Papers
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...
Spin--valley--resolved tunneling through magnetic barriers in WSe$_2$
Rachid El Aitouni, Clarence Cortes, David Laroze +1 more·Mar 28, 2026
We investigate the influence of a magnetic field on the electronic properties of WS$e_2$ with a focus on spin-orbit coupling, spin and valley polarization, and conductance. We solve the eigenvalue equation analytically and use the continuity equation...
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....
Quantum-enhanced estimation of signal field amplitudes with critical squeezed states of photonic modes
Ken Chen, Jia-Hao Lv, Wen Ning +2 more·Mar 28, 2026
Critical phenomena of quantum systems offer a promising strategy to improve measurement precision. So far, many criticality-enhanced quantum metrological schemes have been proposed by using the adiabatically evolved photonic states of composite syste...
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...
Information-Theoretic Solutions for Seedless QRNG Bootstrapping and Hybrid PQC-QKD Key Combination
Juan Antonio Vieira Giestinhas, Timothy Spiller·Mar 27, 2026
This paper considers two challenges faced by practical quantum networks: the bootstrapping of seedless Quantum Random Number Generators (QRNGs) and the resilient combination of Post-Quantum Cryptography (PQC) and Quantum Key Distribution (QKD) keys. ...
Ergodicity breaking in matrix-product-state effective Hamiltonians
Andrew Hallam, Jared Jeyaretnam, Zlatko Papić·Mar 27, 2026
Thermalization and its breakdown in interacting quantum many-body systems are governed by mid-spectrum eigenstates, which are typically accessible only in small system sizes amenable to exact diagonalization. Here we demonstrate that the density-matr...
Gigahertz-clocked Generation of Highly Indistinguishable Photons at C-band Wavelengths
Robert Behrends, Lucas Rickert, Nils D. Kewitz +9 more·Mar 27, 2026
High-performance single-photon sources at telecom C-band wavelentghs are key building blocks for applications in long-distance quantum communication. Here, we report the generation of highly indistinguishable, single photons at a clock-rate of 2.5 GH...
Majorana-XYZ subsystem code
Tobias Busse, Lauri Toikka·Mar 27, 2026
We present a new type of a quantum error correction code, termed Majorana-XYZ code, where the logical quantum information scales macroscopically yet is protected by topologically non-trivial degrees of freedom. It is a $[n,k,g,d]$ subsystem code with...
Non-linear Sigma Model for the Surface Code with Coherent Errors
Stephen W. Yan, Yimu Bao, Sagar Vijay·Mar 26, 2026
The surface code is a promising platform for a quantum memory, but its threshold under coherent errors remains incompletely understood. We study maximum-likelihood decoding of the square-lattice surface code in the presence of single-qubit unitary ro...
Robust continuous-variable multipartite entanglement in circular arrays of nonlinear waveguides
Sugar Singh Meena, David Barral, Ankan Das Roy +2 more·Mar 26, 2026
Encoding continuous-variable quantum information in the optical domain has recently enabled the generation of large entangled states, yet robust implementation remains a challenge. Here, we present a straightforward protocol for generating multiparti...
Send the Key in Cleartext: Halving Key Consumption while Preserving Unconditional Security in QKD Authentication
Claudia De Lazzari, Francesco Stocco, Edoardo Signorini +7 more·Mar 26, 2026
Quantum Key Distribution (QKD) protocols require Information-Theoretically Secure (ITS) authentication of the classical channel to preserve the unconditional security of the distilled key. Standard ITS schemes are based on one-time keys: once a key i...
Mass-correction-induced enhancement of quantum correlations even beyond entanglement in the $e^{+}e^{-} \rightarrow J/ψ\rightarrow Λ(pπ^{-}) \barΛ(\bar{p}π^{+})$ process at the BESIII experiment under memory effects
Elhabib Jaloum, Omar Bachain, Mohamed Amazioug +4 more·Mar 26, 2026
In this work, we derive the bipartite density matrix for the $e^{+}e^{-} \rightarrow J/ψ\rightarrow Λ(pπ^{-}) \barΛ(\bar{p}π^{+})$ process at BESIII. We evaluate the impact of mass corrections and memory effects (within Markovian and non-Markovian re...
Exceptional-point-constrained locking of boundary-sensitive topological transitions in non-Hermitian lattices
Huimin Wang, Yanxin Liu, Zhihao Xu +1 more·Mar 26, 2026
Point-gap topology under periodic boundary conditions and line-gap topology under open boundary conditions are generally inequivalent in non-Hermitian systems. We show that, in chiral non-Hermitian lattices, these two boundary-sensitive topological t...
A counterexample to the strong spin alignment conjecture
Zhiwei Song, Lin Chen·Mar 26, 2026
The spin alignment conjecture was originally formulated in connection with the additivity of coherent information for a class of quantum channels known as platypus channels. Recently, a stronger majorization-based version was proposed by M. A. Alhejj...
Optimizing Entanglement Distribution Protocols: Maximizing Classical Information in Quantum Networks
Ethan Sanchez Hidalgo, Diego Zafra Bono, Guillermo Encinas Lago +3 more·Mar 26, 2026
Efficient entanglement distribution is the foundational challenge in realizing large-scale Quantum Networks. However, state-of-the-art solutions are frequently limited by restrictive operational assumptions, prohibitive computational complexities, an...
Causality is rare: some topological properties of causal quantum channels
Robin Simmons·Mar 26, 2026
Sorkin's impossible operations demonstrate that causality of a quantum channel in QFT is an additional constraint on quantum operations above and beyond the locality of the channel. What has not been shown in the literature so far is how much of a co...
CSI-tuples-based 3D Channel Fingerprints Construction Assisted by MultiModal Learning
Chenjie Xie, Li You, Ruirong Chen +2 more·Mar 26, 2026
Low-altitude communications can promote the integration of aerial and terrestrial wireless resources, expand network coverage, and enhance transmission quality, thereby empowering the development of sixth-generation (6G) mobile communications. As an ...
High-Fidelity Quantum State Transfer in Multimode Resonators via Tunable Pulses
Yuanning Chen, Xinxin Yang, Simon Gröblacher·Mar 26, 2026
Quantum state transfer between distant nodes is essential for distributed quantum information processing. Existing protocols are typically optimized for specific coupling regimes, such as adiabatic dark-state transfer in the single-mode limit and pit...
Variance Based Transmitter Localization in Vessel-Like Molecular Communication Channels
Dağhan Erdönmez, H. Birkan Yilmaz·Mar 26, 2026
Transmitter localization in vessel-like molecular communication channels is a fundamental problem with potential applications in healthcare. Existing analytical solutions either assume knowledge of emission time or require multiple closely spaced rec...