On-chip microwave source of coherent states with in-situ control of the photon numebr distribution*

Populating superconducting cavities with specifically designed coherent states is a fundamental step in many quantum error correction and quantum comunication protocols [1-2]. In the microwave regime, the possibility to design and engineer superconducting circuits behaving like artificial atoms supports the realization of quantum optics protocols, including microwave photons generation [3]. Here, we propose and theoretically investigate a new design that allows on-chip generation of microwave coherent states with on-demand control on the photon number distribution. The scheme is based on driving a superconducting circuit acting as a photon source and controlling the steady-state photons injected in a target resonator via an external magnetic flux. We will discuss the experimental feasibility of the proposed design and its possible implementation for driving multiple superconducting cavities.

[1] Cai, Weizhou, et al. "Bosonic quantum error correction codes in superconducting quantum circuits." Fundamental Research 1.1 (2021): 50-67.

 

[2] Wang, W., et al. "Converting quasiclassical states into arbitrary fock state superpositions in a superconducting circuit." Physical Review Letters 118.22 (2017): 223604.

 

[3] You, J. Q., et al. "Persistent single-photon production by tunable on-chip micromaser with a superconducting quantum circuit." Physical Review B 75.10 (2007): 104516.