Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Robustness of quantum reinforcement learning under hardware errors
Andrea Skolik, Stefano Mangini, Thomas Bäck +2 more·Dec 19, 2022
Variational quantum machine learning algorithms have become the focus of recent research on how to utilize near-term quantum devices for machine learning tasks. They are considered suitable for this as the circuits that are run can be tailored to the...
Controlling photon polarisation with a single quantum dot spin
E. Mehdi, Manuel Gundin-Martinez, C. Millet +9 more·Dec 7, 2022
In the framework of optical quantum computing and communications, a major objective consists in building receiving nodes that implement conditional operations on incoming photons, using the interaction with a single stationary qubit. In particular, t...
Universal Kardar-Parisi-Zhang scaling in noisy hybrid quantum circuits
Shuo Liu, Ming-Rui Li, Shi-Xin Zhang +2 more·Dec 7, 2022
Measurement-induced phase transitions (MIPT) have attracted increasing attention due to the rich phenomenology of entanglement structures and their relation with quantum information processing. Since physical systems are unavoidably coupled to enviro...
Acceptor-based qubit in silicon with tunable strain
Shihang Zhang, Yu He, Peihao Huang·Nov 18, 2022
Long coherence time and compatibility with semiconductor fabrication make spin qubits in silicon an attractive platform for quantum computing. In recent years, hole spin qubits are being developed as they have the advantages of weak coupling to nucle...
Tuning for Quantum Speedup in Directed Lackadaisical Quantum Walks
Pranay Naredi, J. Kannan, M. S. Santhanam·Nov 11, 2022
Quantum walks constitute an important tool for designing quantum algorithms and information processing tasks. In a lackadaisical walk, in addition to the possibility of moving out of a node, the walker can remain on the same node with some probabilit...
Entanglement steering in adaptive circuits with feedback
V. Ravindranath, Yi-Fan Han, Zhi-Cheng Yang +1 more·Nov 9, 2022
The intensely studied measurement-induced entanglement phase transition has become a hallmark of non-unitary quantum many-body dynamics. Usually, such a transition only shows up at the level of each individual quantum trajectory, and is absent for th...
A Polynomial-Time Classical Algorithm for Noisy Random Circuit Sampling
D. Aharonov, Xun Gao, Zeph Landau +2 more·Nov 8, 2022
We give a polynomial time classical algorithm for sampling from the output distribution of a noisy random quantum circuit in the regime of anti-concentration to within inverse polynomial total variation distance. The algorithm is based on a quantum a...
Pulse-efficient quantum machine learning
A. Melo, Nathan Earnest-Noble, F. Tacchino·Nov 2, 2022
Quantum machine learning algorithms based on parameterized quantum circuits are promising candidates for near-term quantum advantage. Although these algorithms are compatible with the current generation of quantum processors, device noise limits thei...
Faster variational quantum algorithms with quantum kernel-based surrogate models
Alistair W. R. Smith, A. Paige, Myungshik S. Kim·Nov 2, 2022
We present a new optimization strategy for small-to-intermediate scale variational quantum algorithms (VQAs) on noisy near-term quantum processors which uses a Gaussian process surrogate model equipped with a classically-evaluated quantum kernel. VQA...
Operational Metric for Quantum Chaos and the Corresponding Spatiotemporal-Entanglement Structure
Neil Dowling, K. Modi·Oct 26, 2022
Chaotic systems are highly sensitive to a small perturbation, and are ubiquitous throughout biological sciences, physical sciences and even social sciences. Taking this as the underlying principle, we construct an operational notion for quantum chaos...
Theory of strong down-conversion in multi-mode cavity and circuit QED
N. Mehta, C. Ciuti, R. Kuzmin +1 more·Oct 26, 2022
We revisit the superstrong coupling regime of multi-mode cavity quantum electrodynamics (QED), defined to occur when the frequency of vacuum Rabi oscillations between the qubit and the nearest cavity mode exceeds the cavity's free spectral range. A n...
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...
Simulating dirty bosons on a quantum computer
Lindsay Bassman Oftelie, Roel Van Beeumen, Daan Camps +2 more·Oct 15, 2022
Quantum computers hold the potential to unlock new discoveries in complex quantum systems by enabling the simulation of physical systems that have heretofore been impossible to implement on classical computers due to intractability. A system of parti...
Measurement-Induced Phase Transitions on Dynamical Quantum Trees
Xiao-Min Feng, B. Skinner, A. Nahum·Oct 13, 2022
Monitored many-body systems fall broadly into two dynamical phases, ``entangling'' or ``disentangling'', separated by a transition as a function of the rate at which measurements are made on the system. Producing an analytical theory of this measurem...
Ab-initio tree-tensor-network digital twin for quantum computer benchmarking in 2D
Daniel Jaschke, A. Pagano, S. Weber +1 more·Oct 7, 2022
Large-scale numerical simulations of the Hamiltonian dynamics of a noisy intermediate scale quantum computer—a digital twin—could play a major role in developing efficient and scalable strategies for tuning quantum algorithms for specific hardware. V...
Universal anomaly of dynamics at phase transition points induced by Pancharatnam-Berry phase
Jiayan Zhang, X. Yin, Mingyu Liu +3 more·Sep 29, 2022
Dynamical anomalies are often observed near both the continuous and first-order phase transition points. We propose that the universal anomalies could originate from the geometric phase effects. A Pancharatnam-Berry phase is accumulated continuously ...
Phonon Induced Spin Dephasing Time of Nitrogen Vacancy Centers in Diamond from First Principles
J. Simoni, V. Ivanov, T. Schenkel +1 more·Sep 23, 2022
Spin qubits with long dephasing times are an essential requirement for the development of new quantum technologies and have many potential applica-tions ranging from quantum information processing to quantum memories and quantum networking. Here we r...
Beyond Heisenberg Limit Quantum Metrology through Quantum Signal Processing
Yulong Dong, J. Gross, M. Niu·Sep 22, 2022
Leveraging quantum effects in metrology such as entanglement and coherence allows one to measure parameters with enhanced sensitivity [11]. However, time-dependent noise can disrupt such Heisenberg-limited amplification. We propose a quantum-metrolog...
Quantum mixed state compiling
Nic Ezzell, E. Ball, Aliza U. Siddiqui +4 more·Sep 1, 2022
The task of learning a quantum circuit to prepare a given mixed state is a fundamental quantum subroutine. We present a variational quantum algorithm (VQA) to learn mixed states which is suitable for near-term hardware. Our algorithm represents a gen...
Solvable model of deep thermalization with distinct design times
Matteo Ippoliti, W. Ho·Aug 22, 2022
We study the emergence over time of a universal, uniform distribution of quantum states supported on a finite subsystem, induced by projectively measuring the rest of the system. Dubbed deep thermalization, this phenomenon represents a form of equili...