Seeding Gaussian boson samplers with single photons for enhanced state generation

• URL: http://arxiv.org/abs/2311.03432v2
• Date: Mon, 4 Mar 2024 21:58:53 GMT
• Title: Seeding Gaussian boson samplers with single photons for enhanced state generation
• Authors: Valerio Crescimanna, Aaron Z. Goldberg, Khabat Heshami
• Abstract summary: Non-Gaussian quantum states are crucial to fault-tolerant quantum computation with continuous-variable systems. We consider the addition of a non-Gaussian resource state, particularly single photons, to this configuration and show how it improves the qualities and generation probabilities of desired states.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-Gaussian quantum states are crucial to fault-tolerant quantum computation with continuous-variable systems. Usually, generation of such states involves trade-offs between success probability and quality of the resultant state. For example, injecting squeezed light into a multimode interferometer and postselecting on certain patterns of photon-number outputs in all but one mode, a fundamentally probabilistic task, can herald the creation of cat states, Gottesman-Kitaev-Preskill (GKP) states, and more. We consider the addition of a non-Gaussian resource state, particularly single photons, to this configuration and show how it improves the qualities and generation probabilities of desired states. With only two modes, adding a single photon source improves GKP-state fidelity from 0.68 to 0.95 and adding a second then increases the success probability eightfold; for cat states with a fixed target fidelity, the probability of success can be improved by factors of up to 4 by adding single-photon sources. These demonstrate the usefulness of additional commonplace non-Gaussian resources for generating desirable states of light.

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