Barak Dayan

Highly entangled multiphoton graph states are a crucial resource in photonic quantum computation and communication. Yet, the lack of photon-photon interactions makes the construction of such graph states especially challenging. Typically, these states are produced through probabilistic single-photon sources and linear-optics entangling operations that require indistinguishable photons.

Single-photon nonlinearity, namely, the change in the response of the system as the result of the interaction with a single photon, is generally considered an inherent property of a single quantum emitter. Although the dependence on the number of emitters is well understood for the case of two-level systems, deterministic operations such as single-photon switching or photon-atom gates inherently require more complex level structures.

Yaron Silberberg of the Weizmann Institute in Israel passed away in April. Here, some of his former students and friends remind us of who Yaron was: a creative researcher and a mentor without ego with major achievements in nonlinear optics, microscopy and quantum physics. References 1. Silberberg, Y. Opt. Lett. 15, 1282–1284 (1990). 2. Eisenberg, H. S., Silberberg, Y., Morandotti, R., Boyd, A. R. & Aitchison, J. S. Phys. Rev. Lett. 81, 3383–3386 (1998). 3. Barad, Y., Eisenberg, H. S., Horowitz, M. & Silberberg, Y.