Papers

Erik Rosendahl Kjellgren, Karl Michael Ziems, Peter Reinholdt +3 more·Jun 13, 2026

We introduce the orbital-optimized multistate contracted variational quantum eigensolver (oo-MC-VQE) method with spin-adapted operators for the computation of ground and excited states, as well as state-specific and transition properties. The use of ...

Zain H. Saleem·Jun 13, 2026

We investigate the speed at which entanglement can be generated by an interaction parameter encoded in a two-qubit Hamiltonian, quantified by the derivative of concurrence with respect to the coupling parameter. For arbitrary pure two-qubit states ev...

Ahad Nokhostin Helm, Brandon Leipner-Johns, Rachel Wortis·Jun 13, 2026

Generically a quantum system initialized in an unentangled state will, under unitary dynamics, rapidly become entangled, a process closely related to information transport and to thermalization. Disorder can suppress the growth of entanglement and re...

Ehsan Erfani Maharat, Ali Ahanj, Mohsen Sarbishaei·Jun 13, 2026

We investigate Hardy- and Cabello-type logical structures within spatial and temporal extensions of the Frauchiger--Renner (FR) framework, embedding these constructions directly into the FR multi-observer architecture. In the spatial multi-observer s...

Vicenzo Scavino Alfaro·Jun 13, 2026

Quantum error mitigation methods are often compared through infinite-shot bias, but real experiments are decided by finite sampling budgets, estimator instabilities, and per-shot resource costs. We develop a certified finite-shot operating-window the...

Zirui Wang, Aras Repond, Shawn Westerdale +1 more·Jun 13, 2026

Direct dark matter detection experiments require large-scale photon sensing arrays with hundreds of thousands of synchronized readout channels. Silicon photomultipliers (SiPMs) have emerged as a leading candidate for these detectors due to their high...

Erik Lundblad, Mira Abu Yahia, Antonius Johannes Renders +3 more·Jun 13, 2026

We propose a scheme for distributing entanglement over global distances in a heralded manner by using satellites to physically transport entangled processor nodes with rare-earth-ion qubits. A full analysis of channel losses, errors and background li...

Ioannis Karapatzakis, Jeremias Resch, David Hunger +1 more·Jun 13, 2026

Single color centers in diamond offer a local probe of their cryogenic environment, providing a direct way to quantify heating in spin-control hardware. Here, we establish a single spectrally stable tin-vacancy (SnV) center as an on-chip thermometer ...

Shebha Anandhi Jegadeesan, Yujie Zhao, Robert Hunter +6 more·Jun 13, 2026

Periodically driven dissipative systems can settle into steady orbits - fixed loops on their dynamical manifolds. In quantum mechanics, steady orbits occur in cooling engines (used to initialise quantum devices), coherent oscillators (such as lasers ...

Nazanin Dehghan, Alessio D'Errico, Yingwen Zhang +3 more·Jun 13, 2026

Entangled photon pairs produced by spontaneous parametric down-conversion exhibit rich spatial entanglement structure that is often difficult to probe with conventional measurements. Here, we show that spin-orbit optical elements can convert this spa...

Chris Camaño, Ethan N. Epperly, Raphael A. Meyer +1 more·Jun 13, 2026

Many problems in modern scientific computing are challenging because of a \emph{curse of dimension}, where their mathematical formulation involves objects whose dimension is \emph{exponential} in the nominal "size" of the problem. Tensor networks can...

Yuan Wang, Marcin Muszynski, Avinash Dash +3 more·Jun 13, 2026

Generative modelling requires efficient stochastic nonlinear transformations and physical platforms that can naturally realise them. We experimentally demonstrate that nonlinear optical systems operating in the strong light-matter coupling regime can...

Junbin Long, Mu Zhou, Saitao Zhang +2 more·Jun 13, 2026

Analog matrix computing (AMC) circuits leverage resistive memory arrays to perform matrix operations in a massively parallel manner, providing an efficient approach for accelerating data-intensive tasks. However, hardware non-idealities severely impa...

Mustapha Maamache·Jun 13, 2026

The Dirac oscillator is obtained from the Dirac Hamiltonian $H^{\mathrm{D}} = \left( c\vecα\cdot \vec{p} + mc^{2}β\right)$ by modifying the momentum through a non-Hermitian substitution $\overrightarrow{p} \rightarrow \overrightarrow{p} \pm iωβ\overr...

Patrick Barron, Krisztián Szabó, Gábor J. Halász +2 more·Jun 13, 2026

Strong light-matter coupling between molecules and optical or plasmonic cavity modes has emerged as a promising platform for advancing photonics, materials science, and chemistry. However, optical cavities and plasmonic resonators in particular are i...

Thi Minh Chau Nguyen, Hien Trang Nguyen, Duc Anh Nguyen +3 more·Jun 13, 2026

Graph-based recommender systems are highly effective at extracting collaborative signals from user--item interactions, and federated learning (FL) allows these models to be trained while preserving user privacy. However, aggregating graph representat...

Silvester G. A. Borsboom, José P. Dupont·Jun 13, 2026

Spontaneous symmetry breaking (SSB) is central to modern physics but is conventionally defined only for infinite systems, raising challenges for its interpretation in finite, real-world setups. This paper argues that the key to resolving this issue l...

Syeda Rafisa Rahaman, Shreekantha Sil, Nilanjan Bondyopadhaya·Jun 13, 2026

We study the transport characteristics of an extended version of the Su-Schrieffer-Heeger (SSH) model with next-nearest-neighbor (NNN) interactions and non-Hermitian onsite energies. We observed that transport in such a system is significantly modifi...

Daniel Montesinos, Gian Luca Giorgi, Roberta Zambrini·Jun 13, 2026

Reservoir models offer a hardware-efficient learning paradigm for noisy intermediate-scale quantum devices by exploiting untrained quantum dynamics as a fixed feature map and restricting optimization to a simple classical readout layer. We propose a ...

Manghang Limbu, Pramod Kamal Kharel, Rohit Bhattarai +1 more·Jun 13, 2026

We study pseudo entropy $\mathcal{S}$, a recent generalization of entanglement entropy, for scalar cosmological perturbations in de Sitter space with sound speed $0.024 \leq c_s \leq 1$, and in expanding and contracting FLRW backgrounds with varying ...