Authors Sabapathy, Krishna Kumar Citation Key 701 COinS Data Date Published 4/2016 DOI 10.1103/PhysRevA.93.042103 ISSN 2469-9934 Issue 4 Journal Physical Review A Short Title Phys. Rev. A Volume 93 Year of Publication 2016 ← Witnessing entanglement by proxy → Quantum-optical channels that output only classical states