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91探花
Atomic and Laser Physics
Credit: Jack Hobhouse

Mr Stefano Veroni

Graduate Student

Research theme

  • Quantum information and computation

Sub department

  • Atomic and Laser Physics

Research groups

  • Theory of quantum systems
stefano.veroni@physics.ox.ac.uk
Clarendon Laboratory
  • About
  • Publications

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鈥攖ermed the 鈥渄isposable Toffoli gadget鈥濃攖hat 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.

Fast entangling gates for Rydberg atoms via resonant dipole-dipole interaction

PRX Quantum American Physical Society (APS) (2025)

Optimized measurement-free and fault-tolerant quantum error correction for neutral atoms

Physical Review Research American Physical Society 6:4 (2024) 43253

Authors:

Stefano Veroni, Markus M眉ller, Giacomo Giudice

Abstract:

A major challenge in performing quantum error correction (QEC) is implementing reliable measurements and conditional feed-forward operations. In quantum computing platforms 91探花ing unconditional qubit resets, or a constant supply of fresh qubits, alternative schemes which do not require measurements are possible. In such schemes, the error correction is realized via crafted coherent quantum feedback. We propose implementations of small measurement-free QEC schemes, which are fault tolerant to circuit-level noise. These implementations are guided by several heuristics to achieve fault tolerance: redundant syndrome information is extracted, and additional single-shot flag qubits are used. By carefully designing the circuit, the additional overhead of these measurement-free schemes is moderate compared to their conventional measurement and feed-forward counterparts. We highlight how this alternative approach paves the way towards implementing resource-efficient measurement-free QEC on neutral-atom arrays.

Boltzmannian state counting for black hole entropy in causal set theory

Physical Review D American Physical Society (APS) 110:2 (2024) 026015

Authors:

Vid Hom拧ak, Stefano Veroni

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