Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
GRAPE optimization for open quantum systems with time-dependent decoherence rates driven by coherent and incoherent controls
V. Petruhanov, A. Pechen·Jul 11, 2023
The GRadient Ascent Pulse Engineering (GRAPE) method is widely used for optimization in quantum control. GRAPE is gradient search method based on exact expressions for gradient of the control objective. It has been applied to various coherently contr...
A Model for Circuit Execution Runtime And Its Implications for Quantum Kernels At Practical Data Set Sizes
Travis L. Scholten, Derrick Perry, Joseph E. Washington +2 more·Jul 11, 2023
Quantum machine learning (QML) is a fast-growing discipline within quantum computing. One popular QML algorithm, quantum kernel estimation, uses quantum circuits to estimate a similarity measure (kernel) between two classical feature vectors. Given a...
Robust design under uncertainty in quantum error mitigation
Maksym Prodius, Piotr Czarnik, Michael McKerns +2 more·Jul 11, 2023
Error mitigation techniques are crucial to achieving near-term quantum advantage. Classical post-processing of quantum computation outcomes is a popular approach for error mitigation, which includes methods such as Zero Noise Extrapolation, Virtual D...
Precise image generation on current noisy quantum computing devices
F. Rehm, S. Vallecorsa, K. Borras +3 more·Jul 11, 2023
The quantum angle generator (QAG) is a new full quantum machine learning model designed to generate accurate images on current noise intermediate scale quantum devices. Variational quantum circuits form the core of the QAG model, and various circuit ...
Large‐Scale On‐Chip Integration of Gate‐Voltage Addressable Hybrid Superconductor–Semiconductor Quantum Wells Field Effect Nano‐Switch Arrays
K. Delfanazari, Jiahui Li, P. Ma +10 more·Jul 10, 2023
Stable, reproducible, scalable, addressable, and controllable hybrid superconductor–semiconductor (S–Sm) junctions and switches are key circuit elements and building blocks of gate‐based quantum processors. The electrostatic field effect produced by ...
Quantum dots for quantum information technology
T. Heindel, Jehyung Kim, N. Gregersen +2 more·Jul 10, 2023
The generation, manipulation, storage, and detection of single photons play a central role in emerging photonic quantum information technology. Individual photons serve as flying qubits and transmit the quantum information at high speed and with low ...
Reliable Devices Yield Stable Quantum Computations
S. Dasgupta, T. Humble·Jul 10, 2023
Stable quantum computation requires noisy results to remain bounded even in the presence of noise fluctuations. Yet non-stationary noise processes lead to drift in the varying characteristics of a quantum device that can greatly influence the circuit...
Quantum Zeno effect: a qutrit controlled by a qubit
K. Kumari, G. Rajpoot, S. Jain·Jul 10, 2023
For a three-level system monitored by an ancilla, we show that quantum Zeno effect can be employed to control quantum jump for error correction. Further, we show that we can realize cNOT gate, and effect dense coding and teleportation. We believe tha...
Spin-EPR-pair separation by conveyor-mode single electron shuttling in Si/SiGe
Tom Struck, Mats Volmer, L. Visser +7 more·Jul 10, 2023
Long-ranged coherent qubit coupling is a missing function block for scaling up spin qubit based quantum computing solutions. Spin-coherent conveyor-mode electron-shuttling could enable spin quantum-chips with scalable and sparse qubit-architecture. I...
Quantum error correction beyond the toric code: dynamical systems meet encoding
G. Rajpoot, K. Kumari, S. Jain·Jul 10, 2023
We construct surface codes corresponding to genus greater than one in the context of quantum error correction. The architecture is inspired by the topology of invariant integral surfaces of certain non-integrable classical billiards. Corresponding to...
The Electronic Structure of the Hydrogen Molecule: A Tutorial Exercise in Classical and Quantum Computation
V. Graves, Christoph Sünderhauf, N. S. Blunt +2 more·Jul 9, 2023
In this educational paper, we will discuss calculations on the hydrogen molecule on both classical and quantum computers. In the former case, we will discuss the calculation of molecular integrals that can then be used to calculate potential energy c...
Phase transitions in sampling and error correction in local Brownian circuits
S. Sahu, Shao-Kai Jian·Jul 9, 2023
We study the emergence of anticoncentration and approximate unitary design behavior in local Brownian circuits. The dynamics of circuit averaged moments of the probability distribution and entropies of the output state can be represented as imaginary...
Quantum techniques for eigenvalue problems
Dean Lee·Jul 8, 2023
This article is a brief introduction to quantum algorithms for the eigenvalue problem in quantum many-body systems. Rather than a broad survey of topics, we focus on providing a conceptual understanding of several quantum algorithms that cover the es...
Noisy Tensor Ring approximation for computing gradients of Variational Quantum Eigensolver for Combinatorial Optimization
Dheeraj Peddireddy, Utkarsh Priyam, V. Aggarwal·Jul 8, 2023
Variational Quantum algorithms, especially Quantum Approximate Optimization and Variational Quantum Eigensolver (VQE) have established their potential to provide computational advantage in the realm of combinatorial optimization. However, these algor...
Enhancing the efficiency of quantum-dot-based single-photon source designs by suppressing background emission using concentric rings
Martin Arentoft Jacobsen, Luca Vannucci, Julien Claudon +2 more·Jul 7, 2023
In this paper, we theoretically demonstrate that a few-period circular Bragg reflector consisting of concentric rings placed around an infinite nanowire with an embedded quantum dot can increase the fraction of radiative emission into the fundamental...
Path-integral simulation of exchange interactions in CMOS spin qubits
J. D. Cifuentes, Philip Y. Mai, Fr'ed'eric Schlattner +5 more·Jul 7, 2023
The boom of semiconductor quantum computing platforms created a demand for computer-aided design and fabrication of quantum devices. Path integral Monte Carlo (PIMC) can have an important role in this effort because it intrinsically integrates strong...
Error-tolerant quantum convolutional neural networks for symmetry-protected topological phases
Petr Zapletal, Nathan A. McMahon, M. Hartmann·Jul 7, 2023
The analysis of noisy quantum states prepared on current quantum computers is getting beyond the capabilities of classical computing. Quantum neural networks based on parametrized quantum circuits, measurements and feed-forward can process large amou...
Experimental quantum natural gradient optimization in photonics
Yizhi Wang, Shichuan Xue, Yaxuan Wang +10 more·Jul 7, 2023
Variational quantum algorithms (VQAs) combining the advantages of parameterized quantum circuits and classical optimizers, promise practical quantum applications in the noisy intermediate-scale quantum era. The performance of VQAs heavily depends on ...
Experimental demonstration of a high-fidelity virtual two-qubit gate
Akhil Pratap Singh, K. Mitarai, Yasunari Suzuki +4 more·Jul 6, 2023
We experimentally demonstrate a virtual two-qubit gate and characterize it using quantum process tomography~(QPT). The virtual two-qubit gate decomposes an actual two-qubit gate into single-qubit unitary gates and projection gates in quantum circuits...
Adaptive projected variational quantum dynamics
David Linteau, Stefano Barison, N. Lindner +1 more·Jul 6, 2023
We propose an adaptive quantum algorithm to prepare accurate variational time evolved wave functions. The method is based on the projected Variational Quantum Dynamics (pVQD) algorithm, that performs a global optimization with linear scaling in the n...