Tunable quantum interference in a 3D integrated circuit

Zachary Chaboyer*, Thomas Meany, L. G. Helt, Michael J. Withford, M. J. Steel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)
20 Downloads (Pure)


Integrated photonics promises solutions to questions of stability, complexity, and size in quantum optics. Advances in tunable and non-planar integrated platforms, such as laser-inscribed photonics, continue to bring the realisation of quantum advantages in computation and metrology ever closer, perhaps most easily seen in multi-path interferometry. Here we demonstrate control of two-photon interference in a chip-scale 3D multi-path interferometer, showing a reduced periodicity and enhanced visibility compared to single photon measurements. Observed non-classical visibilities are widely tunable, and explained well by theoretical predictions based on classical measurements. With these predictions we extract Fisher information approaching a theoretical maximum. Our results open a path to quantum enhanced phase measurements.

Original languageEnglish
Article number9601
Pages (from-to)1-5
Number of pages5
JournalScientific Reports
Publication statusPublished - 27 Apr 2015

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