Agradecimentos: SMB was supported by the Royal Society, grant no. RP150122. BMG acknowledges support from the UK EPSRC, grant EP/M013294/1. VK is supported by the UK EPSRC Grant EP/L022303/1. EP acknowledges the support of "Research Projects for Excellence IKY/Siemens" (Contract No. 23343). H. M.-C. thanks the Alexander von Humboldt Foundation for support. BCS appreciates support from Alberta Innovates Technology Futures, NSERC and China's 1000 Talent Plan Ver menos

Abstract: Sir Peter Knight is a pioneer in quantum optics which has now grown to an important branch of modem physics to study the foundations and applications of quantum physics. He is leading an effort to develop new technologies from quantum mechanics. In this collection of essays, we recall the time we were working with him as a postdoc or a PhD student and look at how the time with him has influenced our research Ver menos