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Daily Quantum Computing Research & News • November 30, 2025 • 04:17 CST

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📊 Today's Data Collection

Highlights: 3 top items selected
News items: 10 articles gathered
Technology papers: 10 papers fetched
Company papers: 8 papers from major players
Highlighted papers: 5 papers collected
Total sources: 6 data feeds processed

🌟 Highlights

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📰 News Items

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📄 Technology Papers

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In-situ mid-circuit qubit measurement and reset in a single-species trapped-ion quantum computing system

Yichao Yu, Keqin Yan, Debopriyo Biswas, Vivian Ni Zhang, Bahaa Harraz, Crystal Noel, Christopher Monroe, Alexander Kozhanov • Published: 2025-04-17
We implement in-situ mid-circuit measurement and reset (MCMR) operations on a trapped-ion quantum computing system by using metastable qubit states in $^{171}\textrm{Yb}^+$ ions. We introduce and compare two methods for isolating data qubits from measured qubits: one shelves the data qubit into the metastable state and the other drives the measured qubit to the metastable state without disturbing ...

Computing the graph-changing dynamics of loop quantum gravity

Thiago L. M. Guedes, Guillermo A. Mena Marugán, Francesca Vidotto, Markus Müller • Published: 2024-12-28
In loop quantum gravity (LQG), states of the gravitational field are represented by labeled graphs called spin networks. Their dynamics can be described by a Hamiltonian constraint, { which acts on the spin network states modifying both spins and graphs.} Fixed-graph approximations of the dynamics have been extensively studied, but its full graph-changing action so far remains elusive. The latter,...

Accelerating Fault-Tolerant Quantum Computation with Good qLDPC Codes

Guo Zhang, Yuanye Zhu, Ying Li • Published: 2025-10-22
We propose a fault-tolerant quantum computation scheme that is broadly applicable to quantum low-density parity-check (qLDPC) codes. The scheme achieves constant qubit overhead and a time overhead of $O(d^{a+o(1)})$ for any $[[n,k,d]]$ qLDPC code with constant encoding rate and distance $d = Ω(n^{1/a})$. For good qLDPC codes, the time overhead is minimized and reaches $O(d^{1+o(1)})$. In contrast,...

Opportunities and Challenges of Computational Electromagnetics Methods for Superconducting Circuit Quantum Device Modeling: A Practical Review

Samuel T. Elkin, Ghazi Khan, Ebrahim Forati, Brandon W. Langley, Dogan Timucin, Reza Molavi, Sara Sussman, Thomas E. Roth • Published: 2025-11-25
High-fidelity numerical methods that model the physical layout of a device are essential for the design of many technologies. For methods that characterize electromagnetic effects, these numerical methods are referred to as computational electromagnetics (CEM) methods. Although the CEM research field is mature, emerging applications can still stress the capabilities of the techniques in use today....

Quantum block Krylov subspace projector algorithm for computing low-lying eigenenergies

Maria Gabriela Jordão Oliveira, Nina Glaser • Published: 2025-06-11
Computing eigenvalues is a computationally intensive task central to numerous applications in the natural sciences. Toward this end, we investigate the quantum block Krylov subspace projector (QBKSP) algorithm - a multireference quantum Lanczos method designed to accurately compute low-lying eigenenergies, including degenerate ones, of quantum systems. We present three compact quantum circuits tai...

Error-structure-tailored early fault-tolerant quantum computing

Pei Zeng, Guo Zheng, Qian Xu, Liang Jiang • Published: 2025-11-25
Fault tolerance is widely regarded as indispensable for achieving scalable and reliable quantum computing. However, the spacetime overhead required for fault-tolerant quantum computating remains prohibitively large. A critical challenge arises in many quantum algorithms with Clifford + $\varphi$ compiling, where logical rotation gates $R_{Z_L}(\varphi)$ serve as essential components. The Eastin-Kn...

High-Order Splitting of Non-Unitary Operators on Quantum Computers

Peter Brearley, Philipp Pfeffer • Published: 2025-11-24
We present a high-order splitting method for simulating non-unitary dynamics by sequential real- and imaginary-time Hamiltonian evolutions. Complex-coefficient splitting methods with positive real parts are chosen for stable integration in a quantum circuit, avoiding the unstable, norm-amplifying negative steps that arise from real-coefficient splitting at high orders. The method is most beneficia...

Berry's phase on photonic quantum computers

Steven Abel, Iwo Wasek, Simon Williams • Published: 2025-11-24
We formulate a continuous-variable quantum computing (CVQC) algorithm to study Berry's phase on photonic quantum computers. We demonstrate that CVQC allows the simulation of charged particles with orbital angular momentum under the influence of an adiabatically changing $\vec{B}$ field. Although formulated entirely in the CVQC setting, our construction uses only passive linear-optical operations (...

An efficient quantum algorithm for computing $S$-units and its applications

Jean-Francois Biasse, Fang Song • Published: 2025-10-02
In this paper, we provide details on the proofs of the quantum polynomial time algorithm of Biasse and Song (SODA 16) for computing the $S$-unit group of a number field. This algorithm directly implies polynomial time methods to calculate class groups, S-class groups, relative class group and the unit group, ray class groups, solve the principal ideal problem, solve certain norm equations, and dec...

Quantum Search on Computation Trees

Jevgēnijs Vihrovs • Published: 2025-05-28
We show a simple generalization of the quantum walk algorithm for search in backtracking trees by Montanaro (ToC 2018) to the case where vertices can have different times of computation. If a vertex $v$ in the tree of depth $D$ is computed in $t_v$ steps from its parent, then we show that detection of a marked vertex requires $\text{O}(\sqrt{TD})$ queries to the steps of the computing procedures, ...

🏢 Company Papers

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Holographically Emergent Gauge Theory in Symmetric Quantum Circuits

Akash Vijay, Jong Yeon Lee • Published: 2025-11-26
We develop a novel holographic framework for mixed-state phases in random quantum circuits, both unitary and non-unitary, with a global symmetry $G$. Viewing the circuit as a tensor network, we decompose it into two parts: a symmetric layer, which defines an emergent gauge wavefunction in one higher dimension, and a random non-symmetric layer, which consists of random multiplicity tensors. For uni...

In-situ mid-circuit qubit measurement and reset in a single-species trapped-ion quantum computing system

Yichao Yu, Keqin Yan, Debopriyo Biswas, Vivian Ni Zhang, Bahaa Harraz, Crystal Noel, Christopher Monroe, Alexander Kozhanov • Published: 2025-04-17
We implement in-situ mid-circuit measurement and reset (MCMR) operations on a trapped-ion quantum computing system by using metastable qubit states in $^{171}\textrm{Yb}^+$ ions. We introduce and compare two methods for isolating data qubits from measured qubits: one shelves the data qubit into the metastable state and the other drives the measured qubit to the metastable state without disturbing ...

EvilGenie: A Reward Hacking Benchmark

Jonathan Gabor, Jayson Lynch, Jonathan Rosenfeld • Published: 2025-11-26
We introduce EvilGenie, a benchmark for reward hacking in programming settings. We source problems from LiveCodeBench and create an environment in which agents can easily reward hack, such as by hardcoding test cases or editing the testing files. We measure reward hacking in three ways: held out unit tests, LLM judges, and test file edit detection. We verify these methods against human review and ...

A Low Cost Relativistic Algebraic Diagrammatic Construction Method Based on Cholesky Decomposition and Frozen Natural Spinors for Electronic Ionization, Attachment and Excitation Energy Problem

Sudipta Chakraborty, Kamal Majee, Achintya Kumar Dutta • Published: 2025-11-26
We present an efficient relativistic implementation of the algebraic diagrammatic construction (ADC) theory up to third order, incorporating Cholesky decomposition (CD) and frozen natural spinor (FNS) techniques to address electronic ionization, attachment, and excitation problems in heavy-element systems. The exact two-component atomic mean-field (X2CAMF) Hamiltonian has been employed to balance ...

Lazy Quantum Walks with Native Multiqubit Gates

Steph Foulds, Viv Kendon • Published: 2025-11-26
Quantum walks, the quantum analogue to the classical random walk, have been shown to model fluid dynamics. Neutral atom hardware is a promising choice of platform for implementing quantum walks due to its ability to implement native multiqubit ($\geq\!3$-qubit) gates and to dynamically re-arrange qubits. Using error modelling for multiqubit Rydberg gates via two-photon adiabatic rapid passage, we ...

Modeling and Optimizing Performance Bottlenecks for Neuromorphic Accelerators

Jason Yik, Walter Gallego Gomez, Andrew Cheng, Benedetto Leto, Alessandro Pierro, Noah Pacik-Nelson, Korneel Van den Berghe, Vittorio Fra, Andreea Danielescu, Gianvito Urgese, Vijay Janapa Reddi • Published: 2025-11-26
Neuromorphic accelerators offer promising platforms for machine learning (ML) inference by leveraging event-driven, spatially-expanded architectures that naturally exploit unstructured sparsity through co-located memory and compute. However, their unique architectural characteristics create performance dynamics that differ fundamentally from conventional accelerators. Existing workload optimizatio...

A nanoparticle stored with an atomic ion in a linear Paul trap

Dmitry S. Bykov, Lorenzo Dania, Florian Goschin, Tracy E. Northup • Published: 2024-03-04
Radiofrequency (RF) traps enable highly controlled interactions between charged particles, including reactions between cold molecular ions, sympathetic cooling of one ion species with another, and quantum logic spectroscopy. However, the charge-to-mass ($Q/m$) selectivity of RF traps limits the range of objects that can be confined simultaneously in the same trap. Here, we confine two particles - ...

AI-Designed Photonics Gratings with Experimental Verification

Yu Dian Lim, Chuan Seng Tan • Published: 2025-11-25
Artificial Intelligence (AI) software based on transformer model is developed to automatically design gratings for possible integrations in ion traps to perform optical addressing on ions. From the user-defined (x,z) coordinates and full-width half-maximum (FWHM) values, the AI software can automatically generate the Graphic Design System (GDS) layout of the grating that shoots light towards the p...

📚 Highlighted Papers

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Quantum enhanced Monte Carlo simulation for photon interaction cross sections

Authors: Euimin Lee, Sangmin Lee, Shiho Kim • Submitted: Submitted • arXiv: arXiv:2502.14374
Abstract: …as the dominant attenuation mechanism, we demonstrate that our approach reproduces classical probability distributions with high fidelity. Simulation results obtained via the IBM Qiskit quantum simulator reveal a quadratic speedup in amplitude estimation compared to conventional Monte C...

Time-adaptive single-shot crosstalk detector on superconducting quantum computer

Authors: Haiyue Kang, Benjamin Harper, Muhammad Usman, Martin Sevior • Submitted: Submitted • arXiv: arXiv:2502.14225
Abstract: …in two scenarios: simulation using an artificial noise model with gate-induced crosstalk and always-on idlings channels; and the simulation using noise sampled from an IBM quantum computer parametrised by the reduced HSA error model. The presented results show our method's efficacy hing...

Quantum simulation of a qubit with non-Hermitian Hamiltonian

Authors: Anastashia Jebraeilli, Michael R. Geller • Submitted: Submitted • arXiv: arXiv:2502.13910
Abstract: …-broken regime surrounding an exceptional point. Quantum simulations are carried out using IBM superconducting qubits. The results underscore the potential for variational quantum circuits and machine learning to push the boundaries of quantum simulation, offering new methods for explor...

Comment on "Energy-speed relationship of quantum particles challenges Bohmian mechanics"

Aurélien Drezet, Dustin Lazarovici, Bernard Michael Nabet
In their recent paper [Nature 643, 67 (2025)], Sharaglazova et al. report an optical microcavity experiment yielding an "energy-speed relationship" for quantum particles in evanescent states, which they infer from the observed population transfer between two coupled waveguides. The authors argue tha...