Generation of Large-Amplitude Coherent-State Superposition via Ancilla-Assisted Photon Subtraction
Abstract
We propose and demonstrate a novel method to generate a large-amplitude coherent-state superposition (CSS) via ancilla-assisted photon subtraction. The ancillary mode induces quantum interference of indistinguishable processes in an extended space, widening the controllability of quantum superposition at the conditional output. We demonstrate this by a simple time-separated two-photon subtraction from continuous wave squeezed light. We observe the largest CSS of traveling light ever reported without correcting any imperfections, which will enable various quantum information applications with CSS states.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2008
- DOI:
- 10.1103/PhysRevLett.101.233605
- arXiv:
- arXiv:0806.2965
- Bibcode:
- 2008PhRvL.101w3605T
- Keywords:
-
- 42.50.Dv;
- 03.65.Wj;
- 03.67.-a;
- 42.50.Ex;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- State reconstruction quantum tomography;
- Quantum information;
- Optical implementations of quantum information processing and transfer;
- Quantum Physics
- E-Print:
- 5 pages, 4 figures