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TT: Fachverband Tiefe Temperaturen

TT 37: Quantum Coherence, Quantum Information Systems 1

TT 37.6: Vortrag

Mittwoch, 13. März 2013, 10:45–11:00, H19

High-Fidelity Single-Qubit Gates for Two-Electron Spin Qubits — •Pascal Cerfontaine, Fabian Brings, Tim Botzem, David DiVincenzo, and Hendrik Bluhm — 2nd Institute of Physics C, RWTH Aachen University, 52074 Aachen, Germany

Two-electron spin qubits in double quantum dots are promising candidates for quantum computation. Arbitrary single-qubit gates by electrical manipulation of the exchange interaction between two adjacent electrons while maintaining a magnetic field gradient have been demonstrated. However, simple gate constructions incur systematic gate errors in the presence of realistic experimental constraints.

We show the existence of a set of single-qubit gates obtained from simulations based on a model that reflects the experimentally important imperfections. Without decoherence, they exactly implement the desired gates.

Dephasing effects are minimized by avoiding operating points with large sensitivity to charge noise. Furthermore, we show that the gates can be fine-tuned on the experiment using an iterative optimization protocol based on the bootstrap method demonstrated in [1]. Our results should enable the complete elimination of systematic errors from an experimental realization of the gates.
[1] V. V. Dobrovitski et al., Phys. Rev. Lett. 105, 077601 (2010).