Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Driven multiphoton qubit-resonator interactions
M. Ayyash, Xicheng Xu, S. Ashhab +1 more·May 2, 2024
We develop a general theory for multiphoton qubit-resonator interactions enhanced by a qubit drive. The interactions generate qubit-conditional operations in the resonator when the driving is near $n$-photon cross-resonance, namely, the qubit drive i...
Quantum Repeater Protocol using Quantum Error Correction for Distillation
Ashlesha Patil, Michele Pacenti, Bane Vasić +2 more·May 1, 2024
Bell-state measurement (BSM) on entangled states shared between quantum repeaters is the fundamental operation used to route entanglement in quantum networks. Performing BSMs on Werner states shared between repeaters leads to exponential decay in the...
Classically Spoofing System Linear Cross Entropy Score Benchmarking
Andrew Tanggara, Mile Gu, Kishor Bharti·May 1, 2024
In recent years, several experimental groups have claimed demonstrations of ``quantum supremacy'' or computational quantum advantage. A notable first claim by Google Quantum AI revolves around a metric called the Linear Cross Entropy Benchmarking (Li...
Entanglement and fidelity across quantum phase transitions in locally perturbed topological codes with open boundaries
Harikrishnan K J, Amit Kumar Pal·May 1, 2024
We investigate the topological-to-non-topological quantum phase transitions (QPTs) occurring in the Kitaev code under local perturbations in the form of local magnetic field and spin-spin interactions of the Ising-type using fidelity susceptibility (...
Schwinger–Keldysh nonperturbative field theory of open quantum systems beyond the Markovian regime: application to spin-boson and spin-chain-boson models
Felipe Reyes-Osorio, Federico García-Gaitán, David J Strachan +3 more·May 1, 2024
We develop a unified framework for open quantum systems composed of many mutually interacting quantum spins, or any isomorphic systems like qubits and qudits, surrounded by one or more independent bosonic baths. Our framework, based on Schwinger–Keld...
SHARE: Secure Hardware Allocation and Resource Efficiency in Quantum Systems
S. Upadhyay, Swaroop Ghosh·May 1, 2024
Quantum computing (QC) is poised to revolutionize problem-solving across various fields, with research suggesting that systems with over 50 qubits may achieve quantum advantage-surpassing supercomputers in certain optimization tasks. As the hardware ...
An RNN–policy gradient approach for quantum architecture search
Gang Wang, Banghai Wang, Shao-Ming Fei·May 1, 2024
Variational quantum circuits are one of the promising ways to exploit the advantages of quantum computing in the noisy intermediate-scale quantum technology era. The design of the quantum circuit architecture might greatly affect the performance capa...
Quantum algorithms for N-1 security in power grids
Niels M. P. Neumann, Stan van der Linde, Willem de Kok +7 more·May 1, 2024
In recent years, the supply and demand of electricity has significantly increased. As a result, the interconnecting grid infrastructure has required (and will continue to require) further expansion, while allowing for rapid resolution of unforeseen f...
Control landscapes for high-fidelity generation of C-NOT and C-PHASE gates with coherent and environmental driving
A. Pechen, V. Petruhanov, O. Morzhin +1 more·May 1, 2024
High-fidelity generation of two-qubit gates is important for quantum computation, since such gates are components of popular universal sets of gates. Here, we consider the problem of high-fidelity generation of two-qubit C-NOT and C-PHASE (with a det...
A synthetic magnetic vector potential in a 2D superconducting qubit array
Ilan T. Rosen, Sarah E. Muschinske, Cora N. Barrett +14 more·May 1, 2024
Superconducting quantum processors are a compelling platform for analogue quantum simulation due to the precision control, fast operation and site-resolved readout inherent to the hardware. Arrays of coupled superconducting qubits natively emulate th...
QUACK: Quantum Aligned Centroid Kernel
Kilian Tscharke, Sebastian Issel, P. Debus·May 1, 2024
Quantum computing (QC) seems to show potential for application in machine learning (ML). In particular quantum kernel methods (QKM) exhibit promising properties for use in supervised ML tasks. However, a major disadvantage of kernel methods is their ...
Barren plateaus in variational quantum computing
Martín Larocca, Supanut Thanasilp, Samson Wang +7 more·May 1, 2024
Variational quantum computing offers a flexible computational approach with a broad range of applications. However, a key obstacle to realizing their potential is the barren plateau (BP) phenomenon. When a model exhibits a BP, its parameter optimizat...
Scaling Up the Quantum Divide and Conquer Algorithm for Combinatorial Optimization
I. Cameron, T. Tomesh, Zain Saleem +1 more·May 1, 2024
Quantum optimization as a field has largely been restricted by the constraints of current quantum computing hardware, as limitations on size, performance, and fidelity mean most non-trivial problem instances won't fit on quantum devices. Even propose...
What is Quantum Parallelism, Anyhow?
Stefano Markidis·May 1, 2024
Central to the power of quantum computing is the concept of quantum parallelism: quantum systems can explore and process multiple computational paths simultaneously. In this paper, we discuss the elusive nature of quantum parallelism, drawing paralle...
High-dimensional graphs convolution for quantum walks photonic applications
Roman Abramov, Leonid Fedichkin, Dmitry V. Tsarev +1 more·May 1, 2024
Quantum random walks represent a powerful tool for the implementation of various quantum algorithms. We consider a convolution problem for the graphs which provide quantum and classical random walks. We suggest a new method for lattices and hypercycl...
Linearly simplified QAOA parameters and transferability
R. Sakai, Hiromichi Matsuyama, Wai-Hong Tam +2 more·May 1, 2024
Quantum Approximate Optimization Algorithm (QAOA) provides a way to solve combinatorial optimization problems using quantum computers. QAOA circuits consist of time evolution operators by the cost Hamiltonian and of state mixing operators, and embedd...
Experimental aspects of indefinite causal order in quantum mechanics
L. Rozema, T. Strömberg, Huan Cao +3 more·May 1, 2024
In the past decade, the toolkit of quantum information has been expanded to include processes in which the basic operations do not have definite causal relations. Originally considered in the context of the unification of quantum mechanics and genera...
Quantum thermodynamics of the Caldeira-Leggett model with non-equilibrium Gaussian reservoirs
Vasco Cavina, Massimiliano Esposito·Apr 30, 2024
We introduce a non-equilibrium version of the Caldeira-Leggett model in which a quantum particle is strongly coupled to a set of engineered reservoirs. The reservoirs are composed by collections of squeezed and displaced thermal modes, in contrast to...
Structure learning of Hamiltonians from real-time evolution
Ainesh Bakshi, Allen Liu, Ankur Moitra +1 more·Apr 30, 2024
We study the problem of Hamiltonian structure learning from real-time evolution: given the ability to apply $e^{-\mathrm{i} Ht}$ for an unknown local Hamiltonian $H = \sum_{a = 1}^m λ_a E_a$ on $n$ qubits, the goal is to recover $H$. This problem is ...
Quantum Cloud Computing: Trends and Challenges
Muhammed Golec, Emir Sahin Hatay, Mustafa Golec +3 more·Apr 30, 2024
Quantum computing (QC) is a new paradigm that will revolutionize various areas of computing, especially cloud computing. QC, still in its infancy, is a costly technology capable of operating in highly isolated environments due to its rapid response t...