Optical Coherent Quantum Control
Optical Coherent Quantum Control
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Optical control over nuclear spins.
Nuclear spins are promising quantum information carriers, thanks to their unparalleled coherence times. Meanwhile, optical photons can travel long distances and are suitable for quantum communications. If an efficient nuclear spin-photon coupling can be established, then many crucial applications, such as distributed quantum computing, can be realized. However, this turns out to be a grand challenge, because nuclear spins only interact very weakly with external fields, and the frequencies of optical photons and nuclear spins differ by many orders of magnitude, leading to strong off-resonance.
The opto-nuclear quadrupolar effect. In this regard, I proposed an opto-nuclear quadrupolar (ONQ) effect. The ONQ effect is a second-order NLO process, whereby electron orbital motions mediate efficient nuclear spin-photon interactions. Major advantages of the ONQ effect include: It does not require ancillary electron spins; It allows for arbitrary frequencies of optical photons; And it can be much stronger than other possible NLO effects that involve nuclear spins.
Applications of the ONQ effect. Taking these advantages, we suggested several promising applications of the ONQ effect, ranging from materials spectroscopy to quantum memory and quantum transduction, as well as the laser cooling of nuclear spin excitations. Furthermore, we generalized the ONQ effect to nuclear orbital transitions and demonstrated that it can be utilized to trigger the transitions of 229Th from its ground state to isomeric state, which may enable nuclear lasing.
Related publications:
Haowei Xu, Changhao Li, Guoqing Wang, Hua Wang, Hao Tang, Ariel Rebekah Barr, Paola Cappellaro, and Ju Li, Two-photon Interface of Nuclear Spins Based on the Opto-nucleonic Quadrupolar Effect. Physical Review X 13, 011017 (2023)
Haowei Xu, Guoqing Wang, Changhao Li, Hua Wang, Hao Tang, Ariel Rebekah Barr, Paola Cappellaro, and Ju Li, Laser Cooling of Nuclear Magnons. Physical Review Letters 130, 063602 (2023)
Haowei Xu, Hao Tang, Guoqing Wang, Changhao Li, Boning Li, Paola Cappellaro, and Ju Li, Solid-state 229Th nuclear laser with two-photon pumping. Physical Review A (Letter) 108, L021502 (2023)
Efficient quantum transduction in magnetic topological materials.Â
The strong NLO responses in topological materials may find wide applications, particularly the quantum transduction between photons of vastly different wavelengths, which is crucial for many quantum technologies. I postulated that anti-ferromagnetic magnetic topological materials, such as MnBi2Te4, can serve as efficient quantum transducers, thanks to their topologically enhanced optical response, substantial spin density, and robust spin-orbit coupling. Using MnBi2Te4 as the transducer, unit transduction fidelity, and GHz transduction bandwidth can be achieved with modest experimental requirements.
Related publications:
Haowei Xu, Changhao Li, Guoqing Wang, Hao Tang, Paola Cappellaro, and Ju Li, Efficient quantum transduction using antiferromagnetic topological insulators, Phys. Rev. B 110, 085136 (2024)
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