Kwon +2 more·Oct 26, 2022
Virtual distillation is an error-mitigation technique that reduces quantum-computation errors without assuming the noise type. In scenarios where the user of a quantum circuit is required to additionally employ peripherals, such as delay lines, that ...
Implementing arbitrary quantum operations via quantum walks on a cycle graph
Jia-Yi Lin, Xinyou Li, Yusheng Shao +2 more·Oct 26, 2022
The quantum circuit model is the most commonly used model for implementing quantum computers and quantum neural networks whose essential tasks are to realize certain unitary operations. Here we propose an alternative approach; we use a simple discret...
Entanglement Purification with Quantum LDPC Codes and Iterative Decoding
Narayanan Rengaswamy, Nithin Raveendran, Ankur Raina +1 more·Oct 25, 2022
Recent constructions of quantum low-density parity-check (QLDPC) codes provide optimal scaling of the number of logical qubits and the minimum distance in terms of the code length, thereby opening the door to fault-tolerant quantum systems with minim...
A Depolarizing Noise-aware Transpiler for Optimal Amplitude Amplification
Debashis Ganguly, Wonsun Ahn·Oct 25, 2022
Amplitude amplification provides a quadratic speed-up for an array of quantum algorithms when run on a quantum machine perfectly isolated from its environment. However, the advantage is substantially diminished as the NISQ-era quantum machines lack th...
Autonomous quantum error correction and fault-tolerant quantum computation with squeezed cat qubits
Qiang-Da Xu, G. Zheng, Yu-Xin Wang +3 more·Oct 24, 2022
We propose an autonomous quantum error correction scheme using squeezed cat (SC) code against excitation loss in continuous-variable systems. Through reservoir engineering, we show that a structured dissipation can stabilize a two-component SC while ...
Resource-efficient simulation of noisy quantum circuits and application to network-enabled QRAM optimization
Lu'is Bugalho, E. Z. Cruzeiro, Kevin C. Chen +3 more·Oct 24, 2022
Giovannetti, Lloyd, and Maccone (2008) proposed a quantum random access memory (QRAM) architecture to retrieve arbitrary superpositions of N (quantum) memory cells via quantum switches and $$O(\log (N))$$ O ( log ( N ) ) address qubits. Toward physic...
Electron charge qubit with 0.1 millisecond coherence time
Xianjing Zhou, Xinhao Li, Qianfan Chen +9 more·Oct 22, 2022
Electron charge qubits are compelling candidates for solid-state quantum computing because of their inherent simplicity in qubit design, fabrication, control and readout. However, electron charge qubits built on conventional semiconductors and superc...
Quantum algorithms for geologic fracture networks
Jessie M. Henderson, M. Podzorova, M. Cerezo +4 more·Oct 21, 2022
Solving large systems of equations is a challenge for modeling natural phenomena, such as simulating subsurface flow. To avoid systems that are intractable on current computers, it is often necessary to neglect information at small scales, an approac...
A quantum algorithm for solving open system dynamics on quantum computers using noise
J. Leppäkangas, N. Vogt, Keith R. Fratus +6 more·Oct 21, 2022
In this paper we present a quantum algorithm that uses noise as a resource. The goal of our quantum algorithm is the calculation of operator averages of an open quantum system evolving in time. Selected low-noise system qubits and noisy bath qubits r...
Noisy Tree Data Structures and Quantum Applications
K. Khadiev, N. Savelyev, M. Ziatdinov·Oct 20, 2022
We suggest a new technique for developing noisy tree data structures. We call it a “walking tree”. As applications of the technique we present a noisy Self-Balanced Binary Search Tree (we use a Red–Black tree as an implementation) and a noisy segment...
Describing Trotterized Time Evolutions on Noisy Quantum Computers via Static Effective Lindbladians
Keith R. Fratus, K. Bark, N. Vogt +4 more·Oct 20, 2022
We consider the extent to which a Trotterized time evolution implemented on a quantum computer is altered by the presence of decoherence. Given a specific set of assumptions regarding the manner in which noise processes acting on such a device can be...
Exponentially tighter bounds on limitations of quantum error mitigation
Yihui Quek, Daniel Stilck França, Sumeet Khatri +2 more·Oct 20, 2022
Quantum error mitigation has been proposed as a means to combat unwanted and unavoidable errors in near-term quantum computing without the heavy resource overheads required by fault-tolerant schemes. Recently, error mitigation has been successfully a...
Estimating the Jones polynomial for Ising anyons on noisy quantum computers
C. Self, S. Iblisdir, G. Brennen +1 more·Oct 20, 2022
The evaluation of the Jones polynomial at roots of unity is a paradigmatic problem for quantum computers. In this work we present experimental results obtained from existing noisy quantum computers for special cases of this problem, where it is class...
Sensitivity of quantum gate fidelity to laser phase and intensity noise
X. Jiang, J. Scott, M. Friesen +1 more·Oct 20, 2022
The fidelity of gate operations on neutral atom qubits is often limited by fluctuations of the laser drive. Here, we quantify the sensitivity of quantum gate fidelities to laser phase and intensity noise. We first develop models to identify features ...