Real-time two-axis control of a spin qubit
- URL: http://arxiv.org/abs/2308.02012v2
- Date: Mon, 26 Feb 2024 17:39:08 GMT
- Title: Real-time two-axis control of a spin qubit
- Authors: Fabrizio Berritta, Torbj{\o}rn Rasmussen, Jan A. Krzywda, Joost van
der Heijden, Federico Fedele, Saeed Fallahi, Geoffrey C. Gardner, Michael J.
Manfra, Evert van Nieuwenburg, Jeroen Danon, Anasua Chatterjee and Ferdinand
Kuemmeth
- Abstract summary: We demonstrate a real-time control protocol for a two-electron singlet-triplet qubit with two fluctuating Hamiltonian parameters.
Powered by a field-programmable gate array (FPGA), the quantum control electronics estimates the Overhauser field gradient between the two electrons in real time.
- Score: 23.355961895855337
- License: http://creativecommons.org/licenses/by-sa/4.0/
- Abstract: Optimal control of qubits requires the ability to adapt continuously to their
ever-changing environment. We demonstrate a real-time control protocol for a
two-electron singlet-triplet qubit with two fluctuating Hamiltonian parameters.
Our approach leverages single-shot readout classification and dynamic waveform
generation, allowing full Hamiltonian estimation to dynamically stabilize and
optimize the qubit performance. Powered by a field-programmable gate array
(FPGA), the quantum control electronics estimates the Overhauser field gradient
between the two electrons in real time, enabling controlled Overhauser-driven
spin rotations and thus bypassing the need for micromagnets or nuclear
polarization protocols. It also estimates the exchange interaction between the
two electrons and adjusts their detuning, resulting in extended coherence of
Hadamard rotations when correcting for fluctuations of both qubit axes. Our
study emphasizes the critical role of feedback in enhancing the performance and
stability of quantum devices affected by quasistatic noise. Feedback will play
an essential role in improving performance in various qubit implementations
that go beyond spin qubits, helping realize the full potential of quantum
devices for quantum technology applications.
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