Papers
Photonic qubit encoding interconversion for heterogeneous quantum networking
Vedansh Nehra, Richard J. Birrittella, Christopher C. Tison +10 more·Apr 2, 2026
Quantum information processing, communication, and sensing networks are being developed with various qubit platforms that use different encoding schemes. Connecting quantum network nodes to distribute entanglement requires matching photon qubit basis...
Emergence of volume-law scaling for entanglement negativity from the Hawking radiation of analogue black holes
S. Mahesh Chandran, Uwe R. Fischer·Apr 2, 2026
The quantum information content of Hawking radiation holds the key to understanding black-hole evaporation and the fate of unitarity. Motivated by recent advances in cold-atom experiments, we develop a lattice-regularization approach aimed at simulat...
Ultrafast Ionization Dynamics Encoded in a Photoelectron Spin Torus
Xiaodan Mao, Feng He, Pei-Lun He·Apr 2, 2026
We demonstrate that strong-field ionization of atoms in circularly polarized laser fields generates a photoelectron spin texture with toroidal topology in momentum space. Using time-dependent Schrödinger equation simulations, spin-resolved classical-...
Topology-Hiding Connectivity-Assurance for QKD Inter-Networking
Margherita Cozzolino, Stephan Krenn, Thomas Lorünser·Apr 2, 2026
While QKD ensures information-theoretic security at the link level, real-world deployments depend on trusted repeaters, creating potential vulnerabilities. In this paper, we thus introduce a topology-hiding connectivity assurance protocol to enhance ...
Topology-Hiding Path Validation for Large-Scale Quantum Key Distribution Networks
Stephan Krenn, Omid Mir, Thomas Lorünser +2 more·Apr 2, 2026
Secure long-distance communication in quantum key distribution (QKD) networks depends on trusted repeater nodes along the entire transmission path. Consequently, these nodes will be subject to strict auditing and certification in future large-scale Q...
A Differentiable Physical Framework for Goal-Driven Spin-State Engineering in Magnetic Resonance Spectroscopy
Gaocheng Fu, Shiji Zhang, Kai Huang +4 more·Apr 2, 2026
Magnetic Resonance Spectroscopy (MRS) offers a unique non-invasive window into metabolic processes, yet its potential remains strictly constrained by severe spectral congestion and intrinsic insensitivity. Traditional pulse sequence design, tethered ...
Single-shot measurement learning as a self-certifying estimator for quantum-enhanced sensing
Jeongho Bang·Apr 2, 2026
Single-shot measurement learning (SSML) learns a compensation unitary from a one-bit success/failure record and halts after a prescribed run of consecutive successes. We recast SSML as an adaptive estimator on a parameterized sensing manifold and ask...
Codimension-controlled universality of quantum Fisher information singularities at topological band-touching defects
C. A. S. Almeida·Apr 2, 2026
Topological phase transitions in generic multiband systems are mediated by band-touching defects whose codimension -- the number of momentum directions along which the gap closes linearly -- varies across universality classes. Although singular behav...
Practical Tomography of Multi-Time Processes
Abhinash Kumar Roy, Varun Srivastava, Christina Giarmatzi +1 more·Apr 1, 2026
Characterising multi-time quantum processes is essential for analysing temporally correlated noise and for designing effective control and mitigation strategies. A complete operational description through multi-time process tomography requires an inf...
Conditional channel entropy sets fundamental limits on thermodynamic quantum information processing
Himanshu Badhani, Siddhartha Das·Apr 1, 2026
The thermodynamic resourcefulness of quantum channels primarily depends on their underlying causal structure and their ability to generate quantum correlations. We quantify this interplay within the resource theory of athermality for bipartite quantu...
Programmable Signal Design for Quantum Phase Estimation via Quantum Signal Processing
Zikang Jia, Suying Liu, Yulong Dong·Apr 1, 2026
Quantum phase estimation is a central primitive in quantum algorithms and sensing, where performance is governed by the sensitivity of measurement signals to the target parameter. While existing methods have developed increasingly sophisticated infer...
Learning and Generating Mixed States Prepared by Shallow Channel Circuits
Fangjun Hu, Christian Kokail, Milan Kornjača +5 more·Apr 1, 2026
Learning quantum states from measurement data is a central problem in quantum information and computational complexity. In this work, we study the problem of learning to generate mixed states on a finite-dimensional lattice. Motivated by recent devel...
Principal component analysis of wavefunction snapshots in non-equilibrium dynamics
Dharmesh Yadav, Devendra Singh Bhakuni, Bijay Kumar Agarwalla·Apr 1, 2026
We study non-equilibrium quantum dynamics by performing principal component analysis on the data sets of wavefunction snapshots. We show that a specific transformation of the data sets maximizes the information content in the largest principal compon...
Tunable information insulation induced by constraint mismatch
Akshay Panda, Anwesha Chattopadhyay·Apr 1, 2026
We study a composite model of two $1D$ $PXP$ chains with dual constraints, forming a junction that acts as an infinite kinematic barrier to quantum information exchange. Moreover, the hard wall at the junction which acts as a perfect reflector, preve...
Survival of nonclassical correlations in Lorentz-violating spacetime
Yangchun Tang, Zhilong Liu, Wentao Liu +1 more·Apr 1, 2026
The breakdown of Lorentz invariance, a potential signature of quantum gravity, offers a window into physics beyond general relativity. We investigate how such a violation, embodied by the Einstein-Bumblebee black hole spacetime, influences the nonloc...
Structured detection microscopy
Larnii Booth, Kyle Clunies-Ross, Rumelo Amor +4 more·Apr 1, 2026
Super-resolution microscopy is crucial for imaging sub-wavelength biological structures. However, most techniques rely on nonlinear saturation or stochastic switching of emitters, limiting imaging speed and increasing phototoxicity. Here, we achieve ...
Directly visualizing the energy level structure of quantum dot molecules
Heun Mo Yoo, Tanner M. Janda, Connor Nasseraddin +1 more·Mar 31, 2026
The orbital, spin and valley degrees of freedom in silicon quantum dots support many modes of spin qubit operation. However, it is generally challenging to obtain information about the energy level spectrum over large ranges of parameter space. We de...
Detection of quantum imaginarity using moments and its interferometric realization
Sudip Chakrabarty, Saheli Mukherjee, Ananda G. Maity +1 more·Mar 31, 2026
Complex numbers, intrinsic to the formulation of quantum theory, play a pivotal role in enabling advantages across a broad range of quantum information-processing tasks. Despite their fundamental importance, practical and scalable criteria for detect...
The Grothendieck Constant is Strictly Larger than Davie-Reeds' Bound
Chris Jones, Giulio Malavolta·Mar 31, 2026
The Grothendieck constant $K_{G}$ is a fundamental quantity in functional analysis, with important connections to quantum information, combinatorial optimization, and the geometry of Banach spaces. Despite decades of study, the value of $K_{G}$ is un...
Four Generations of Quantum Biomedical Sensors
Xin Jin, Priyam Srivastava, Ronghe Wang +7 more·Mar 31, 2026
Quantum sensing technologies offer transformative potential for ultra-sensitive biomedical sensing, yet their clinical translation remains constrained by classical noise limits and a reliance on macroscopic ensembles. We propose a unifying generation...