Papers

Peter D. Drummond, Alexander S. Dellios, Margaret D. Reid·Jun 11, 2026

We introduce a general phase-space representation that includes global quantum symmetries in the basis expansion. This method, called matrix phase-space, projects the basis onto a reduced Hilbert space, which can greatly reduce sampling errors of man...

Si-Yu Liu, Xin-Ze Song, Xiang-Yue Yu +3 more·Jun 11, 2026

We investigate the harvesting of quantum steering and its directional asymmetry between two Unruh-DeWitt detectors in a Lorentz-violating BTZ black hole spacetime. Since the detectors are located at different radial positions outside the black hole, ...

Naga Dileep Varikuti·Jun 11, 2026

We study operator growth in quantized non-KAM systems using out-of-time-ordered correlators (OTOCs), focusing on the kicked harmonic oscillator as a representative example. Since the classical harmonic oscillator is degenerate, the dynamics fall outs...

Shuai Zeng·Jun 10, 2026

Quantum clocks can acquire relativistic phases from motional or gravitational proper-time differences, but reduced clock dephasing alone does not certify nonclassical proper-time histories. We formulate this distinction as a channel-certification pro...

Christopher J. Axline, Stephan Gamper, Phoebe M. Tengdin +6 more·Jun 10, 2026

Efficient and stable microwave-optical transduction is a key enabling technology for distributed superconducting quantum computing and heterogeneous quantum networks. Electro-optic transducers based on thin-film lithium niobate (TFLN) have shown stro...

Rui Chao·Jun 10, 2026

Morphing circuits are a new paradigm for quantum error correction that relaxes hardware requirements. We present four constructions for CNOT-based CSS morphing circuits with explicit qubit connectivity degrees. All four constructions are specified in...

Seiseki Akibue, Rudy Raymond, Suguru Tamaki +1 more·Jun 10, 2026

Quantum random access codes (QRACs) ask how well N classical bits can be encoded into M qubits while allowing any single bit to be recovered. Although the Nayak bound remains the standard general upper bound on the decoding probability, numerical evi...

João Pedro Gama D'Elia, Irene D'Amico, Thereza Paiva·Jun 10, 2026

Symmetry-protected topological phases have attracted significant interest at the fundamental level and as a potential platform for quantum information processing, owing to their protected edge states and resilience to perturbations. Applying these fe...

Colin V. Coane, Francesco Iachello·Jun 10, 2026

We demonstrate how supersymmetries of Hamiltonians for coupled Bose-Fermi systems can be used to place the Hamiltonians of the Jaynes-Cummings model and Dicke model under the rotating wave approximation in matrix form and provide explicit analytic so...

Stanislav Filatov, Marcis Auzinsh·Jun 10, 2026

Pure two-qubit entanglement is usually characterized by scalar quantities such as concurrence. Here we show that it also has a natural geometric form. In the Pauli correlation tensor, maximally entangled states appear as improper orthogonal maps betw...

Robson Christie, Jaewoo Joo, Greg Kaplanek +2 more·Jun 10, 2026

We formulate stochastic inflation in an open quantum system framework. The field coarse-grained in a patch of fixed physical size, and the total momentum of that patch, form a canonical pair and act on a one-mode Fock space which we identify as the "...

Viola Gattus, Peter Millington·Jun 10, 2026

Scalar fields provide perhaps the simplest playground in which to develop our understanding of quantum field theory. In this lecture, we consider what it means to write down a scalar quantum field theory and how we can give geometrical interpretation...

Uma Girish, Alex May, Natalie Parham +1 more·Jun 10, 2026

In the private simultaneous message (PSM) setting, $k$ players obtain inputs $x_i\in\{0,1\}^n$ and then each send messages to a referee, who should learn $f(x_1,...,x_k)$ but no other information about $(x_1,...,x_k)$. The PSM setting was introduced ...

I. A. Aleksandrov, E. V. Perelygin, D. V. Chubukov·Jun 10, 2026

We develop a perturbative description of vacuum radiative processes in quantum electrodynamics with a prescribed external electromagnetic background capable of producing electron-positron pairs. Since the initial vacuum is then unstable and the in- a...

André T. Cesário, Marcos G. Alpino, Reinaldo O. Vianna +1 more·Jun 10, 2026

We develop a unified dynamical-spectral framework for equilibration in isolated quantum systems based on a subspace coarse-graining approach. Central to our formulation is the Leakage Fidelity Function (LFF), defined as the probability that a unitari...

Rolando Ramirez Camasca, Xiang Li, Ting-Chun Lin +1 more·Jun 10, 2026

Given a quantum critical wavefunction in any dimension, we propose a reconstructed Hamiltonian, analogous to the ones previously found for 1+1d CFT and for 2+1d bosonic liquid topologically-ordered states. We test numerically that, for known regulari...

N. L. Diaz, M. Cerezo, Paolo Braccia·Jun 10, 2026

Recent efforts to formulate quantum mechanics in a way that treats space and time on a more equal footing have led to a large variety of spacetime-oriented approaches. In this work we present a detailed study of spacetime states, the objects that pla...

Friedrich Hübner, Sun Woo P. Kim·Jun 10, 2026

`Solvable' circuits, such as dual unitaries and its generalisations, have arisen as paradigmatic examples of tractable chaotic non-equilibrium dynamics, both in classical and quantum systems. However, while increasingly more complicated sufficient co...

Avi Vadali, Robijn Vanhove, Ruben Verresen +2 more·Jun 10, 2026

Topological quantum computation relies on braiding non-Abelian anyons, but requires the underlying topological order to survive imperfect state preparation and environmental noise. We show that the instability of topological order to wavefunction def...

Kosei Fujiki, Kenya Tasuki·Jun 10, 2026

We study the time evolution of tripartite entanglement in heavy local quenches in two-dimensional holographic conformal field theories. Our diagnostic is the genuine multi-entropy of adjacent intervals, computed from both bulk and boundary perspectiv...