# Photonic Quantum Operations via the Quantum Carburettor Effect

## TL;DR

This paper introduces the quantum carburettor effect, demonstrating how a large coherent state can induce a single photon through a beamsplitter, enabling high-fidelity quantum operations on light.

## Contribution

It presents the first experimental test of the quantum carburettor effect and a method to implement the bare raising operator on coherent states using conditional measurement.

## Key findings

- Single photon induction probability approaches 1/e for large coherent states
- High success probability and fidelity in implementing the bare raising operator
- Experimental feasibility of the quantum carburettor effect demonstrated

## Abstract

The bosonic nature of light leads to counter-intuitive bunching effects. We describe an experimentally testable effect in which a single photon is induced through a highly reflecting beamsplitter by a large amplitude coherent state, with probability 1/e in the limit of large coherent state amplitude. We use this effect to construct a viable implementation of the bare raising operator on coherent states via conditional measurement, which succeeds with high probability and fidelity even in the high amplitude limit.