arXiv subjects

Vincent Reiher

Publications and source records attributed to Vincent Reiher.

2 recordsLinked to original sources

arXiv2022

State Initialization of a Hot Spin Qubit in a Double Quantum Dot by Measurement-Based Quantum Feedback Control

A measurement-based quantum feedback protocol is developed for spin state initialization in a gate-defined double quantum dot spin qubit coupled to a superconducting resonator. The protocol improves qubit state initialization as it is able to robustly prepare the spin in shorter time and reach a higher fidelity, which can be pre-set. Being able to pre-set the fidelity aimed at is a highly desired feature enabling qubit initialization to be more deterministic. The protocol developed herein is also effective at high temperatures, which is critical for the current efforts towards scaling up the number of qubits in quantum computers.

cond-mat.mes-hall↗

arXiv2022

Optimal Control of the Operating Regime of a Single Electron Double Quantum Dot

The double quantum dot device benefits from the advantages of both the spin and charge qubits, while offering ways to mitigate their drawbacks. Careful gate voltage modulation can grant greater spinlike or chargelike dynamics to the device, yielding long coherence times with the former and high electrical susceptibility with the latter for electrically driven spin rotations or coherent interactions with microwave photons. We show that optimal control pulses generated using the GRadient Ascent Pulse Engineering (GRAPE) algorithm can yield higher-fidelity operating regime transfers than can be achieved using linear methods.

cond-mat.mes-hall↗