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The Hadamard parametrix on half-Minkowski with Robin boundary conditions: Fundamental solutions and Hadamard states
B. Costeri, C. Dappiaggi, B. A. Ju\'arez-Aubry, R. D. Singh
https://arxiv.org/abs/2509.26035

The Hadamard parametrix on half-Minkowski with Robin boundary conditions: Fundamental solutions and Hadamard states
We address the problem of constructing fundamental solutions and Hadamard states for a Klein-Gordon field in half-Minkowski spacetime with Robin boundary conditions in $d \geq 2$ spacetime dimensions. First, using a generalisation of the Robin-to-Dirichlet map exploited by Bondurant and Fulling [J. Phys. A: Math. Theor. {\bf 38} 7 (2005)] in dimension $2$, we obtain a representation for the advanced and retarded Green operators in terms of a convolution with the kernel of the inverse Robin-to-D…

dass sich Steinmeier als Architekt der Agenda 2010 nicht zu blöde ist, Heitmeyer das Bundesverdienstkreuz zu verleihen

The curious case of "XOR repetition" of monogamy-of-entanglement games
Andrea Coladangelo, Qipeng Liu, Ziyi Xie
https://arxiv.org/abs/2509.01831 https://

The curious case of "XOR repetition" of monogamy-of-entanglement games
In this work, we consider "decision" variants of a monogamy-of-entanglement game by Tomamichel, Fehr, Kaniewski, and Wehner [New Journal of Physics '13]. In its original "search" variant, Alice prepares a (possibly entangled) state on registers $\mathsf{ABC}$; register $\mathsf{A}$, consisting of $n$ qubits, is sent to a Referee, while $\mathsf{B}$ and $\mathsf{C}$ are sent to Bob and Charlie; the Referee then measures each qubit in the standard or Hadamard basis (chosen uniformly at random). T…

Recent developments in semiclassical gravity
Benito A. Ju\'arez-Aubry
https://arxiv.org/abs/2509.02051 https://arxiv.org/pdf/2509.02051

Recent developments in semiclassical gravity
Semiclassical gravity (SG) aims to describe the semiclassical regime of quantum gravity. In SG quantum fields curve classical spacetime in an effective way through the expectation value of their stress-energy tensor, while propagating in the spacetime they curve. I discuss some advances in SG in three directions: (i) in understanding structural properties or special solutions of SG in spacetimes with isometries or special Hadamard states (ii) in understanding the initial value formulation and (…

Crosslisted article(s) found for cs.CV. https://arxiv.org/list/cs.CV/new
[2/2]:
- A Fast and Precise Method for Searching Rectangular Tumor Regions in Brain MR Images
Hidenori Takeshima, Shuki Maruyama

A Fast and Precise Method for Searching Rectangular Tumor Regions in Brain MR Images
Hidenori Takeshima, Shuki Maruyama
https://arxiv.org/abs/2510.00505 https://

A Fast and Precise Method for Searching Rectangular Tumor Regions in Brain MR Images
Purpose: To develop a fast and precise method for searching rectangular regions in brain tumor images. Methods: The authors propose a new method for searching rectangular tumor regions in brain MR images. The proposed method consisted of a segmentation network and a fast search method with a user-controllable search metric. As the segmentation network, the U-Net whose encoder was replaced by the EfficientNet was used. In the fast search method, summed-area tables were used for accelerating sums…

Sandwich test for Quantum Phase Estimation
Avatar Tulsi
https://arxiv.org/abs/2507.23716 https://arxiv.org/pdf/2507.23716

Sandwich test for Quantum Phase Estimation
Quantum Phase Estimation (QPE) has potential for a scientific revolution through numerous practical applications like finding better medicines, batteries, materials, catalysts etc. Many QPE algorithms use the Hadamard test to estimate $\langle ψ|U^{k}|ψ\rangle$ for a large integer $k$ for an efficiently preparable initial state $|ψ\rangle$ and an efficiently implementable unitary operator $U$. The Hadamard test is hard to implement because it requires controlled applications o…

Measurement and preparation protocols for quantum field theory on curved spacetimes
Christopher J. Fewster
https://arxiv.org/abs/2508.21426 https://arxiv.o…

Measurement and preparation protocols for quantum field theory on curved spacetimes
In this conference proceedings contribution, I describe work in progress concerning two problems in the measurement theory of quantum fields. First, it is proved that all local observables can be obtained from local measurement schemes. Second, I describe a protocol for preparing a Hadamard local product state of given Hadamard states relative to the local algebras of specified spacelike separated regions.

Resource-Efficient Hadamard Test Circuits for Nonlinear Dynamics on a Trapped-Ion Quantum Computer
Eleftherios Mastorakis, Muhammad Umer, Milena Guevara-Bertsch, Juris Ulmanis, Felix Rohde, Dimitris G. Angelakis
https://arxiv.org/abs/2507.19250

Resource-Efficient Hadamard Test Circuits for Nonlinear Dynamics on a Trapped-Ion Quantum Computer
Resource-efficient, low-depth implementations of quantum circuits remain a promising strategy for achieving reliable and scalable computation on quantum hardware, as they reduce gate resources and limit the accumulation of noisy operations. Here, we propose a low-depth implementation of a class of Hadamard test circuits, complemented by the development of a parameterized quantum ansatz specifically tailored for variational algorithms that exploit the underlying Hadamard test framework. Our find…

Anticoherent $k$-planes and coding techniques for a 3-qubit scheme of universal quantum computing
L. Arag\'on-Mu\~noz, C. Chryssomalakos, A. G. Flores-Delgado, V. Rasc\'on-Barajas, I. V\'azquez Mota
https://arxiv.org/abs/2509.23464

Anticoherent $k$-planes and coding techniques for a 3-qubit scheme of universal quantum computing
Toponomic quantum computing (TQC) employs rotation sequences of anticoherent $k$-planes to construct noise-tolerant quantum gates. In this work, we demonstrate the implementation of generalized Toffoli gates, using $k$-planes of spin systems with $s \geq k + 1$, and of the Hadamard gate for a 3-qubit system, using a spin $s \!= \! 15$ 8-plane. We propose a universal quantum computing scheme for 3-qubit systems (via Hadamard + Toffoli gates) based on coding techniques. A key advantage of this co…