Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Improved Clifford operations in constant commutative depth
Richard Cleve, Zhiqian Ding, Luke Schaeffer·Oct 6, 2025
The commutative depth model allows gates that commute with each other to be performed in parallel. We show how to compute Clifford operations in constant commutative depth more efficiently than was previously known. Bravyi, Maslov, and Nam [Phys. Rev...
Variational optimization of projected entangled-pair states on the triangular lattice
Jan Naumann, Jens Eisert, Philipp Schmoll·Oct 6, 2025
We introduce a general corner transfer matrix renormalization group algorithm tailored to projected entangled-pair states on the triangular lattice. By integrating automatic differentiation, our approach enables direct variational energy minimization...
Creating Qubit States with Degenerate Two-level Systems
Zhuoran Bao, Daniel F. V. James·Oct 6, 2025
A qubit, or quantum bit, is conventionally defined as "a physical system for storing information that is capable of existing in either of two quantum states or in a superposition of both". In this paper, we examine the simple question of whether two ...
The tetrahedral Horn problem and asymptotics of U(n) 6j symbols
Anton Alekseev, Matthias Christandl, Thomas C. Fraser·Oct 6, 2025
Horn's problem is concerned with characterizing the eigenvalues $(a,b,c)$ of Hermitian matrices $(A,B,C)$ satisfying the constraint $A+B=C$ and forming the edges of a triangle in the space of Hermitian matrices. It has deep connections to tensor prod...
A new application of the Fox-Wright functions: the coherent states formalism
Dusan Popov·Oct 6, 2025
In this paper we extend the applicability of Fox-Wright functions beyond mathematics, specifically in quantum physics. We focused our attention on a new application, on the connection between the Fox-Wright functions and the generalized coherent stat...
Information-thermodynamic bounds on precision in interacting quantum systems
Ryotaro Honma, Tan Van Vu·Oct 6, 2025
The thermodynamic uncertainty relation quantifies a trade-off between the relative fluctuations of trajectory currents and the thermodynamic cost, indicating that the current precision is fundamentally constrained by entropy production. In classical ...
Super-resolution of partially coherent bosonic sources
Joaquín López-Suárez, Michalis Skotiniotis·Oct 6, 2025
We consider the problem of imaging two partially coherent sources and derive the ultimate quantum limits for estimating all relevant parameters, namely their separation, relative intensity, as well as their coherence factor. We show that the separati...
Far-from-equilibrium thermodynamics of non-Abelian thermal states
Franklin L. S. Rodrigues, Eric Lutz·Oct 6, 2025
Noncommutativity of observables is a central feature of quantum physics. It plays a fundamental role in the formulation of the uncertainty principle for complementary variables and strongly affects the laws of thermodynamics for systems with noncommu...
Symmetric $C_Z$ gate for ultracold neutral atoms based on counterdiabatic driving at Rydberg excitation
I. I. Beterov, K. V. Kozenko, P. Xu +1 more·Oct 6, 2025
We designed a scheme for a neutral atom Rydberg blockade $C_Z$ gate based on the double sequence of adiabatic pulses applied symmetrically to both atoms and using counterdiabatic driving for Rydberg excitation. This provides a substantial reduction i...
Finite temperature dopant-induced spin reorganization explored via tensor networks in the two-dimensional $t$-$J$ model
Yintai Zhang, Aritra Sinha, Marek M. Rams +1 more·Oct 6, 2025
We study the two-dimensional $t$--$J$ model at finite temperature directly in the thermodynamic limit using purification represented by an infinite projected entangled-pair state (iPEPS). We reach temperatures down to $T/t=0.1$ and hole concentration...
Collusion-Resistant Quantum Secure Key Leasing Beyond Decryption
Fuyuki Kitagawa, Ryo Nishimaki, Nikhil Pappu·Oct 6, 2025
Secure key leasing (SKL) enables the holder of a secret key for a cryptographic function to temporarily lease the key using quantum information. Later, the recipient can produce a deletion certificate, which proves that they no longer have access to ...
Quantum Reservoir Computing for Credit Card Default Prediction on a Neutral Atom Platform
Giacomo Vitali, Chiara Vercellino, Paolo Viviani +9 more·Oct 6, 2025
In this paper, we define and benchmark a hybrid quantum-classical machine learning pipeline by performing a binary classification task applied to a real-world financial use case. Specifically, we implement a Quantum Reservoir Computing (QRC) layer wi...
Quantum Subgradient Estimation for Conditional Value-at-Risk Optimization
Vasilis Skarlatos, Nikos Konofaos·Oct 6, 2025
Conditional Value-at-Risk (CVaR) is a leading tail-risk measure in finance, central to both regulatory and portfolio optimization frameworks. Classical estimation of CVaR and its gradients relies on Monte Carlo simulation, incurring $O(1/ε^2)$ sample...
Enhancing Optomechanical Entanglement and Mechanical Squeezing by the Synergistic Effect of Quadratic Optomechanical Coupling and Coherent Feedback
Ya-Feng Jiao, Ruo-Chen Wang, Jing-Xue Liu +5 more·Oct 6, 2025
Quantum entanglement and squeezing associated with the motions of massive mechanical oscillators play an essential role in both fundamental science and emerging quantum technologies, yet realizing such macroscopic nonclassical states remains a formid...
A Lie Theoretic Framework for Controlling Open Quantum Systems
Corey O'Meara·Oct 6, 2025
This thesis focuses on the Lie-theoretic foundations of controlled open quantum systems. We describe Markovian open quantum system evolutions by Lie semigroups, whose corresponding infinitesimal generators lie in a special type of convex cone - a Lie...
Curved Boolean Logic: A Contextual Generalization of Propositional Logic with Algorithmic Consequences
Maximilian R. P. von Liechtenstein·Oct 6, 2025
Curved Boolean Logic (CBL) generalizes propositional logic by allowing local truth assignments that do not extend to a single global valuation, analogous to curvature in geometry. We give equivalent sheaf and exclusivity-graph semantics and a context...
Log-majorizations between quasi-geometric type means for matrices
Fumio Hiai·Oct 6, 2025
In this paper, for $α\in(0,\infty)\setminus\{1\}$, $p>0$ and positive semidefinite matrices $A$ and $B$, we consider the quasi-extension $\mathcal{M}_{α,p}(A,B):=\mathcal{M}_α(A^p,B^p)^{1/p}$ of several $α$-weighted geometric type matrix means $\math...
Asymptotic Vanishing of the Success Probability in Shor's Algorithm
João P. da Cruz·Oct 6, 2025
Shor's factoring algorithm guarantees a success probability of at least one half for any fixed modulus N = pq with distinct primes p and q. We show that this guarantee does not extend to the asymptotic regime. As N -> infinity, the multiplicative gro...
The PPP model - a minimal viable parametrisation of conjugated chemistry for modern computing applications
Marcel David Fabian, Nina Glaser, Gemma C. Solomon·Oct 6, 2025
The semi-empirical Pariser-Parr-Pople (PPP) Hamiltonian is reviewed for its ability to provide a minimal model of the chemistry of conjugated $π$-electron systems, and its current applications and limitations are discussed. From its inception, the PP...
Novel frame changes for quantum physics
Pierre-Louis Giscard, Omid Faizy, Christian Bonhomme·Oct 6, 2025
We present novel, exotic types of frame changes for the calculation of quantum evolution operators. We detail in particular the biframe, in which a physical system's evolution is seen in an equal mixture of two different standard frames at once. We p...