Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity
Abstract Fast and high-fidelity qubit measurement is essential for quantum error correction in universal quantum computing. This study examines dispersive measurement of a spin in a semiconductor double quantum dot using a nonlinear microwave resonator. By employing displaced squeezed vacuum states,...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2024-12-01
|
| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-024-00924-8 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846100956382494720 |
|---|---|
| author | Chon-Fai Kam Xuedong Hu |
| author_facet | Chon-Fai Kam Xuedong Hu |
| author_sort | Chon-Fai Kam |
| collection | DOAJ |
| description | Abstract Fast and high-fidelity qubit measurement is essential for quantum error correction in universal quantum computing. This study examines dispersive measurement of a spin in a semiconductor double quantum dot using a nonlinear microwave resonator. By employing displaced squeezed vacuum states, we achieve rapid, high-fidelity readout for silicon spin qubits. Our results show that modest squeezing and mild nonlinearity significantly enhance the signal-to-noise ratio (SNR) and the fidelity of qubit-state readout. By optimally adjusting the phases of squeezing and nonlinearity, we reduce readout time to sub-microsecond ranges. With current technology parameters (κ ≈ 2χ s , χ s /(2π) ≈ 0.15 MHz), utilizing a displaced squeezed vacuum state with 30 photons and a modest squeezing parameter r ≈ 0.6, along with a nonlinear microwave resonator charactered by a strength of λ ≈ − 1.2χ s , a readout fidelity of 98% can be attained within a readout time of around 0.6 μs. |
| format | Article |
| id | doaj-art-20fa5db1264a401ab2e89b5d1e2f3da0 |
| institution | Kabale University |
| issn | 2056-6387 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj-art-20fa5db1264a401ab2e89b5d1e2f3da02024-12-29T12:39:54ZengNature Portfolionpj Quantum Information2056-63872024-12-0110111110.1038/s41534-024-00924-8Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearityChon-Fai Kam0Xuedong Hu1Department of Informatics, LMU MunichDepartment of Physics, University at Buffalo, SUNYAbstract Fast and high-fidelity qubit measurement is essential for quantum error correction in universal quantum computing. This study examines dispersive measurement of a spin in a semiconductor double quantum dot using a nonlinear microwave resonator. By employing displaced squeezed vacuum states, we achieve rapid, high-fidelity readout for silicon spin qubits. Our results show that modest squeezing and mild nonlinearity significantly enhance the signal-to-noise ratio (SNR) and the fidelity of qubit-state readout. By optimally adjusting the phases of squeezing and nonlinearity, we reduce readout time to sub-microsecond ranges. With current technology parameters (κ ≈ 2χ s , χ s /(2π) ≈ 0.15 MHz), utilizing a displaced squeezed vacuum state with 30 photons and a modest squeezing parameter r ≈ 0.6, along with a nonlinear microwave resonator charactered by a strength of λ ≈ − 1.2χ s , a readout fidelity of 98% can be attained within a readout time of around 0.6 μs.https://doi.org/10.1038/s41534-024-00924-8 |
| spellingShingle | Chon-Fai Kam Xuedong Hu Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity npj Quantum Information |
| title | Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity |
| title_full | Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity |
| title_fullStr | Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity |
| title_full_unstemmed | Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity |
| title_short | Fast and high-fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity |
| title_sort | fast and high fidelity dispersive readout of a spin qubit with squeezed microwave and resonator nonlinearity |
| url | https://doi.org/10.1038/s41534-024-00924-8 |
| work_keys_str_mv | AT chonfaikam fastandhighfidelitydispersivereadoutofaspinqubitwithsqueezedmicrowaveandresonatornonlinearity AT xuedonghu fastandhighfidelitydispersivereadoutofaspinqubitwithsqueezedmicrowaveandresonatornonlinearity |