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Paper 1

Absolute Coherence - Resonance over Resistance — a Conceptual Framework for Quantum Technologies

Hakan Henken

Year

2026

Journal

Zenodo (CERN European Organization for Nuclear Research)

DOI

10.5281/zenodo.18843028

arXiv

-

This essay proposes 'Absolute Coherence' as a design principle that treatsdecoherence not as loss, but as a context-dependent modulation of an ever-presentcoherent ground state. In contrast to conventional quantum error correction, thisapproach motivates passive, integrative strategies that treat coherence as the defaultcondition. Drawing on a concrete technical proposal (phononic bandgaps combinedwith decoherence-free subspaces in NV-center ensembles), it is argued that thisperspective may address key scaling bottlenecks in quantum computing — inparticular the reliance on millikelvin cooling and active error correction. The essayclearly distinguishes analogy from isomorphism and invites interdisciplinarydiscussion.

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Paper 2

Tradeoffs on the volume of fault-tolerant circuits

Anirudh Krishna, Gilles Zémor

Year

2025

Journal

arXiv preprint

DOI

arXiv:2510.03057

arXiv

2510.03057

Dating back to the seminal work of von Neumann [von Neumann, Automata Studies, 1956], it is known that error correcting codes can overcome faulty circuit components to enable robust computation. Choosing an appropriate code is non-trivial as it must balance several requirements. Increasing the rate of the code reduces the relative number of redundant bits used in the fault-tolerant circuit, while increasing the distance of the code ensures robustness against faults. If the rate and distance were the only concerns, we could use asymptotically optimal codes as is done in communication settings. However, choosing a code for computation is challenging due to an additional requirement: The code needs to facilitate accessibility of encoded information to enable computation on encoded data. This seems to conflict with having large rate and distance. We prove that this is indeed the case, namely that a code family cannot simultaneously have constant rate, growing distance and short-depth gadgets to perform encoded CNOT gates. As a consequence, achieving good rate and distance may necessarily entail accepting very deep circuits, an undesirable trade-off in certain architectures and applications.

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