Jeremy O'Brien (born 1975, Australia[1]) is a physicist who researches in quantum optics, optical quantum metrology and quantum information science.

[2] He co-founded and is CEO of the quantum computing firm PsiQuantum.

[3][4] Formerly, he was Professorial Research Fellow in Physics and Electrical Engineering at the University of Bristol, and director of its Centre for Quantum Photonics.

[5][3] His work in optical quantum computing has included the demonstration of the first optical quantum controlled NOT gate.

[6]