SIGNAL (programming language)

Quantum mechanics

Quantum noise

Philosophy

Telecommunications

Computer science

Quantum sensor

Physics

Quantum entanglement

Ideal (ethics)

Quantum network

Image (mathematics)

Epistemology

Artificial intelligence

Quantum

Programming language

Radar

Noise (video)

Applied Physics Letters

We propose a novel protocol for quantum illumination: a quantum-enhanced noise radar. A two-mode squeezed state, which exhibits continuous-variable entanglement between so-called signal and idler beams, is used as input to the radar system. Compared to existing proposals for quantum illumination, our protocol does not require joint measurement of the signal and idler beams. This greatly enhances the practicality of the system by, for instance, eliminating the need for a quantum memory to store the idler. We perform a proof-of-principle experiment in the microwave regime, directly comparing the performance of a two-mode squeezed source to an ideal classical noise source that saturates the classical bound for correlation. We find that, even in the presence of significant added noise and loss, the quantum source outperforms the classical source by as much as an order of magnitude.

Quantum-enhanced noise radar