MATTER WAVE LABORATORY @ NCKU
國立成功大學 物理系 冷原子物質波實驗室
ABOUT OUR GROUP
Here in Matter Wave Laboratory at NCKU, we manipulate matter waves to study fields related to quantum sensor, quantum optics and quantum information.
The basic idea is to make matter waves into superposition of different paths. Matter waves, in our case atoms, accumulate different phases according to their paths. The phase difference can be read out through measuring population distribution between different paths. By analyse the measured phase, we can refer back the related physical quantities.
This instrument have demonstrated high precision measurement down to one part per billion level accuracy, and have many potential applications in geodesy, geology, or inertial navigation. We can also modify the set up to study the decoherence feature in quantum mechanics, or explore possible usages in quantum algorithm.
We are looking for inspiring students to join our group. Please contact us if you are interested!
誠徵碩士班學生。意者請洽管培辰助理教授。
OUR FOCUS
what we want to do
SUPERRADIANT RAMAN TRANSITION
By introducing superradiant Raman transition, we can make correlated photons and matter waves. The entanglement between photons and matter waves can not only perform tests of complementary principle, but also surpass the standard quantum limit in measurements.
FOUR-PHOTON RAMAN TRANSITION
Four-photon Raman transition happened when the quantization axis is shifting from being parallel to perpendicular to the Raman beams' direction. It keeps the magnetic-field-insensitive feature like the two-photon Raman transition but can be used straightforwardly in multidimensional applications, like inertial sensors or even higher-dimensional quantum walk systems.
QUANTUM WALK
Quantum walk is an important topic in quantum information. By utilizing the quantum nature in operations similar to the classical random walk, quantum walk can make more efficient quantum algorithms, with many potential applications.
SELECTED PUBLICATIONS
what did we do
HIGH RESOLUTION ATOM INTERFEROMETERS WITH SUPPRESSED DIFFRACTION PHASES
Phys. Rev. Lett. 115, 083002 (2015)
We experimentally and theoretically study the diffraction phase of large-momentum transfer beam splitters in atom interferometers based on Bragg diffraction. We null the diffraction phase and increase the sensitivity of the interferometer by combining Bragg diffraction with Bloch oscillations. We demonstrate agreement between experiment and theory, and a 1500-fold reduction of the diffraction phase, limited by measurement noise.
LARGE FIZEAU’S LIGHT-DRAGGING EFFECT IN A MOVING ELECTROMAGNETICALLY INDUCED TRANSPARENT MEDIUM
Nature Communications 7, 13030 (2016)
We demonstrate a light-dragging experiment in an electromagnetically induced transparent cold atomic ensemble and enhance the dragging effect by at least three orders of magnitude compared with the previous experiments. We therefore realize an atom-based velocimeter, which could pave the way for motional sensing using the collective state of atoms in a room temperature vapour cell or solid state material.
MULTIPHOTON HYPERFINE RAMAN TRANSITIONS WITH DIFFERENT QUANTIZATION AXES
Phys. Rev. A 108, 013308 (2023)
We studied both theoretically and experimentally the hyperfine Raman transition with different quantization axes and found a four-photon Raman transition. It keeps the magnetic-field-insensitive feature like the two-photon Raman transition but can be applied in multidimensional applications and has the potential in magnetometers.
MULTIDIMENSIONAL MATTER-WAVE BEAM SPLITTERS BY MULTIPHOTON HYPERFINE RAMAN TRANSITIONS
Phys. Rev. A 109, 013327 (2024)
We present different configurations of multidimensional beamsplitters using both conventional two-photon Raman transitions and recently discovered four-photon Raman transitions. We explored and estimated statistical and systematic errors that may occur when multiple Raman transitions are used to construct multidimensional atom interferometers with deviated quantization axes.