Coherent photons and macroscopic cat states generated by a cyclic artificial atom with broken symmetry
Abstract
We propose a novel method to generate nonclassical states of a singlemode microwave field, and to produce macroscopic cat states by virtue of a threelevel system with $\Delta$shaped (or cyclic) transitions. This exotic system can be implemented by a superconducting quantum circuit with a broken symmetry in its effective potential. Using the cyclic population transfer, controllable singlemode photon states can be created in the third transition when two classical fields are applied to induce the other two transitions. This is because, for large detuning, two classical fields are equivalent to an effective external force, which derives the quantized single mode. Our approach is valid not only for superconducting quantum circuits but also for any threelevel quantum system with $\Delta$shaped transitions
 Publication:

arXiv eprints
 Pub Date:
 June 2005
 DOI:
 10.48550/arXiv.quantph/0506011
 arXiv:
 arXiv:quantph/0506011
 Bibcode:
 2005quant.ph..6011S
 Keywords:

 Quantum Physics
 EPrint:
 8 pages, 5 figures