Parts | Days | Selection | Search | Updates | Downloads | Help

MON: Monday Contributed Sessions

MON 13: QIP Implementations: Photons II

MON 13.4: Talk

Monday, September 8, 2025, 17:15–17:30, ZHG001

Generation a 3-mode NOON state with heralding — •Sukhjit Singh, Emanuele Polino, Farzad Ghafari, Simon White, Geoff Pryde, Sergei Slussarenko, and Nora Tischler — Queensland Quantum and Advanced Technologies Institute and Centre for Quantum Computation and Communication Technology, Griffith University, Yuggera Country, Brisbane, QLD 4111, Australia

The preparation of photonic entangled states is generally probabilistic, and their successful generation is mainly verified by destructively measuring them (post-selection), making them impractical for many large-scale applications. This problem can be avoided by heralding, which means creating the entangled state with additional photon(s) in ancilla modes, and upon only measuring these modes, the desired state’s successful generation can be verified.

Multi-mode NOON states, a coherent superposition of N photons in one mode and none in the other d modes, are optimal probes for multiphase sensing and key resources for phase imaging in optical microscopy. However, it must be generated in a heralded manner. Only then can it be used efficiently to perform phase sensing, without reducing the Fisher information due to failed state generation attempts.

Using single photons, linear optics and SNSPDs, we have experimentally created for the first time a 3-mode NOON state whose successful generation can be verified by detecting one and only one auxiliary photon in an additional mode: (|2,0,0> + |0,2,0> + |0,0,2>)|1>.

Keywords: Multi-mode entangled state; Multiphase Sensing; Heralding; Single photons; Spontaneous parametric down conversion