Direct measurement of the energy spectrum of a quantum dot qubit
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| author | Reily, J. King, Daniel J. Marcks, Jonathan C. Wolfe, M. A. Marciniec, Piotr Joseph, E. S. Kovach, Tyler J. Coe, Brighton X. Friesen, Mark Woods, Benjamin D. Eriksson, M. A. |
| author_facet | Reily, J. King, Daniel J. Marcks, Jonathan C. Wolfe, M. A. Marciniec, Piotr Joseph, E. S. Kovach, Tyler J. Coe, Brighton X. Friesen, Mark Woods, Benjamin D. Eriksson, M. A. |
| contents | The mapping between gate voltages applied to a double quantum dot, and the parameters of a Hubbard-like Hamiltonian, is of utmost importance for understanding and operating spin qubits. State-of-the-art techniques for measuring Hamiltonian parameters (e.g., detuning axis pulsed spectroscopy, DAPS) provide details about energy levels; however, tunnel coupling estimates typically reveal only a small portion of the full Hamiltonian. Here, we demonstrate a Hamiltonian-agnostic technique for measuring the double dot energy spectrum over a wide energy range, at every value of the detuning, called delta-axis spectroscopy (DAXS). We apply the DAXS method to obtain the energy spectrum of a Si/SiGe double quantum dot and use this data to extract the diagonal and off-diagonal couplings of a 15-level Hubbard-like Hamiltonian, demonstrating very good agreement with the experimental measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_29229 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Direct measurement of the energy spectrum of a quantum dot qubit Reily, J. King, Daniel J. Marcks, Jonathan C. Wolfe, M. A. Marciniec, Piotr Joseph, E. S. Kovach, Tyler J. Coe, Brighton X. Friesen, Mark Woods, Benjamin D. Eriksson, M. A. Quantum Physics The mapping between gate voltages applied to a double quantum dot, and the parameters of a Hubbard-like Hamiltonian, is of utmost importance for understanding and operating spin qubits. State-of-the-art techniques for measuring Hamiltonian parameters (e.g., detuning axis pulsed spectroscopy, DAPS) provide details about energy levels; however, tunnel coupling estimates typically reveal only a small portion of the full Hamiltonian. Here, we demonstrate a Hamiltonian-agnostic technique for measuring the double dot energy spectrum over a wide energy range, at every value of the detuning, called delta-axis spectroscopy (DAXS). We apply the DAXS method to obtain the energy spectrum of a Si/SiGe double quantum dot and use this data to extract the diagonal and off-diagonal couplings of a 15-level Hubbard-like Hamiltonian, demonstrating very good agreement with the experimental measurements. |
| title | Direct measurement of the energy spectrum of a quantum dot qubit |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.29229 |