Bin Qian, Wu Ying, Lü Xin-You
School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Phys Rev Lett. 2021 Aug 13;127(7):073602. doi: 10.1103/PhysRevLett.127.073602.
We demonstrate symmetry protected multiphoton bundle emission in the cavity QED system under the ultrastrong coupling regime. Our proposal only enables the super-Rabi oscillations with periodic generation of even correlated photons in the cavity, which is realized by combining the laser driven flip of qubit and the symmetry conserved transitions induced by Rabi interaction with parity symmetry. Combined with dissipation, only 2n-photon bundle emissions are allowed, due to the almost perfect suppression of bundle emissions with odd correlated photons. Meanwhile, the corresponding purities are significantly enhanced by the parity symmetry. This work extends multiphoton bundle emission to the ultrastrong coupling regime, and offers the prospect of exploring symmetry-protected multiphoton physics.
我们展示了在超强耦合 regime 下腔量子电动力学系统中对称性保护的多光子束发射。我们的提议仅能实现具有腔内偶数关联光子周期性产生的超拉比振荡，这是通过将量子比特的激光驱动翻转与由具有宇称对称性的拉比相互作用诱导的对称性守恒跃迁相结合来实现的。结合耗散，由于奇数关联光子的束发射几乎被完全抑制，仅允许 2n 光子束发射。同时，宇称对称性显著提高了相应的纯度。这项工作将多光子束发射扩展到超强耦合 regime，并为探索对称性保护的多光子物理学提供了前景。
