Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Pulsed single-photon spectroscopy of an emitter with vibrational coupling
Sourav Das, Aiman Khan, Elnaz Darsheshdar +2 more·Dec 16, 2025
We analytically derive the quantum state of a single-photon pulse scattered from a single quantum two-level emitter interacting with a vibrational bath. This solution for the quadripartite system enables an information-theoretic characterization of v...
Quantum Radiometric Calibration
Leif Albers, Jan-Malte Michaelsen, Roman Schnabel·Dec 16, 2025
Optical quantum computing, as well as quantum communication and sensing technology based on quantum correlations are in preparation. These require photodiodes for the detection of about 10^16 photons per second with close to perfect quantum efficienc...
Sample-based quantum diagonalization as parallel fragment solver for the localized active space self-consistent field method
Qiaohong Wang, Mario Motta, Ruhee D'Cunha +7 more·Dec 16, 2025
Accurately and efficiently describing strongly correlated electronic systems is a central challenge in quantum computational chemistry, with classical and quantum computers. The localized active space self-consistent field method (LASSCF) uses a prod...
Women in Theoretical Quantum Physics in Brazil:demographics, career profiles, recognition, and leadership
Tatiana Pauletti, Paula Homem de Mello, Thereza Paiva +1 more·Dec 16, 2025
Gender imbalance in Physics remains a persistent global challenge, and Brazil is no exception. While women account for only 24% of Physics faculty in the country, their representation in Quantum Physics is even smaller. In this work, we provide the f...
Quantum Fisher-information limits of resonant nanophotonic sensors: why high-Q is not optimal even at the quantum limit
J. Sumaya-Martinez·Dec 16, 2025
We develop a quantum metrological framework for resonant nanophotonic sensors based on subwavelength Fabry--Perot slit cavities. Building on classical Fisher-information analyses of resonant transmission sensors, we model parameter encoding as a phas...
Geometric Latent Space Tomography with Metric-Preserving Autoencoders
S. M. Yousuf Iqbal Tomal, Abdullah Al Shafin·Dec 16, 2025
Quantum state tomography faces exponential scaling with system size, while recent neural network approaches achieve polynomial scaling at the cost of losing the geometric structure of quantum state space. We introduce geometric latent space tomograph...
Hyperfine spectroscopy of optical-cycling transitions in singly ionized thulium
Patrick Müller, Andrei Tretiakov, Amanda Younes +3 more·Dec 16, 2025
We present a spectroscopic investigation of $^{169}\mathrm{Tm}^+$ that provides two key foundations for its use as a platform for advanced quantum applications. First, we establish the complete spectroscopic road map for optical cycling (including la...
Exact formula for geometric quantum complexity of cosmological perturbations
Satyaki Chowdhury, Jakub Mielczarek·Dec 16, 2025
Nielsen's geometric approach offers a powerful framework for quantifying the complexity of unitary transformations. In this formulation, complexity is defined as the length of the minimal geodesic in a suitably constructed geometric space associated ...
Large-$n$ $O(n)$ with long-range interactions: integrability and resonance dynamics
Guido Giachetti, Nicolo Defenu·Dec 16, 2025
We study the the large-$n$ dynamics of the long-range quantum $O(n)$ model, focusing on the strong long-range regime $α<d$. The dynamics of the model exhibits non-trivial features on mesoscopic timescales $t\sim\ln N$, due to the activation of parame...
A quantum advection-diffusion solver using the quantum singular value transform
Gard Olav Helle, Tommaso Benacchio, Anna Bomme Ousager +1 more·Dec 16, 2025
We present a quantum algorithm for the simulation of the linear advection-diffusion equation based on block encodings of high order finite-difference operators and the quantum singular value transform. Our complexity analysis shows that the higher or...
Noise-Induced Thermalization in Quantum Systems
Sameer Dambal, Yu Zhang, Eric R Bittner +1 more·Dec 16, 2025
In the current Noisy Intermediate-Scale Quantum era, noise is widely regarded as the primary obstacle to achieving fault-tolerant quantum computation. However, certain stages of the quantum computing pipeline can, in fact, benefit from this noise. In...
Entanglement without Quantum Mechanics: Operational Constraints on the Quantum Signature
Samuel Schlegel, Borivoje Dakić, Flavio Del Santo·Dec 16, 2025
Entanglement is often regarded as an inherently quantum feature. We show that this does not have to be the case: under restricted operational access, classical correlations can appear nonseparable when expressed in the formalism of quantum mechanics....
The fermion sign problem in Gauss law sectors of quantum link models with dynamical matter
Pallabi Dey, Debasish Banerjee, Emilie Huffman·Dec 16, 2025
The fermion sign problem poses a formidable challenge to the use of Monte Carlo methods for lattice gauge theories with dynamical fermionic matter fields. A meron cluster algorithm recently formulated for gauge fields represented as spin-$\frac{1}{2}...
Extreme non-negative Wigner functions
Zacharie Van Herstraeten, Jack Davis, Nuno C. Dias +3 more·Dec 16, 2025
Providing an operational characterization of the Wigner-positive states (WPS), i.e., the set of quantum states with non-negative Wigner function, is a longstanding open problem. For pure states, the only WPS are Gaussian states, but the situation is ...
Strong-to-weak symmetry breaking in monitored dipole conserving quantum circuits
Caterina Zerba, Sarang Gopalakrishnan, Michael Knap·Dec 16, 2025
We explore the information-theoretic phases of monitored quantum circuits subject to dynamics that conserves both charge and dipole moment, as well as measurements of the local charge density. Explicitly, both charge and dipole-moment conservation ar...
Growth and spreading of quantum resources under random circuit dynamics
Sreemayee Aditya, Xhek Turkeshi, Piotr Sierant·Dec 16, 2025
Quantum many-body dynamics generate nonclassical correlations naturally described by quantum resource theories. Quantum magic resources (or nonstabilizerness) capture deviation from classically simulable stabilizer states, while coherence and fermion...
Symmetric Dicke States as Optimal Probes for Wave-Like Dark Matter
Ping He, Jing Shu, Bin Xu +1 more·Dec 16, 2025
We identify symmetric Dicke states as the optimal quantum probes for distributed sensing of wave-like dark-matter fields. Within an ensemble-averaged quantum-metrological framework that incorporates the field's random phases and finite coherence, the...
The entangling power of non-entangling channels
Julien Pinske, Jan Sperling, Klaus Mølmer·Dec 16, 2025
There are processes that cannot generate entanglement but may, nevertheless, amplify entanglement already present in a system. Here, we show that a non-entangling operation can increase the Schmidt number of a quantum state only if it can generate en...
Characterising the sets of quantum states with non-negative Wigner function
Nicolas J. Cerf, Ulysse Chabaud, Jack Davis +3 more·Dec 16, 2025
For Hilbert spaces $\mathcal H\subseteq L^2(\mathbb R)$ we consider the convex sets $\mathcal D_+(\mathcal H)$ of Wigner-positive states (WPS), i.e.~density matrices over $\mathcal H$ with non-negative Wigner function. We investigate the topological ...
Stabilizers may be poor bounds for fidelities
Aaron Z. Goldberg·Dec 16, 2025
The defining feature of ideal Gottesman-Kitaev-Preskill (GKP) states is that they are unchanged by stabilizers, which allow them to detect and correct for common errors without destroying the quantum information encoded in the states. Given this prop...