Limitations of two-level emitters as nonlinearities in two-photon controlled-phase gates

2016/12/31 by Anders Nysteen, Dara P. S. McCutcheon, Mikkel Heuck +3 · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Mechanical and Optical Resonators #Phase (matter) #Photon #Photonic and Optical Devices #Physics #Quantum Information and Cryptography #Quantum mechanics #Statistical physics #quant-ph

paper · pdf · doi:10.1103/physreva.95.062304

7 pages, 6 figures

openalex created_date 2017/03/16 · arxiv created 2017/04/04 · openalex publication_date 2017/06/05 · arxiv updated 2017/06/20 · openalex updated_date 2026/08/05

Abstract

We investigate the origin of imperfections in the fidelity of a two-photon controlled-phase gate based on two-level-emitter nonlinearities. We focus on a passive system that operates without external modulations to enhance its performance. We demonstrate that the fidelity of the gate is limited by opposing requirements on the input pulse width for one- and two-photon-scattering events. For one-photon scattering, the spectral pulse width must be narrow compared with the emitter linewidth, while two-photon-scattering processes require the pulse width and emitter linewidth to be comparable. We find that these opposing requirements limit the maximum fidelity of the two-photon controlled-phase gate to 84% for photons with Gaussian spectral profiles.

Citations

• Strongly correlated multiparticle transport in one dimension through a quantum impurity
• All-optical routing of single photons by a one-atom switch controlled by a single photon
• Giant optical nonlinearity induced by a single two-level system interacting with a cavity in the Purcell regime
• A quantum logic gate between a solid-state quantum bit and a photon
• On-Demand Single Photons with High Extraction Efficiency and Near-Unity Indistinguishability from a Resonantly Driven Quantum Dot in a Micropillar

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