Papers
Probing excited-state quantum phase transitions with trapped cold ions
Marek Kuchař, Michal Macek·Mar 30, 2026
We propose concrete protocols to realize quantum criticality due to excited-state quantum phase transitions (ESQPTs) experimentally in presumably the simplest and most resilient system involving a single trapped ion oscillating in a radio-frequency P...
Open-System Adiabatic Quantum Search under Dephasing
Afaf El Kalai, Peter J. Eder, Christian B. Mendl·Mar 30, 2026
Adiabatic quantum algorithms must evolve slowly enough to suppress non-adiabatic transitions while remaining fast enough to be practical. In open systems, this trade-off is reshaped by decoherence. For Hamiltonians subject to dephasing Lindbladians, ...
Phase statistics of a single qubit emission as a direct probe of its coherence
A. Sultanov, E. Mutsenik, L. Kaczmarek +4 more·Mar 30, 2026
The emission of photon from an individual atom encodes the phase of its initialized quantum state. Using single-shot heterodyne detection, we measure the phase distribution of the emission from a superconducting transmon qubit in an open waveguide co...
Perspective of Fermi's golden rule and its generalizations in chemical physics
Seogjoo J. Jang, Goun Kim, Young Min Rhee·Mar 30, 2026
This perspective provides a succinct history of Fermi's golden rule (FGR), overview of its derivation, assumptions, and representative forms. Major applications of FGR, mostly in the field of chemical physics, are reviewed. These illustrate the broad...
Genuine and Non-Genuine Quantum Non-Markovianity: A Unified Information-Theoretic Review
Rajeev Gangwar, Ujjwal Sen·Mar 30, 2026
Understanding whether the features of open quantum dynamics are genuinely quantum remains a central challenge in quantum dynamics. Even though the non-Markovian behavior of quantum dynamics has been widely investigated across different settings, ther...
PyEncode: An Open-Source Library for Structured Quantum State Preparation
Krishnan Suresh, Sanjay Suresh·Mar 30, 2026
Quantum algorithms require encoding classical vectors as quantum states, a step known as amplitude encoding. General-purpose state preparation routines accept any input vector of length $N = 2^m$ and produce circuits with $\bigO{2^m}$ gates. However,...
Exact Skin Critical Phase and Configurable Fractal Wavefunctions via Imaginary Gauge Phase Imprint in Non-Hermitian Lattices
Ji-Long Dong, Shi-Liang Zhu, Dan-Wei Zhang·Mar 30, 2026
The generation of complex states like multifractal critical states has been an outstanding challenge in both classical and quantum physics. Here we propose a general framework, termed the imaginary gauge phase imprint, allowing to engineer rigorous w...
Quantum Coherence and Giant Enhancement of Positron Channeling Radiation
Michael Shatnev·Mar 29, 2026
We present a quantum-mechanical calculation of positron channeling radiation in a planar harmonic potential, explicitly accounting for the interference between transition amplitudes from different transverse energy levels. Because the planar channel ...
Coherence-Controlled Quantum Zeno Dynamics from Exact Reset Maps
Jishad Kumar, Achilleas Lazarides, Tapio Ala-Nissila·Mar 29, 2026
We develop an exact framework for quantum Zeno and anti-Zeno dynamics in a broad class of open systems, whose microscopic Hamiltonians are quadratic in bosonic or fermionic operators. We treat the environment through an exact stroboscopic resetting s...
High performance imaging of $^{171}$Yb atom in shallow clock-magic tweezer by alternating dual-tone narrowline cooling
Yunheung Song, Kangheun Kim, Jeong Ho Han +2 more·Mar 29, 2026
We demonstrate imaging $^{171}$Yb single atoms in clock-magic tweezers of 759.4 nm wavelength, with above 99.9% fidelity and survival. We use alternating dual-tone narrowline imaging for more efficient three-dimensional cooling in tweezers, allowing ...
Exact diagonalization of a non-quadratic bosonic Liouvillian with two-body loss
Masaaki Tokieda·Mar 29, 2026
We present the full diagonalization of a non-quadratic bosonic Liouvillian with a two-body loss term. The Liouvillian is shown to be exactly diagonalizable in terms of left and right confluent hypergeometric functions, whose distinction arises from t...
First order Maxwell operator formalism for macroscopic quantum electrodynamics
Ishita Agarwal, Ankit Kundu, Christian M. Lange +1 more·Mar 29, 2026
Standard macroscopic QED is built on the second-order Green's function for the electric field and discards open-system boundary terms. Here we develop a first-order electromagnetic operator approach that retains both $\mathbf{E}$ and $\mathbf{H}$ and...
Decoherence-Free Qubit and Chiral Emission from a Giant Molecule in Waveguide QED
Yang Wang, Juan José García-Ripoll, Alan C. Santos·Mar 28, 2026
Combining decoherence protection with directional photon emission in a single waveguide quantum electrodynamics (QED) device remains an open challenge. Here we show that an artificial giant molecule -- strongly interacting artificial atoms coupled to...
Trade-off between coherence and heat in a non-Markovian dephasing dynamics
Marino P. Lenzarini, Diogo O. Soares-Pinto·Mar 28, 2026
How quantum coherence influences thermodynamic behavior remains an open question in quantum thermodynamics. Here we investigate this relation within the pure dephasing framework, where a central qubit interacts with a finite Ising-like spin environme...
Quantum Bit Error Rate Analysis in BB84 Quantum Key Distribution: Measurement, Statistical Estimation, and Eavesdropping Detection
Jaydeep Rath, Prajwal Panth, P. S. N. Bhaskar·Mar 28, 2026
Quantum Key Distribution (QKD) provides information-theoretic security by exploiting the principles of quantum mechanics. Among QKD protocols, the BB84 scheme remains the most widely adopted for both theoretical research and practical implementation....
Hyperbolic Cluster States for Fault-Tolerant Measurement-Based Quantum Computing
Ahmed Adel Mahmoud, Gabrielle Tournaire, Sven Bachmann +1 more·Mar 27, 2026
Fault-tolerant measurement-based quantum computing (MBQC) provides a compelling framework for fault-tolerant quantum computation, in which quantum information is processed through single-qubit measurements on a three-dimensional entangled resource kn...
Thermoforesis from generalized Caldeira-Leggett models
Daniel Valente, Maurício Matos, Thiago Werlang·Mar 27, 2026
The standard Caldeira-Leggett model addresses the problem of Brownian motion in a thermal equilibrium environment. Here, we look for generalizations of the Caldeira-Leggett model to account for thermal gradients in the environment. We devise two type...
The perturbative method for quantum correlations
Sacha Cerf, Harold Ollivier·Mar 27, 2026
The set $\mathcal{Q}$ of quantum correlations is the collection of all possible probability distributions on measurement outcomes achievable by space-like separated parties sharing a quantum state. Since the original work of Tsirelson [Tsirelson, Let...
Rotating-Wave and Secular Approximations for Open Quantum Systems
Daniel Burgarth, Paolo Facchi, Giovanni Gramegna +1 more·Mar 27, 2026
We derive a nonperturbative bound on the distance between evolutions of open quantum systems described by time-dependent generators. We show how this result can be employed to provide an explicit upper bound on the error of the rotating-wave approxim...
Entanglement as Memory: Mechanistic Interpretability of Quantum Language Models
Nathan Roll·Mar 27, 2026
Quantum language models have shown competitive performance on sequential tasks, yet whether trained quantum circuits exploit genuinely quantum resources -- or merely embed classical computation in quantum hardware -- remains unknown. Prior work has e...