Entanglement-Based dc magnetometry with separated ions
We demonstrate sensing of inhomogeneous dc magnetic fields by employing entangled trapped ions, which are shuttled in a segmented Paul trap. As sensor states, we use Bell states of the type j↑↓i þ eiφj↓↑i encoded in two 40Caþ ions stored at different locations. The linear Zeeman effect leads to the...
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2017
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21603308_v7_n3_p_Ruster http://hdl.handle.net/20.500.12110/paper_21603308_v7_n3_p_Ruster |
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paper:paper_21603308_v7_n3_p_Ruster2023-06-08T16:34:26Z Entanglement-Based dc magnetometry with separated ions Frequency estimation Ground state Ions Magnetic field measurement Magnetic fields Magnetism Magnetometry Spectroscopy Trapped ions Consecutive measurements DC magnetic field Dynamical decoupling High dynamic range Information gain Magnetic field fluctuations Meta-stable state Spatial resolution Quantum entanglement We demonstrate sensing of inhomogeneous dc magnetic fields by employing entangled trapped ions, which are shuttled in a segmented Paul trap. As sensor states, we use Bell states of the type j↑↓i þ eiφj↓↑i encoded in two 40Caþ ions stored at different locations. The linear Zeeman effect leads to the accumulation of a relative phase φ, which serves for measuring the magnetic-field difference between the constituent locations. Common-mode magnetic-field fluctuations are rejected by the entangled sensor state, which gives rise to excellent sensitivity without employing dynamical decoupling and therefore enables accurate dc sensing. Consecutive measurements on sensor states encoded in the S1=2 ground state and in the D5=2 metastable state are used to separate an ac Zeeman shift from the linear dc Zeeman effect. We measure magnetic-field differences over distances of up to 6.2 mm, with accuracies down to 300 fT and sensitivities down to 12 pT/√Hz. Our sensing scheme features spatial resolutions in the 20-nm range. For optimizing the information gain while maintaining a high dynamic range, we implement an algorithm for Bayesian frequency estimation. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21603308_v7_n3_p_Ruster http://hdl.handle.net/20.500.12110/paper_21603308_v7_n3_p_Ruster |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Frequency estimation Ground state Ions Magnetic field measurement Magnetic fields Magnetism Magnetometry Spectroscopy Trapped ions Consecutive measurements DC magnetic field Dynamical decoupling High dynamic range Information gain Magnetic field fluctuations Meta-stable state Spatial resolution Quantum entanglement |
| spellingShingle |
Frequency estimation Ground state Ions Magnetic field measurement Magnetic fields Magnetism Magnetometry Spectroscopy Trapped ions Consecutive measurements DC magnetic field Dynamical decoupling High dynamic range Information gain Magnetic field fluctuations Meta-stable state Spatial resolution Quantum entanglement Entanglement-Based dc magnetometry with separated ions |
| topic_facet |
Frequency estimation Ground state Ions Magnetic field measurement Magnetic fields Magnetism Magnetometry Spectroscopy Trapped ions Consecutive measurements DC magnetic field Dynamical decoupling High dynamic range Information gain Magnetic field fluctuations Meta-stable state Spatial resolution Quantum entanglement |
| description |
We demonstrate sensing of inhomogeneous dc magnetic fields by employing entangled trapped ions, which are shuttled in a segmented Paul trap. As sensor states, we use Bell states of the type j↑↓i þ eiφj↓↑i encoded in two 40Caþ ions stored at different locations. The linear Zeeman effect leads to the accumulation of a relative phase φ, which serves for measuring the magnetic-field difference between the constituent locations. Common-mode magnetic-field fluctuations are rejected by the entangled sensor state, which gives rise to excellent sensitivity without employing dynamical decoupling and therefore enables accurate dc sensing. Consecutive measurements on sensor states encoded in the S1=2 ground state and in the D5=2 metastable state are used to separate an ac Zeeman shift from the linear dc Zeeman effect. We measure magnetic-field differences over distances of up to 6.2 mm, with accuracies down to 300 fT and sensitivities down to 12 pT/√Hz. Our sensing scheme features spatial resolutions in the 20-nm range. For optimizing the information gain while maintaining a high dynamic range, we implement an algorithm for Bayesian frequency estimation. |
| title |
Entanglement-Based dc magnetometry with separated ions |
| title_short |
Entanglement-Based dc magnetometry with separated ions |
| title_full |
Entanglement-Based dc magnetometry with separated ions |
| title_fullStr |
Entanglement-Based dc magnetometry with separated ions |
| title_full_unstemmed |
Entanglement-Based dc magnetometry with separated ions |
| title_sort |
entanglement-based dc magnetometry with separated ions |
| publishDate |
2017 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21603308_v7_n3_p_Ruster http://hdl.handle.net/20.500.12110/paper_21603308_v7_n3_p_Ruster |
| _version_ |
1768546044459614208 |