Single-shot optical readout of a quantum bit using cavity quantum electrodynamics

Abstract

We propose a method to perform single-shot optical readout of a quantum bit (qubit) using cavity quantum electrodynamics. We selectively couple the optical transitions associated with different qubit basis states to the cavity, and utilize the change in cavity transmissivity to generate a qubit readout signal composed of many photons. We show that this approach enables single-shot optical readout even when the qubit does not have a good cycling transition required for standard resonance fluorescence measurements. We calculate the probability that the measurement detects the correct spin state using the example of a quantum dot spin under various experimental conditions and demonstrate that it can exceed 0.99.

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• Multi-dimensional photonic states from a quantum dot
• Protocol for generating multi-photon entangled states from quantum dots in the presence of nuclear spin fluctuations
• Optical Manipulation of Quantum Dot Electron Spin Qubits Using Microcavity Quantum Well Exciton-Polaritons
• Resonator-assisted single molecule quantum state detection