Controlled-Phase Gate Using Dynamically Coupled Cavities and Optical Nonlinearities
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PhysRevLett.124.160501.pdf
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Published version
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639.91 KB
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Author(s)
Heuck, Mikkel
Englund, Dirk R.
Date Issued
April 2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Heuc, Mikkel et al. “Controlled-Phase Gate Using Dynamically Coupled Cavities and Optical Nonlinearities.” Physical Review Letters, 124, 16 (April 2020): 160501 © 2020 The Author(s)
Version
Final published version
Abstract
We show that relatively simple integrated photonic circuits have the potential to realize a high fidelity deterministic controlled-phase gate between photonic qubits using bulk optical nonlinearities. The gate is enabled by converting travelling continuous-mode photons into stationary cavity modes using strong classical control fields that dynamically change the effective cavity-waveguide coupling rate. This architecture succeeds because it reduces the wave packet distortions that otherwise accompany the action of optical nonlinearities [J. Shapiro, Phys. Rev. A 73, 062305 (2006)PLRAAN1050-294710.1103/PhysRevA.73.062305; J. Gea-Banacloche, Phys. Rev. A 81, 043823 (2010)PLRAAN1050-294710.1103/PhysRevA.81.043823]. We show that high-fidelity gates can be achieved with self-phase modulation in χ(3) materials as well as second-harmonic generation in χ(2) materials. The gate fidelity asymptotically approaches unity with increasing storage time for an incident photon wave packet with fixed duration. We also show that dynamically coupled cavities enable a trade-off between errors due to loss and wave packet distortion. Our proposed architecture represents a new approach to practical implementation of quantum gates that is roomerature compatible and only relies on components that have been individually demonstrated.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.124.160501
