Berlin 2024 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 28: Surface Atom and Color Center Spin Qubits

QI 28.4: Vortrag

Donnerstag, 21. März 2024, 16:00–16:15, HFT-FT 131

Scaling-up of NV Quantum Information Processors — •Jonas Breustedt and Martin Plenio — Institut für Theoretische Physik, Universität Ulm

Finding a working and scaleable quantum computation architecture is an important topic in current quantum information. Here, quantum information processors based on nitrogen-vacancy (NV) centers in diamond constitute one such possible architecture. One particular advantage is their compactness: At distances between NV centers of ∼10nm, even micrometer sized diamond arrays could host on the order of millions of NVs. However, this close proximity is also required for efficient inter-NV coupling and consequently poses a problem when combined with the optical readout schemes for NVs: Selective addressability of individual NVs becomes a challenging affair, due to readout pulses performing the same external perturbation on multiple NVs.

In this work, we study the effect of optical driving of a coupled 2-NV system. We then quantify how differences in local, i.e. NV specific, parameters can be employed to obtain selective addressability of NV centers even though both centers experience the same optical driving. Our goal is to derive parameter regimes for, in particular, NV distances and lattice strain in which NVs can still be accessed individually. Identifying these regimes would be an important step to scale-up NV quantum information processing platforms.

Keywords: NV centers; Solid-state qubits; Selective qubit readout; Quantum processor architecture