Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Using anti-squeezed Schrödinger cat states for detection of a given phase shift
V. L. Gorshenin, K. D. Dyadkin, S. D. Chikalkin·Mar 2, 2026
We propose to use the antisqueezing-enhanced non-Gaussian Schrödinger cat quantum states of the probing light for the task of detection of a given phase shift in optical interferometers. We show that the antisqueezing allows to increase the robustnes...
Decoherence and entropy production due to quantum fluctuations of spacetime
Thiago H. Moreira·Mar 2, 2026
The intersection between quantum mechanics and gravitational physics has been providing challenging puzzles for decades. In this thesis, we study the dynamics of an open quantum system coupled with a bath of gravitons, the quanta of the gravitational...
Tensor-network methodology for super-moiré excitons beyond one billion sites
Anouar Moustaj, Yitao Sun, Tiago V. C. Antão +2 more·Mar 2, 2026
Computing excitonic spectra in quasicrystal and super-moiré systems constitutes a formidable challenge due to the exceptional size of the excitonic Hilbert space. Here, we demonstrate a tensor-network method for the real-space Bethe-Salpeter Hamilton...
Cavity-enhanced optical readout and control of nuclear spin qubits
Alexander Ulanowski, Johannes Früh, Fabian Salamon +2 more·Mar 2, 2026
Their exceptional coherence makes nuclear spins in solids a prime candidate for quantum memories in quantum networks and repeaters. Still, the direct all-optical initialization, coherent control, and readout of individual nuclear spin qubits have bee...
Quantum Network Simulation and Emulation: A Roadmap for Quantum Internet Design
Brian Doolittle, Michael Cubeddu·Mar 2, 2026
Quantum networks are advancing the information technology infrastructure of society. Simulation and emulation software tools have emerged to support the design, development, and deployment of quantum networks, however, classical simulation and emulat...
Minimal-backaction work statistics of coherent engines
Milton Aguilar, Franklin L. S. Rodrigues, Eric Lutz·Mar 2, 2026
Determining the work statistics of quantum engines is challenging due to measurement backaction. We here show that a dynamic Bayesian network-based measurement scheme, which preserves quantum coherence within an engine cycle, is minimally invasive, i...
Theory of the Uhlmann Phase in Quasi-Hermitian Quantum Systems
Xu-Yang Hou, Xin Wang, Hao Guo·Mar 2, 2026
Geometric phases play a fundamental role in understanding quantum topology, yet extending the Uhlmann phase to non-Hermitian systems poses significant challenges due to parameter-dependent inner product structures. In this work, we develop a comprehe...
Configurational control of photon emission from a molecular dimer
Maximilian Kögler, Nicolas Néel, Jörg Kröger·Mar 2, 2026
Tin-phthalocyanine molecules adsorbed on a NaCl ultrathin film on Au(111) exhibit electrofluorescence excited by a current across a scanning tunneling microscope junction. Exploring the dependence of the molecular monomer photon yield on the injected...
Local approach to entropy production in the nonequilibrium dynamics of open quantum systems
Irene Ada Picatoste, Alessandra Colla, Heinz-Peter Breuer·Mar 2, 2026
We discuss fundamental features of the local expression for the entropy production rate of the nonequilibrium quantum dynamics of open systems and its relations to memory effects and the spectrum of the generator of the dynamics. Defining the entropy...
Local integrals of motion encoded in a few eigenstates
J. Pawłowski, P. Łydżba, M. Mierzejewski·Mar 2, 2026
Many properties of a quantum system can be obtained from just a single eigenstate of its Hamiltonian. For example, a single eigenstate can be used to determine whether a system is integrable or chaotic and, in the latter case, to establish its therma...
Mapping g-factors and complex intervalley coupling in Si/SiGe by conveyor-mode shuttling
Mats Volmer, Tom Struck, Arnau Sala +7 more·Mar 2, 2026
As silicon spin qubit chips are increasing in qubit number and area, methods for the screening of qubit related material parameters become vital. Here we demonstrate the two-dimensional mapping of small variations of the electron g-factor of quantum ...
Time-dependent adiabatic elimination in matter-wave optics
Samuel Böhringer, Alexander Bott, Eric P. Glasbrenner·Mar 2, 2026
We show how the dynamics of a specific subset of states can be separated from the dynamic of the total quantum state via a time-dependent projector-based formalism of adiabatic elimination. Within our formalism, we assume explicit time dependency in ...
Nature abhors macroscopic superpositions
Filippus S. Roux·Mar 2, 2026
Superpositions of mass distributions can potentially lead to entanglement with the geometry of spacetime. Here we show that there exists a natural reluctance for macroscopic mass distributions to form such superpositions. The macroscopic superpositio...
Finite-Depth, Finite-Shot Guarantees for Constrained Quantum Optimization via Fejér Filtering
Chinonso Onah, Kristel Michielsen·Mar 2, 2026
We study finite-layer alternations of the \emph{Constraint--Enhanced Quantum Approximate Optimization Algorithm} (CE--QAOA), a constraint-aware ansatz that operates natively on block one-hot manifolds. Our focus is on feasibility and optimality guara...
Experimental realization and self-testing of semisymmetric informationally complete measurements via a one-dimensional photonic quantum walk
Xu Xu, Han-Yu Cheng, Meng-Yun Ma +7 more·Mar 2, 2026
Generalized quantum measurements play a crucial role in quantum mechanics, and symmetric informationally complete positive operator-valued measurements (SIC POVMs) provide a powerful and flexible framework for extracting information from quantum syst...
Quantum regression theorem in the Unruh-DeWitt battery
Manjari Dutta, Arnab Mukherjee, Sunandan Gangopadhyay·Mar 2, 2026
In this paper, we employ the quantum regression theorem, a powerful tool in the study of open quantum systems, to analytically study the correlation functions of an Unruh-DeWitt detector, which is an uniformly accelerated two-level quantum system, ab...
Distinguishing thermal and pseudothermal light by testing the Siegert relation
Xi Jie Yeo, Justin Yu Xiang Peh, Darren Ming Zhi Koh +2 more·Mar 2, 2026
Thermal light, including blackbody radiation and spontaneous emission, exhibits photon bunching. Thermal light sources, however, typically yield low spectral densities, limiting their practical utility. Pseudothermal light sources with higher brightn...
High-Performance Quantum Frequency Conversion from Ultraviolet to Telecom Band
Yi Yang, Bin Wang, Ji-Chao Lin +10 more·Mar 2, 2026
Quantum frequency conversion (QFC) is essential for bridging the spectral gap between stationary qubits and low-loss optical communication channels. In this work, we demonstrate a short-wavelength-pumping QFC with the first-order quasi-phase matching...
Gain-induced spectral non-degeneracy in type-II parametric down-conversion
Behnood Taheri, Denis Kopylov, Manfred Hammer +3 more·Mar 2, 2026
We demonstrate the novel effect of gain-induced spectral shifts in the type-II parametric down-conversion (PDC) process, which results in a transition from degenerate to non-degenerate PDC with increasing parametric gain. This effect, originating fro...
Shaping frequency-tunable single photons for quantum networking in waveguide QED
Álvaro Pernas, Ricardo Puebla·Mar 2, 2026
The exchange of quantum information among nodes in a quantum network is one of the main challenges in modern technologies. Superconducting waveguide QED networks hold great potential for realizing distributed quantum computation, where distinct nodes...