Papers
The Manipulate-and-Observe Attack on Quantum Key Distribution
William Tighe, George Brumpton, Mark Carney +1 more·Mar 31, 2026
Quantum key distribution is often regarded as an unconditionally secure method to exchange a secret key by harnessing fundamental aspects of quantum mechanics. Despite the robustness of key exchange, classical post-processing reveals vulnerabilities ...
Multipartite controlled-NOT gates using molecules and Rydberg atoms
Yi-Han Bai, Yue Wei, Chi Zhang +2 more·Mar 31, 2026
We propose high-fidelity controlled-NOT (CNOT) gates in a hybrid system of polar molecules and Rydberg atoms based on the unconventional Rydberg pumping mechanism. By combining the rich internal structure of polar molecules with the strong dipole-dip...
Change in bit-flip times of Kerr parametric oscillators caused by their interactions
Yuya Kano, Yohei Kawakami, Shumpei Masuda +8 more·Mar 31, 2026
We experimentally investigate how interactions between Kerr parametric oscillators (KPOs) degrade their bit-flip times, where a bit flip is defined as a transition between the two degenerate ground states of a KPO. Interactions between KPOs cause qua...
Calculating the quantum Fisher information via the truncated Wigner method
Thakur G. M. Hiranandani, Joseph J. Hope, Simon A. Haine·Mar 31, 2026
In this work, we propose new methods of parameter estimation using stochastic sampling quantum phase-space simulations. We show that it is possible to compute the quantum Fisher information (QFI) from semiclassical stochastic samples using the Trunca...
Quantum Fisher information in many-photon states from shift current shot noise
Evgenii Barts, Takahiro Morimoto, Naoto Nagaosa·Mar 31, 2026
Quantum Fisher information (QFI) sets the ultimate precision of optical phase measurements and reveals multiphoton entanglement, but it is not accessible with conventional photodetection. We theoretically predict that a photodetector utilizing the sh...
Remarks on "Further comments on "Rebuttal of "Refutation of "Comment on "Reply to "Comments on "A genuinely natural information measure" " " " " " "
Z. Sommer, A. Winter·Mar 30, 2026
It's a bit tedious, but as John Doe and Jean Roe have insisted on offering further comments on our comprehensive refutation of the former's already tiringly obstinate advances, we feel compelled to review their not even wrong opinions once again, hop...
Bell's Inequality, Causal Bounds, and Quantum Bayesian Computation: A Unified Framework
Nick Polson, Vadim Sokolov, Daniel Zantedeschi·Mar 30, 2026
Bell inequalities characterize the boundary of the local-realist correlation polytope -- the set of joint probability distributions achievable by classical hidden-variable models. Quantum mechanics exceeds this boundary through non-commutativity, rea...
Quantum Optical Neuron for Image Classification via Multiphoton Interference
Giorgio Minati, Simone Roncallo, Simone Scrofana +6 more·Mar 30, 2026
The rapid growth of machine learning is increasingly constrained by the energy and bandwidth limits of classical hardware. Optical and quantum technologies offer an alternative route, enabling high-dimensional, parallel information processing directl...
Construction and characterization of measures in block coherence resource theory
Xiangyu Chen, Qiang Lei·Mar 30, 2026
Quantum coherence, as a direct manifestation of the quantum superposition principle, is a crucial resource in quantum information processing. Block coherence resource theory generalizes the traditional coherence framework by defining coherence via a ...
Efficient and Practical Black-Box Verification of Quantum Metric Learning Algorithms
Ahmed Shokry, Movahhed Sadeghi, Mahmut Kandemir·Mar 30, 2026
Quantum metric learning enhances machine learning by mapping classical data to a quantum Hilbert space with maximal separation between classes. However, on current NISQ hardware, this mapping process itself is prone to errors and could be fundamental...
Mixed-register Stabilizer Codes: A Coding-theoretic Perspective
Himanshu Dongre, Lane G. Gunderman·Mar 30, 2026
Protecting information in systems that have more than two basis states (qudits) not only offers a promising route for reducing the number of individual quantum locations that must be protected, while more accurately reflecting the structure of realis...
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...
Resonance fluorescence of an artificial atom with a time-delayed coherent feedback
Ching-Yeh Chen, Gavin Crowder, Zheng-Qi Niu +7 more·Mar 30, 2026
The model of light-matter interaction in quantum electrodynamics typically relies on the Markovian approximation, which assumes that the system's future evolution depends solely on its current state, effectively treating it as a ``memoryless" process...
Hybrid QPE-Ansatz Strategy for Reliable Excited-State Variational Quantum Deflation
Young Kyun Ahn, Young Min Rhee·Mar 30, 2026
We introduce a spin $z$-component ($S_{z}$) conserving symmetry-preserving ansatz and a shallow quantum phase estimation (QPE) routine of spin $x$ ($S_x$), and combine them into a spin-filtering variational quantum deflation (sfVQD) scheme for noisy ...
Exponentially cheaper coherent phase estimation via uncontrolled unitaries
Mirko Amico·Mar 29, 2026
Phase kickback is a fundamental primitive that is used in many quantum algorithms, such as quantum phase estimation. Here we observe that by using information about the controlled unitary, we can replace the controlled unitary with an uncontrolled on...
A Resource-Aligned Hybrid Quantum-Classical Framework for Multimodal Face Anti-Spoofing
Wanqi Sun, Jungang Xu, Chenghua Duan·Mar 29, 2026
Embedding high-dimensional data into resource-limited quantum devices remains a significant challenge for practical quantum machine learning. In multimodal face anti-spoofing, while linear compression methods such as principal component analysis can ...
The resource theory of interactive quantum instruments
Chung-Yun Hsieh, Armin Tavakoli, Huan-Yu Ku +1 more·Mar 29, 2026
Quantum instruments describe both the classical output and the updated quantum state in a measurement process. To do this in a non-trivial way, instruments must have the capability to interact coherently with the state that they measure. Here, we dev...
Quantum control and signal enhancement exploiting the Stokes-anti-Stokes coherence
Wen-Zhao Zhang, Keye Zhang, Jie Li·Mar 29, 2026
We present a theoretical framework for the coherent coupling between Stokes and anti-Stokes scattering processes, revealing interference phenomena inaccessible to either process alone. Within a dispersive-interaction model beyond the resolved-sideban...
A Schrödinger-like equation for the Thermodynamics of a particle in a box
Adrian Faigon·Mar 29, 2026
The particle in an expanding/contracting 1-dimension box is revisited in action-angle like variables with direct thermodynamic interpretation. An angle dependent potential is proposed accurately describing the mechanical behavior while also capturing...
Differential source-basis encoding for superresolved parameter estimation in a time-reversed Young interferometer
Jianming Wen·Mar 28, 2026
We develop a differential source-encoding protocol for local parameter estimation in a time-reversed Young interferometer, where the source plane is used not merely as a scan coordinate but as a programmable measurement basis. Two sequential positive...