Speaker
Description
Sukhjit P. Singh,1 Elnaz Bazzazi,
2, ∗ Diego N. Bernal-Garc´ıa,1 Simon White,1 Hassan Jamal Latief,3 Alison
Goldingay,3 Sven Rogge,3 Sergei Slussarenko,1 Farzad Ghafari,1 Emanuele Polino,1 and Nora Tischler1
1Queensland Quantum and Advanced Technologies Research Institute,
Centre for Quantum Computation and Communication Technology,
Griffith University, Yuggera Country, Brisbane, Queensland, 4111 Australia
2Department of Physics, Humboldt University of Berlin, Berlin, 12489 Germany
3Centre for Quantum Computation and Communication Technology,
School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia
Entangled states of photons form the foundation of quantum communication, computation, and
metrology. Yet their generation remains fundamentally constrained: in the absence of intrinsic
photon–photon interactions, the generation of such states is inherently probabilistic rather than
deterministic. The prevalent technique of post-selection verifies the creation of an entangled state by
detecting and thus destroying it. Heralding offers a solution in which measuring ancillary photons in
auxiliary modes signals the state generation without the need to measure it. Here, we introduce and
experimentally demonstrate a scheme to generate a three-mode NOON state, where the detection
of a single photon in one heralding mode signifies the presence of the state in three target modes.
We validate the generated state by estimating a fidelity of 0.823 ± 0.018 with respect to an ideal
three-mode NOON state and certifying genuine multipartite entanglement. By virtue of the high
success probability and small resource overhead of our scheme, our work provides a theoretical and
experimental stepping stone for entangled multi-mode state generation, which is realizable with
current technology. These multi-mode entangled states represent a key direction for linear optical
quantum information that is complementary to multi-qubit state encoding. enables.
