Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Neural-network-assisted quantum state and process tomography using limited data sets
Akshay Gaikwad, Omkar Bihani, Arvind +1 more·Apr 9, 2023
In this study we employ a feed-forward artificial neural network (FFNN) architecture to perform tomography of quantum states and processes obtained from noisy experimental data. To evaluate the performance of the FFNN, we use a heavily reduced data s...
Electro-optically programmable photonic circuits enabled by wafer-scale integration on thin-film lithium niobate
Yong Zheng, Haozong Zhong, Haisu Zhang +10 more·Apr 7, 2023
Programmable photonic circuits performing universal linear-optical transformations underpin vital functions in photonic quantum information processing, quantum-enhanced sensor networks, machine learning and many other intriguing applications. Recent ...
A programmable true random number generator using commercial quantum computers
Aviraj Sinha, Elena R. Henderson, Jessie M. Henderson +2 more·Apr 7, 2023
Random number generators (RNG) are essential elements in many cryptographic systems. True random number generators (TRNG) rely upon sources of randomness from natural processes such as those arising from quantum mechanics phenomena. We demonstrate th...
On-Chip Generation and Collectively Coherent Control of the Superposition of the Whole Family of Dicke States.
Leizhen Chen, Liangliang Lu, Lijun Xia +3 more·Apr 7, 2023
Integrated quantum photonics has recently emerged as a powerful platform for generating, manipulating, and detecting entangled photons. Multipartite entangled states lie at the heart of the quantum physics and are the key enabling resources for scala...
Permutation invariant encodings for quantum machine learning with point cloud data
J. Heredge, C. Hill, L. Hollenberg +1 more·Apr 7, 2023
Quantum computing offers a potentially powerful new method for performing machine learning. However, several quantum machine learning techniques have been shown to exhibit poor generalisation as the number of qubits increases. We address this issue b...
Fourier expansion in variational quantum algorithms
Nikita A. Nemkov, E. Kiktenko, A. Fedorov·Apr 7, 2023
The Fourier expansion of the loss function in variational quantum algorithms (VQA) contains a wealth of information, yet is generally hard to access. We focus on the class of variational circuits, where constant gates are Clifford gates and parameter...
Quantum circuits for the Ising spin networks
Grzegorz Czelusta, J. Mielczarek·Apr 7, 2023
Spin network states are a powerful tool for constructing the $SU(2)$ gauge theories on a graph. In loop quantum gravity (LQG), they have yielded many promising predictions, although progress has been limited by the computational challenge of dealing ...
Loss-tolerant architecture for quantum computing with quantum emitters
M. C. Löbl, S. Paesani, A. Sørensen·Apr 7, 2023
We develop an architecture for measurement-based quantum computing using photonic quantum emitters. The architecture exploits spin-photon entanglement as resource states and standard Bell measurements of photons for fusing them into a large spin-qubi...
Automated quantum oracle synthesis with a minimal number of qubits
Jessie M. Henderson, Elena R. Henderson, Aviraj Sinha +2 more·Apr 7, 2023
Several prominent quantum computing algorithms—including Grover’s search algorithm and Shor’s algorithm for finding the prime factorization of an integer—employ subcircuits termed ‘oracles’ that embed a specific instance of a mathematical function in...
Duality between open systems and closed bilayer systems: Thermofield double states as quantum many-body scars
Alexander Teretenkov, Oleg Lychkovskiy·Apr 6, 2023
We establish a duality between open many-body systems governed by the Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) equation and satisfying the detailed balance condition on the one side, and closed bilayer systems with a self-adjoint Hamiltonian on t...
Exploration of Quantum Computer Power Side-Channels
Chuan Xu, Ferhat Erata, Jakub Szefer·Apr 6, 2023
With the rapidly growing interest in quantum computing also grows the importance of securing these quantum computers from various physical attacks. Constantly increasing qubit counts and improvements to the fidelity of the quantum computers hold grea...
Intermediate-qudit assisted Improved quantum algorithm for string matching with an Advanced Decomposition of Fredkin gate
A. Saha, Om Khanna·Apr 6, 2023
The circuit-level implementation of a quantum string-matching algorithm, which matches a search string (pattern) of length $M$ inside a longer text of length $N$, has already been demonstrated in the literature to outperform its classical counterpart...
Protecting information via probabilistic cellular automata.
A. Ray, R. Laflamme, Aleksander Kubica·Apr 6, 2023
Probabilistic cellular automata describe the dynamics of classical spin models, which, for sufficiently small temperature T, can serve as classical memory capable of storing information even in the presence of nonzero external magnetic field h. In th...
Parallel circuit implementation of variational quantum algorithms
Michele Cattelan, S. Yarkoni, Wolfgang Lechner·Apr 6, 2023
We present a framework to split quantum circuits of variational quantum algorithms (VQAs) to allow for parallel training and execution to solve problems larger than the number of available qubits in a quantum device. We apply this method to combinato...
Performance Bounds for Quantum Feedback Control
Flemming Holtorf, F. Schäfer, Julian Arnold +2 more·Apr 6, 2023
The limits of quantum feedback control have immediate consequences for quantum information science at large, yet remain largely unexplored. Here, we combine quantum filtering theory and moment-sum-of-squares techniques to construct a hierarchy of con...
Detecting quantum critical points at finite temperature via quantum teleportation
G. Ribeiro, G. Rigolin·Apr 5, 2023
We show that the quantum teleportation protocol is a powerful tool to study quantum phase transitions (QPTs) at finite temperatures. We consider a pair of spins from an infinite spin-1/2 chain (XXZ model) in equilibrium with a reservoir at temperatur...
Quantum and Classical Spin-Network Algorithms for q-Deformed Kogut-Susskind Gauge Theories.
T. Zache, D. González-Cuadra, P. Zoller·Apr 5, 2023
Treating the infinite-dimensional Hilbert space of non-Abelian gauge theories is an outstanding challenge for classical and quantum simulations. Here, we employ q-deformed Kogut-Susskind lattice gauge theories, obtained by deforming the defining symm...
Verifying Quantum Phase Estimation (QPE) using Prove-It
W. Witzel, Warren D. Craft, R. Carr +1 more·Apr 5, 2023
The general-purpose interactive theorem-proving assistant called Prove-It was used to verify the Quantum Phase Estimation (QPE) algorithm, specifically claims about its outcome probabilities. Prove-It is unique in its ability to express sophisticated...
Low-dissipation data bus via coherent quantum dynamics
Dylan Lewis, João P. Moutinho, A. Costa +2 more·Apr 5, 2023
The transfer of information between two physical locations is an essential component of both classical and quantum computing. In quantum computing the transfer of information must be coherent to preserve quantum states and hence the quantum informati...
Quantum approximation optimization algorithm for the trellis-based viterbi decoding of classical error-correcting codes
Mainak Bhattacharyya, Ankur Raina·Apr 5, 2023
We construct a hybrid quantum–classical Viterbi decoder for the classical error-correcting codes. Viterbi decoding is a trellis-based procedure for maximum likelihood decoding of classical error-correcting codes. In this article, we demonstrate that ...