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quant-ph2026

Towards fault-tolerance with universal phase-error-transparent gates for high-spin cat codes

Kelvin Onggadinata, Si Yan Koh, Arghya Maity +5

High-dimensional nuclear spins offer a hardware-efficient route to quantum error correction (QEC), with the spin cat code providing intrinsic robustness against phase errors -- the…

quant-ph2026

Exact Tradeoff Between Quantum Error Correction and Quantum Darwinism: An Information-Theoretic No-Go Theorem

Arghya Maity, Kelvin Onggadinata, Teck Seng Koh

Quantum error correction (QEC) and Quantum Darwinism describe opposing consequences of system-environment interactions: QEC seeks to preserve logical quantum information, whereas Q…

quant-ph2026

Efficient measure of information backflow with a quasistochastic process

Kelvin Onggadinata, Teck Seng Koh

Characterization and quantification of non-Markovian dynamics in open quantum systems are topical issues in the rapidly developing field of quantum computation and quantum communic…

quant-ph2026

Non-Markovian and Thermodynamic Signatures in the Classicality Assessment via Kolmogorov Consistency

Arghya Maity, Ahana Ghoshal, Kelvin Onggadinata +1

The Kolmogorov consistency condition (KCC) defines the statistical boundary between classical and quantum dynamics. Its violation signifies the breakdown of a classical Markov desc…

quant-ph2025

Quantum Sensing Enhancement through a Nuclear Spin Register in Nitrogen-Vacancy Centers in Diamond

Jonathan Kenny, Feifei Zhou, Ruihua He +3

Quantum sensing has seen rapid progress from laboratory research to real-world applications. Solid-state spin systems, particularly nitrogen-vacancy (NV) centers in diamond, are at…

quant-ph2024

Robust Nuclear Spin Polarization via Ground-State Level Anti-Crossing of Boron Vacancy Defects in Hexagonal Boron Nitride

Shihao Ru, Zhengzhi Jiang, Haidong Liang +14

Nuclear spin polarization plays a crucial role in quantum information processing and quantum sensing. In this work, we demonstrate a robust and efficient method for nuclear spin po…