22 citations · 49 across the 10 of their papers we have counts for
10 papers
Thermal Quantum Sensing: Fisher Information and Work Beyond Gaussian Signals
Yash Chitgopekar, Nikolaos Koukoulekidis, Iman Marvian
Understanding how thermal fluctuations modify or suppress quantum-enhanced sensing is a central problem in quantum metrology. Closely related questions arise in quantum thermodynam…
Symmetry and Asymmetry in Bosonic Gaussian Systems: A Resource-Theoretic Framework
Nikolaos Koukoulekidis, Iman Marvian
We study the interplay of symmetries and Gaussianity in bosonic systems, under closed and open dynamics, and develop a resource theory of Gaussian asymmetry. Specifically, we focus…
Majorization theory for quasiprobabilities
Twesh Upadhyaya, Zacharie Van Herstraeten, Jack Davis +3
The question of how to characterize disorder arises in a wide variety of settings, including information theory, economics, and quantum thermodynamics. The theory of majorization p…
Small Quantum Codes from Algebraic Extensions of Generalized Bicycle Codes
Nikolaos Koukoulekidis, Fedor Šimkovic, Martin Leib +1
Quantum error correction is rapidly seeing first experimental implementations, but there is a significant gap between asymptotically optimal error-correcting codes and codes that a…
A framework of partial error correction for intermediate-scale quantum computers
Nikolaos Koukoulekidis, Samson Wang, Tom O'Leary +3
As quantum computing hardware steadily increases in qubit count and quality, one important question is how to allocate these resources to mitigate the effects of hardware noise. In…
General entropic constraints on CSS codes within magic distillation protocols
Rhea Alexander, Si Gvirtz-Chen, Nikolaos Koukoulekidis +1
Magic states are fundamental building blocks on the road to fault-tolerant quantum computing. CSS codes play a crucial role in the construction of magic distillation protocols. Pre…
Faster Born probability estimation via gate merging and frame optimisation
Nikolaos Koukoulekidis, Hyukjoon Kwon, Hyejung H. Jee +2
Outcome probability estimation via classical methods is an important task for validating quantum computing devices. Outcome probabilities of any quantum circuit can be estimated us…
Constraints on magic state protocols from the statistical mechanics of Wigner negativity
Nikolaos Koukoulekidis, David Jennings
Magic states are key ingredients in schemes to realize universal fault-tolerant quantum computation. Theories of magic states attempt to quantify this computational element via mon…
The geometry of passivity for quantum systems and a novel elementary derivation of the Gibbs state
Nikolaos Koukoulekidis, Rhea Alexander, Thomas Hebdige +1
Passivity is a fundamental concept that constitutes a necessary condition for any quantum system to attain thermodynamic equilibrium, and for a notion of temperature to emerge. Whi…
Characterisation of multi-level quantum coherence without ideal measurements
Benjamin Dive, Nikolaos Koukoulekidis, Stefanos Mousafeiris +1
Coherent superpositions are one of the hallmarks of quantum mechanics and are vital for any quantum mechanical device to outperform the classically achievable. Generically, superpo…