arXiv subjects

Binh Xuan Cao

Publications and source records attributed to Binh Xuan Cao.

3 recordsLinked to original sources

arXiv2022

Duality-symmetric axion electrodynamics and haloscopes of various geometries

Within the dual symmetric point of view, the theory for seeking axion dark matter via haloscope experiments is derived by exactly solving the dual symmetric axion electrodynamics equation. Notwithstanding that the conventional theory of axion electrodynamics presented in [Phys. Rev. Lett. 51, 1415 (1983) and J. Phys. A: Math. Gen. 19, L33 (1986)] is more commonly used in haloscope theory, we show that the dual symmetric axion electrodynamics has more advantages to apply to haloscope theory. First, the dual symmetric and conventional perspectives of axion electrodynamics coincide under long-wavelength approximation. Moreover, dual symmetric theory can obtain an exact analytical expression of the axion-induced electromagnetic field for any state of axion. This solution has been used in conventional theory for long-wavelength approximation. The difference between two theories can occur in directional axion detection or electric sensing haloscopes. For illustrative purposes, we consider the various type of resonant cavities: cylindrical solenoid, spherical solenoid, two-parallel-sheet cavity, toroidal solenoid with a rectangular cross-section, and with a circular cross-section. The resonance of the axion-induced signal, as well as the ratio of the energy difference over the stored energy inside the cavity, are investigated in these types of cavity.

hep-ph↗

arXiv2020

Design of quantum correlation based automatic focus detection system during dental laser operation

Dental laser has been developed recently and gradually replaced the conventional dental treatment methods, especially in dental caries removal. The utility of laser in dentistry contributes to reduce the pain during surgery and decrease the risk of sequelae after surgery. Although bringing about several beneficial properties such as excellent directionality, high speed, ultra-tiny active area and tunable energy concentration, laser is still quite limited in dental surgery because of the difficulty in real-time high precision detection of laser focus during the operation. In this study, a cutting-edge optical system for real-time focus detection during dental laser operation employing the quantum entanglement of photon pairs created via spontaneous parametric downconversion (SPDC) is presented. Defocusing distance of the specimen which is used as the sample tooth can be determined precisely through spatial correlation of photons arriving at the detectors. The proposed technique can be applied to design automatic focus detection system for use in dental laser operation.

physics.med-ph↗

arXiv2020

Signal detection using biphotons and potential application in axion-like particle search

This paper presents a new optical system for detecting light signals associated with the change in incoming photon number. The system employs quantum correlation of photon pairs created via spontaneous parametric down-conversion (SPDC). The signal, if present, will perturb the flux of the incident photon stream. The perturbed photon stream is first projected through a birefringent crystal where SPDC occurs, converting a single high-energy photon into a pair of low energy photons. The photons in each pair eventually arrive at separate detectors. By examining the biphoton correlation using the probability distribution of the photons at the detectors, which varies depending on the displacement of the main pump photon stream and the change in the number of photons, the small optical displacement of the photon stream and its variance can be determined. The change in incident photon number, in other words, the presence of light signal does not influence the average of the measured optical displacement values. Nevertheless, the change in optical displacement measurement variance when the number of incident photons has changed detects the light signal. This optical setup enables the detection of light signals with low noise and remarkably high precision and sensitivity using quantum correlation. The proposed technique has potential application for axion-like particle search in experimental high energy physics.

hep-ex↗