Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.206802
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Funding
- Swiss National Science Foundation (SNF) through the National Center of Competence in Research (NCCR) Quantum Science and Technology (QSIT), the project Elements for Quantum Information Processing with Semiconductor/Superconductor Hybrids (EQUIPS)
- ETH Zurich
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Developing fast and accurate control and readout techniques is an important challenge in quantum information processing with semiconductor qubits. Here, we study the dynamics and the coherence properties of a GaAs/AlGaAs double quantum dot charge qubit strongly coupled to a frequency-tunable high-impedance resonator. We drive qubit transitions with synthesized microwave pulses and perform qubit readout through the state-dependent frequency shift imparted by the qubit on the dispersively coupled resonator. We perform Rabi oscillation, Ramsey fringe, energy relaxation, and Hahn-echo measurements and find significantly reduced decoherence rates down to gamma(2)/2 pi similar to 3 MHz corresponding to coherence times of up to T-2 similar to 50 ns for charge states in gate-defined quantum dot qubits. We realize Rabi pi pulses of width down to sigma similar to 0.25 ns.
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