Real-time two-axis control of a spin qubit
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866911783341522944 |
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| author | Berritta, Fabrizio Rasmussen, Torbjørn Krzywda, Jan A. van der Heijden, Joost Fedele, Federico Fallahi, Saeed Gardner, Geoffrey C. Manfra, Michael J. van Nieuwenburg, Evert Danon, Jeroen Chatterjee, Anasua Kuemmeth, Ferdinand |
| author_facet | Berritta, Fabrizio Rasmussen, Torbjørn Krzywda, Jan A. van der Heijden, Joost Fedele, Federico Fallahi, Saeed Gardner, Geoffrey C. Manfra, Michael J. van Nieuwenburg, Evert Danon, Jeroen Chatterjee, Anasua Kuemmeth, Ferdinand |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_02012 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Real-time two-axis control of a spin qubit Berritta, Fabrizio Rasmussen, Torbjørn Krzywda, Jan A. van der Heijden, Joost Fedele, Federico Fallahi, Saeed Gardner, Geoffrey C. Manfra, Michael J. van Nieuwenburg, Evert Danon, Jeroen Chatterjee, Anasua Kuemmeth, Ferdinand Mesoscale and Nanoscale Physics Quantum Physics 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. |
| title | Real-time two-axis control of a spin qubit |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2308.02012 |