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Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Efficient Hamiltonian-aware Quantum Natural Gradient Descent for Variational Quantum Eigensolvers
Chenyu Shi, Hao Wang·Nov 18, 2025
The Variational Quantum Eigensolver (VQE) is one of the most promising algorithms for current quantum devices. It employs a classical optimizer to iteratively update the parameters of a variational quantum circuit in order to search for the ground st...
Coherent regime of Kapitza-Dirac effect with electrons
Kamila Moriová, Petr Koutenský, Neli Laštovičková Streshkova +5 more·Nov 18, 2025
Electron matter waves coherently diffract when passing through a periodic structure of light formed by two interfering light waves. In this so-called Kapitza-Dirac effect, the electron momentum changes due to absorption and emission of photons via st...
Simulating quantum electrodynamics in 2+1 dimensions with qubits and qumodes
Victor Ale, Tommaso Rainaldi, Enrique Rico +2 more·Nov 18, 2025
We develop a hybrid qubit-qumode framework for simulating quantum electrodynamics in 2+1 dimensions. In this approach, fermionic matter fields are represented by qubits, while U(1) gauge fields are encoded in continuous-variable bosonic modes whose c...
Self-interacting quantum particles and the Dirac delta potential
Sergio Giardino·Nov 18, 2025
The Dirac delta function potential is considered within the real Hilbert space approach for complex wave functions, as well as quaternionic wave functions. As has been previously determined, the real Hilbert space approach enables the possibility of ...
Explicit block-encoding for partial differential equation-constrained optimization
Yuki Sato, Jumpei Kato, Hiroshi Yano +2 more·Nov 18, 2025
Partial differential equation (PDE)-constrained optimization, where an optimization problem is subject to PDE constraints, arises in various applications such as design, control, and inference. Solving such problems is computationally demanding becau...
Lecture Notes on Information Scrambling, Quantum Chaos, and Haar-Random States
Marcin Płodzień·Nov 18, 2025
Information scrambling, the process by which quantum information spreads and becomes effectively inaccessible, is central to modern quantum statistical physics and quantum chaos. These lecture notes provide an introduction to information scrambling f...
Quantum speed-ups for solving semidefinite relaxations of polynomial optimization
Daniel Stilck França, Ngoc Hoang Anh Mai·Nov 18, 2025
We study quantum algorithms for approximating Lasserre's hierarchy values for polynomial optimization. Let $f,g_1,\ldots,g_m$ be real polynomials in $n$ variables and $f^\star$ the infimum of $f$ over the semialgebraic set $S(g)=\{x: g_i(x)\ge 0\}$. ...
Robust Two-Qubit Geometric Phase Gates using Amplitude and Frequency Ramping
Christina Bowers, Deviprasath Palani, John Barta +4 more·Nov 18, 2025
We demonstrate a method for generating entanglement between trapped atomic ions based on adiabatically ramped state-dependent forces. By ramping both the amplitude of the state-dependent force and the motional mode frequencies, we realize an entangli...
Quantum Biology, Quantum Simulation and Quantum Coherent Devices
Rong-Hang Chen, Jing Dong, Wen Yang +2 more·Nov 18, 2025
Many living organisms can exploit quantum mechanical effects to gain distinct biological advantages. In plants, photosynthesis uses quantum coherence to achieve near 100% efficiency in energy transfer. With advances in experimental techniques, two-di...
Quantum Circuit Model of Black Hole Evaporation with Controlled Causal Leakage
Sourav Ballav, Chi-Hsien Tai, Wen-Yu Wen·Nov 18, 2025
We extend a four-qubit quantum circuit model of black hole evaporation that enforces semi-causality, a condition that allows information to enter a black hole but strictly forbids any information from escaping from the interior to outside through the...
Compiler design for hardware specific decomposition optimizations, tailored to diamond NV centers
Folkert de Ronde, Stephan Wong, Sebastian Feld·Nov 18, 2025
Advances in quantum algorithms as well as in control hardware designs are continuously being made. These quantum algorithms, expressed as quantum circuits, need to be translated to a set of instructions from a defined quantum instruction-set architec...
Parallelizing Program Execution on Distributed Quantum Systems via Compiler/Hardware Co-Design
Folkert de Ronde, Alexander Knapen, Stephan Wong +1 more·Nov 18, 2025
As quantum computers continue to improve and support larger, more complex computations, smart control hardware and compilers are needed to efficiently leverage the capabilities of these systems. This paper introduces a novel approach to enhance the e...
Empirical Quantum Advantage in Constrained Optimization from Encoded Unitary Designs
Chinonso Onah, Roman Firt, Kristel Michielsen·Nov 18, 2025
We introduce the Constraint-Enhanced Quantum Approximate Optimization Algorithm (CE-QAOA), a shallow, constraint-aware ansatz that operates inside the one-hot product space [n]^m, where m is the number of blocks and each block is initialized in an n-...
Generating spatially separated correlated multiphoton states in nonlinear waveguide quantum electrodynamics
Jia-Qi Li, Anton Frisk Kockum, Xin Wang·Nov 18, 2025
Strongly correlated multi-photon states are indispensable resources for advanced quantum technologies, yet their deterministic generation remains challenging due to the inherent weak nonlinearity in most optical systems. Here, we propose a scalable a...
Semi-device-independent channel identification with communication matrices
Samgeeth Puliyil, Leevi Leppäjärvi, Mário Ziman·Nov 18, 2025
We look into the task of differentiating between any two quantum channels and reconstructing them from the obtained measurement statistics with possibly limited information about the experimental set-up. We employ the communication matrix formalism w...
Current Switching of Topological Spin Chirality in the van der Waals Antiferromagnet Co1/3TaS2
Kai-Xuan Zhang, Seungbok Lee, Woonghee Cho +1 more·Nov 18, 2025
Magnetic topology is central to modern quantum magnet, where spin chirality governs exotic spin winding, real-space Berry phase, and topological Hall effect. A key unresolved challenge is how to electrically switch topological spin chirality and its ...
Entropic uncertainty under indefinite causal order and input-output direction
Göktuğ Karpat·Nov 18, 2025
Entropic uncertainty relations quantify the limits on the predictability of quantum measurements. When the measured system is correlated with a quantum memory, these limits are described by the memory-assisted entropic uncertainty relation (MA-EUR). ...
Spectrotemporal processing in a dual gradient echo and electromagnetically-induced transparency memory
Jesse L Everett·Nov 18, 2025
Spectrotemporal encoding of optical quantum information is emerging as a powerful tool in quantum information technology. Processing of spectrotemporal information has recently been demonstrated in multi-mode quantum memories, based on extensions to ...
Canonical quantization for Equilibrium Thermodynamics
Luis F. Santos, Victor Hugo M. Ramos, Danilo Cius +2 more·Nov 18, 2025
We formulate a canonical quantization of Equilibrium Thermodynamics by applying Dirac's theory of constrained systems. Thermodynamic variables are treated as conjugate pairs of coordinates and momenta, allowing extensive and intensive quantities to b...
Dynamics of entanglement asymmetry for space-inversion symmetry of free fermions on honeycomb lattices
Ryogo Hara, Shimpei Endo, Shion Yamashika·Nov 18, 2025
We study the entanglement asymmetry for the space-inversion symmetry of free fermions on a two-dimensional honeycomb lattice with an on-site energy imbalance between the two sublattices. We show that the entanglement asymmetry of a local subsystem ex...