Subtraction and Addition of Propagating Photons by TwoLevel Emitters
Abstract
Coherent manipulation of quantum states of light is key to photonic quantum information processing. In this Letter, we show that a passive twolevel nonlinearity suffices to implement nonGaussian quantum operations on propagating field modes. In particular, the collective lightmatter interaction can efficiently extract a single photon from a multiphoton input wave packet to an orthogonal temporal mode. We accurately describe the singlephoton subtraction process by elements of an intuitive quantumtrajectory model. By employing this process, quantum information protocols gain orders of magnitude improved efficiency over heralded schemes with linear optics. The reverse process can be used to add photons onebyone to a single wavepacket mode and compose arbitrarily large Fock states with a finite total success probability $>96.7\%$.
 Publication:

arXiv eprints
 Pub Date:
 April 2024
 DOI:
 10.48550/arXiv.2404.12328
 arXiv:
 arXiv:2404.12328
 Bibcode:
 2024arXiv240412328L
 Keywords:

 Quantum Physics;
 Physics  Optics
 EPrint:
 6+6 pages, 5+3 figures