Xing Fan
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Xing Fan has a total of 43 co-authors. Here are the top co-authors by number of shared publications:
- Gerald Gabrielse
Northwestern University
9 shared publications - Benedict A. D. Sukra
Northwestern University
3 shared publications S. E. Fayer
Center for Fundamental Physics, Northwestern University 2 , Evanston, Illinois 60208, USA
3 shared publications- Shoji Asai
University of Tokyo
3 shared publications T. G. Myers
Center for Fundamental Physics, Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA
3 shared publicationsAkio Sugamoto
Department of Physics, Graduate School of Humanities and Sciences, Ochanomizu University, 2-1-1 Ohtsuka, Bunkyo-ku, Tokyo 112-8610, Japan
2 shared publications
Latest Publications
- 4 November 2026
- Published by American Physical Society (APS) in Physical Review A
- Vol. 114 (5)
Demonstration of a spherical Penning trap for single electrons
- 4 November 2026
- Published by American Physical Society (APS) in Physical Review A
- Vol. 114 (5)
Demonstration of a spherical Penning trap for single electrons
- 20 October 2026
- Published by American Physical Society (APS) in Physical Review Applied
- Vol. 26 (4) , 044055
Single electrons in a dual-plane printed-circuit-board Penning trap
We demonstrate single-electron trapping and detection in a dual-plane printed-circuit-board Penning trap. We have performed deterministic single-electron loading, achieved a axial damping rate of ${\ensuremath{\gamma}}_{z}/(2\ensuremath{\pi})=18(1)\text{ }\mathrm{Hz}$, measured the axial temperature, and measured the magnetron-radius growth rate at magnetic fields below 0.15 T. These results establish a practical platform for dual-plane Penning traps.- 20 October 2026
- Published by American Physical Society (APS) in Physical Review Applied
- Vol. 26 (4) , 044055
Single electrons in a dual-plane printed-circuit-board Penning trap
We demonstrate single-electron trapping and detection in a dual-plane printed-circuit-board Penning trap. We have performed deterministic single-electron loading, achieved a axial damping rate of ${\ensuremath{\gamma}}_{z}/(2\ensuremath{\pi})=18(1)\text{ }\mathrm{Hz}$, measured the axial temperature, and measured the magnetron-radius growth rate at magnetic fields below 0.15 T. These results establish a practical platform for dual-plane Penning traps.- 27 August 2025
- Published by American Physical Society (APS) in Physical Review A
- Vol. 112 (2)
Nuclear-electric-quadrupole-moment-induced parity doubling in molecules for symmetry-violation searches
- 27 August 2025
- Published by American Physical Society (APS) in Physical Review A
- Vol. 112 (2)
Nuclear-electric-quadrupole-moment-induced parity doubling in molecules for symmetry-violation searches
- Open Access
Nuclear Electric Quadrupole Moment-Induced Parity Doubling in Molecules for Symmetry-Violation Searches
Searches for the nuclear magnetic quadrupole moment (MQM) and nuclear Schiff moment (NSM) have high discovery potential for violations of time ($T$) and parity ($P$) reversal symmetries beyond the Standard Model. Molecules containing heavy nuclei are typically used to enhance the sensitivity to MQMs and NSMs due to their strong internal electric fields and potential octupole deformation. To extract these effects in the laboratory frame, a bias electric field is required to polarize the molecule by mixing states of opposite parity (parity doublets). Typical heavy nuclei that are sensitive to symmetry-violation also possess large nuclear electric quadrupole moments (EQMs) when its nuclear spin is $I\geq1$. We show that EQMs can significantly modify the energy splitting between parity doublet states and thus change the required polarizing electric field. As a result, the EQM-induced energy splitting must be taken into account in designing such experiments. We provide qualitative estimates of parity doubling from EQMs and supporting \textit{ab initio} calculations, along with implications for candidate molecules in symmetry-violation searches.Open AccessNuclear Electric Quadrupole Moment-Induced Parity Doubling in Molecules for Symmetry-Violation Searches
Searches for the nuclear magnetic quadrupole moment (MQM) and nuclear Schiff moment (NSM) have high discovery potential for violations of time ($T$) and parity ($P$) reversal symmetries beyond the Standard Model. Molecules containing heavy nuclei are typically used to enhance the sensitivity to MQMs and NSMs due to their strong internal electric fields and potential octupole deformation. To extract these effects in the laboratory frame, a bias electric field is required to polarize the molecule by mixing states of opposite parity (parity doublets). Typical heavy nuclei that are sensitive to symmetry-violation also possess large nuclear electric quadrupole moments (EQMs) when its nuclear spin is $I\geq1$. We show that EQMs can significantly modify the energy splitting between parity doublet states and thus change the required polarizing electric field. As a result, the EQM-induced energy splitting must be taken into account in designing such experiments. We provide qualitative estimates of parity doubling from EQMs and supporting \textit{ab initio} calculations, along with implications for candidate molecules in symmetry-violation searches. - 7 April 2025
- Published by American Physical Society (APS) in Physical Review A
- Vol. 111 (4) , 042806
Quantum-logic spectroscopy of an electron or positron for precise tests of the standard model
We propose a scheme for quantum-logic spectroscopy of an electron or positron in a Penning trap. An electron or positron in a spectroscopy trap is coupled to a remote logic electron or positron via a wire to achieve motional entanglement. By separating the two traps, one can significantly improve magnetic field homogeneity, microwave characteristics, and detection sensitivity. The proposed scheme will improve the measurement precision of the electron's and positron's magnetic moments and charge-to-mass ratios, enabling precise tests of the standard model of particle physics.
- 7 April 2025
- Published by American Physical Society (APS) in Physical Review A
- Vol. 111 (4) , 042806
Quantum-logic spectroscopy of an electron or positron for precise tests of the standard model
We propose a scheme for quantum-logic spectroscopy of an electron or positron in a Penning trap. An electron or positron in a spectroscopy trap is coupled to a remote logic electron or positron via a wire to achieve motional entanglement. By separating the two traps, one can significantly improve magnetic field homogeneity, microwave characteristics, and detection sensitivity. The proposed scheme will improve the measurement precision of the electron's and positron's magnetic moments and charge-to-mass ratios, enabling precise tests of the standard model of particle physics.
- Top Cited Papers
- 13 February 2023
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 130 (7) , 071801
Measurement of the Electron Magnetic Moment
The electron magnetic moment, [0.13 ppt], is determined 2.2 times more accurately than the value that stood for fourteen years. The most precisely determined property of an elementary particle tests the most precise prediction of the standard model (SM) to 1 part in . The test would improve an order of magnitude if the uncertainty from discrepant measurements of the fine structure constant is eliminated since the SM prediction is a function of . The new measurement and SM theory together predict [0.11 ppb] with an uncertainty 10 times smaller than the current disagreement between measured values.- 13 February 2023
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 130 (7) , 071801
Top Cited PapersMeasurement of the Electron Magnetic Moment
The electron magnetic moment, [0.13 ppt], is determined 2.2 times more accurately than the value that stood for fourteen years. The most precisely determined property of an elementary particle tests the most precise prediction of the standard model (SM) to 1 part in . The test would improve an order of magnitude if the uncertainty from discrepant measurements of the fine structure constant is eliminated since the SM prediction is a function of . The new measurement and SM theory together predict [0.11 ppb] with an uncertainty 10 times smaller than the current disagreement between measured values. - Open Access
One-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector
We propose using trapped electrons as high-$Q$ resonators for detecting meV dark photon dark matter. When the rest energy of the dark photon matches the energy splitting of the two lowest cyclotron levels, the first excited state of the electron cyclotron will be resonantly excited. A proof-of-principle measurement, carried out with one electron, demonstrates that the method is background-free over a 7.4 day search. It sets a limit on dark photon dark matter at 148 GHz (0.6 meV) that is around 75 times better than previous constraints. Dark photon dark matter in the 0.1-1 meV mass range (20-200 GHz) could likely be detected at a similar sensitivity in an apparatus designed for dark photon detection.
Open AccessOne-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector
We propose using trapped electrons as high-$Q$ resonators for detecting meV dark photon dark matter. When the rest energy of the dark photon matches the energy splitting of the two lowest cyclotron levels, the first excited state of the electron cyclotron will be resonantly excited. A proof-of-principle measurement, carried out with one electron, demonstrates that the method is background-free over a 7.4 day search. It sets a limit on dark photon dark matter at 148 GHz (0.6 meV) that is around 75 times better than previous constraints. Dark photon dark matter in the 0.1-1 meV mass range (20-200 GHz) could likely be detected at a similar sensitivity in an apparatus designed for dark photon detection.
- Open Access
- 23 December 2022
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 129 (26) , 261801
One-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector
We propose using trapped electrons as high- resonators for detecting meV dark photon dark matter. When the rest energy of the dark photon matches the energy splitting of the two lowest cyclotron levels, the first excited state of the electron cyclotron will be resonantly excited. A proof-of-principle measurement, carried out with one electron, demonstrates that the method is background free over a 7.4 day search. It sets a limit on dark photon dark matter at 148 GHz (0.6 meV) that is around 75 times better than previous constraints. Dark photon dark matter in the 0.1–1 meV mass range (20–200 GHz) could likely be detected at a similar sensitivity in an apparatus designed for dark photon detection.- 23 December 2022
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 129 (26) , 261801
Open AccessOne-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector
We propose using trapped electrons as high- resonators for detecting meV dark photon dark matter. When the rest energy of the dark photon matches the energy splitting of the two lowest cyclotron levels, the first excited state of the electron cyclotron will be resonantly excited. A proof-of-principle measurement, carried out with one electron, demonstrates that the method is background free over a 7.4 day search. It sets a limit on dark photon dark matter at 148 GHz (0.6 meV) that is around 75 times better than previous constraints. Dark photon dark matter in the 0.1–1 meV mass range (20–200 GHz) could likely be detected at a similar sensitivity in an apparatus designed for dark photon detection. - 25 May 2022
- Published by Morressier GmbH
Status of the new measurement of electron magnetic moment
Status of the new measurement of electron magnetic moment |
- 25 May 2022
- Published by Morressier GmbH
Status of the new measurement of electron magnetic moment
Status of the new measurement of electron magnetic moment |
- 6 July 2021
- Published by American Physical Society (APS) in Physical Review Applied
- Vol. 16 (1) , 014009
Theoretical Analysis and Experimental Demonstration of a Chirped Pulse-Train Generator and its Potential for Efficient Cooling of Positronium
We propose an injection-locked pulsed laser with an electro-optic phase modulator in a Ti:sapphire laser cavity to realize both broadband optical spectra and long pulse durations. Further, we experimentally and theoretically demonstrate that the output microsecond-long pulse consists of a train of short pulses in the time domain and a comblike broadband spectrum with fast chirping in the positive and negative directions in the frequency domain. Finally, we discuss the potential of the proposed system for efficient Doppler cooling of positronium, a short-lived exotic atom.
- 6 July 2021
- Published by American Physical Society (APS) in Physical Review Applied
- Vol. 16 (1) , 014009
Theoretical Analysis and Experimental Demonstration of a Chirped Pulse-Train Generator and its Potential for Efficient Cooling of Positronium
We propose an injection-locked pulsed laser with an electro-optic phase modulator in a Ti:sapphire laser cavity to realize both broadband optical spectra and long pulse durations. Further, we experimentally and theoretically demonstrate that the output microsecond-long pulse consists of a train of short pulses in the time domain and a comblike broadband spectrum with fast chirping in the positive and negative directions in the frequency domain. Finally, we discuss the potential of the proposed system for efficient Doppler cooling of positronium, a short-lived exotic atom.