ELFT HÍRADÓ

[Kormos Márton <kormos.marton AT ttk.bme.hu>]

MEGHÍVÓ

BME Elméleti Fizika Szeminárium,

márc. 20. péntek 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba

Svastits Domonkos (BME Elm. Fiz. Tanszék)
Readout Sweet Spots for Spin Qubits with Strong Spin-Orbit Interaction

Qubit readout schemes often deviate from ideal projective measurements, 
introducing critical issues that limit quantum computing performance. In this 
Letter, we model charge-sensing-based readout for semiconductor spin qubits 
in double quantum dots, and identify key error mechanisms caused by the 
backaction of the charge sensor. We quantify how the charge noise of the 
sensor, residual tunneling, and 𝑔-tensor modulation degrade readout fidelity, 
induce a mixed postmeasurement state, and cause leakage from the 
computational subspace. For state-of-the-art systems with strong spin-orbit 
interaction and electrically tunable 𝑔 tensors, we identify a readout sweet 
spot, that is, a special device configuration where readout is closest to 
projective. Our framework provides a foundation for developing effective 
readout error mitigation strategies, with broad applications for optimizing 
readout performance for a variety of charge-sensing techniques, advancing 
quantum protocols, and improving adaptive circuits for error correction.

Minden érdeklődőt szeretettel várunk.

A további program megtekinthető itt: https://dtp.physics.bme.hu/TheorySeminars

Kormos Márton,
szemináriumi koordinátor