Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Practical limits of error correction for quantum metrology
Nathan Shettell, W. Munro, D. Markham +1 more·Jan 8, 2021
Noise is the greatest obstacle in quantum metrology that limits it achievable precision and sensitivity. There are many techniques to mitigate the effect of noise, but this can never be done completely. One commonly proposed technique is to repeatedl...
Modeling and mitigation of cross-talk effects in readout noise with applications to the Quantum Approximate Optimization Algorithm
Filip B. Maciejewski, F. Baccari, Z. Zimbor'as +1 more·Jan 7, 2021
Measurement noise is one of the main sources of errors in currently available quantum devices based on superconducting qubits. At the same time, the complexity of its characterization and mitigation often exhibits exponential scaling with the system ...
Modeling and simulating the noisy behavior of near-term quantum computers
K. Georgopoulos, C. Emary, P. Zuliani·Jan 6, 2021
Noise dominates every aspect of near-term quantum computers, rendering it exceedingly difficult to carry out even small computations. In this paper we are concerned with the modelling of noise in Noisy Intermediate-Scale Quantum (NISQ) computers. We ...
Meissner levitation of a permanent magnet within a superconducting radio frequency cavity
N. K. Raut, Jeffery Miller, R. Chiao +1 more·Jan 5, 2021
We report the first experimental demonstration of Meissner-effect levitation of a millimeter-scale neodymium magnet within a cm-scale superconducting aluminum coaxial quarter-wave stub cavity. The coaxial mode's resonance frequency shifts as a functi...
Berry phase induced entanglement of hole-spin qubits in a microwave cavity
M. Wysoki'nski, M. Plodzie'n, M. Trif·Dec 31, 2020
Hole-spins localized in semiconductor structures, such as quantum dots or defects, serve to the realization of efficient gate-tunable solid-state quantum bits. Here we study two electrically driven spin 3/2 holes coupled to the electromagnetic field ...
Entanglement devised barren plateau mitigation
T. Patti, K. Najafi, Xun Gao +1 more·Dec 23, 2020
Hybrid quantum-classical variational algorithms are one of the most propitious implementations of quantum computing on near-term devices, offering classical machine learning support to quantum scale solution spaces. However, numerous studies have dem...
Phase-space methods for representing, manipulating, and correcting Gottesman-Kitaev-Preskill qubits
Lucas J. Mensen, B. Baragiola, N. Menicucci·Dec 23, 2020
The Gottesman-Kitaev-Preskill (GKP) encoding of a qubit into a bosonic mode is a promising bosonic code for quantum computation due to its tolerance for noise and all-Gaussian gate set. We present a toolkit for phase-space description and manipulatio...
Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions
Pedro Parrado-Rodríguez, C. Ryan-Anderson, A. Bermudez +1 more·Dec 21, 2020
Physical qubits in experimental quantum information processors are inevitably exposed to different sources of noise and imperfections, which lead to errors that typically accumulate hindering our ability to perform long computations reliably. Progres...
QGo: Scalable Quantum Circuit Optimization Using Automated Synthesis
Xin-Chuan Wu, M. Davis, F. Chong +1 more·Dec 17, 2020
—The current phase of quantum computing is in the Noisy Intermediate-Scale Quantum (NISQ) era. On NISQ devices, two-qubit gates such as CNOTs are much noisier than single-qubit gates, so it is essential to minimize their count. Quantum circuit synthe...
A reset-if-leaked procedure for encoded spin qubits
Veit Langrock, D. DiVincenzo·Dec 17, 2020
We report a substantially simplified procedure, based on group-theoretic reasoning, for the reduction of qubit leakage in exchange-only spin qubits. We to find exchange sequences which accomplish leakage reduction with only two additional spins and w...
Dynamically Corrected Nonadiabatic Holonomic Quantum Gates
Sai Li, Z. Xue·Dec 16, 2020
The key for realizing fault-tolerant quantum computation lies in maintaining the coherence of all the qubits so that high-fidelity and robust qubit manipulations can be achievable. One of the promising approaches is to use geometric phases in the con...
Programmable Quantum Annealers as Noisy Gibbs Samplers
Marc Vuffray, Carleton Coffrin, Y. Kharkov +1 more·Dec 16, 2020
Drawing independent samples from high-dimensional probability distributions represents the major computational bottleneck for modern algorithms, including powerful machine learning frameworks such as deep learning. The quest for discovering larger fa...
Variational quantum algorithms
M. Cerezo, A. Arrasmith, R. Babbush +8 more·Dec 16, 2020
Applications such as simulating complicated quantum systems or solving large-scale linear algebra problems are very challenging for classical computers, owing to the extremely high computational cost. Quantum computers promise a solution, although fa...
Noise-Assisted Quantum Autoencoder
Chenfeng Cao, Xin Wang·Dec 15, 2020
Quantum autoencoder is an efficient variational quantum algorithm for quantum data compression. However, previous quantum autoencoders fail to compress and recover high-rank mixed states. In this work, we discuss the fundamental properties and limita...
High-fidelity superconducting quantum processors via laser-annealing of transmon qubits
E. Zhang, S. Srinivasan, N. Sundaresan +19 more·Dec 15, 2020
Scaling the number of qubits while maintaining high-fidelity quantum gates remains a key challenge for quantum computing. Presently, superconducting quantum processors with >50-qubits are actively available. For such systems, fixed-frequency transmon...
Relaxation times do not capture logical qubit dynamics
A. Pal, P. Schindler, A. Erhard +5 more·Dec 14, 2020
Quantum error correction procedures have the potential to enable faithful operation of large-scale quantum computers. They protect information from environmental decoherence by storing it in logical qubits, built from ensembles of entangled physical ...
Analyzing the performance of variational quantum factoring on a superconducting quantum processor
A. Karamlou, W. Simon, Amara Katabarwa +3 more·Dec 14, 2020
In the near-term, hybrid quantum-classical algorithms hold great potential for outperforming classical approaches. Understanding how these two computing paradigms work in tandem is critical for identifying areas where such hybrid algorithms could pro...
Relaxed Peephole Optimization: A Novel Compiler Optimization for Quantum Circuits
Ji Liu, Luciano Bello, Huiyang Zhou·Dec 14, 2020
As in classical computing, compilers play an important role in quantum computing. Quantum processors typically support a limited set of primitive operations or quantum gates and have certain hardware-related limitations. A quantum compiler is respons...
Efficient entanglement generation and detection of generalized stabilizer states
Yihong Zhang, Yifan Tang, You Zhou +1 more·Dec 14, 2020
The generation and verification of large-scale entanglement are essential to the development of quantum technologies. In this work, we present an efficient scheme to generate genuine multipartite entanglement of a large number of qubits, by using the...
Variational quantum algorithm for the Poisson equation
Hailing Liu, Yusen Wu, Lin-Chun Wan +4 more·Dec 13, 2020
The Poisson equation has wide applications in many areas of science and engineering. Although there are some quantum algorithms that can efficiently solve the Poisson equation, they generally require a fault-tolerant quantum computer which is beyond ...