Theory of quantum systems

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Tensor network approaches for plasma dynamics

(2025)

Authors:

Ryan JJ Connor, Preetma Soin, Callum W Duncan, Andrew J Daley
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Geometry-driven transitions in sparse long-range spin models with cold atoms

(2025)

Authors:

Alex Gunning, Aydin Deger, Sridevi Kuriyattil, Andrew J Daley
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Universal Quantum Computation via Scalable Measurement-Free Error Correction

PRX Quantum American Physical Society (APS) 6:4 (2025) 040337

Authors:

Stefano Veroni, Alexandru Paler, Giacomo Giudice

Abstract:

We show that universal quantum computation can be concretely made fault-tolerant without mid-circuit measurements. To this end, we introduce a measurement-free deformation protocol of the Bacon-Shor code to realize a logical gate. Combined with a fold-transversal logical Hadamard gate, this enables a universal set of fault-tolerant operations using only transversal gates and qubit permutations. For the purpose of benchmarking under circuit-level noise, we develop an efficient method to simulate non-Clifford circuits with a small number of Hadamard gates. Separately, we demonstrate that certain CSS codes can be concatenated without measurements or having to rely on a universal logical gate set. This is made possible by means of a resource-efficient gadget—termed the “disposable Toffoli gadget”—that realizes the error-correcting feedback. Then, under concatenation of the Bacon-Shor code, we observe a fault-tolerance threshold at a circuit-level depolarizing noise rate of approximately 0.12 % . Together, the deformation and concatenation protocols outline a blueprint for a fully fault-tolerant architecture without any feed-forward operation, particularly suited to state-of-the-art neutral-atom platforms.
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Dissipation engineering of fermionic long-range order beyond Lindblad

(2025)

Authors:

Silvia Neri, Franà ois Damanet, Andrew J Daley, Marialuisa Chiofalo, Jorga Yago Malo

Tensor network methods for the Gross-Pitaevskii equation on fine grids

(2025)

Authors:

Ryan JJ Connor, Callum W Duncan, Andrew J Daley
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