Scientists have developed a new Quantum Optical Coherence Tomography (QOCT) technique that promises significant improvements in speed and dispersion control. This advance could revolutionize biomedical imaging and other applications requiring high resolution and sensitivity. QOCT is an imaging technique that leverages the quantum properties of light, specifically photon entanglement, to overcome the limitations of conventional Optical Coherence Tomography (OCT), such as chromatic dispersion and noise.

The key to this improvement lies in implementing QOCT in the Fourier domain, which allows for faster data acquisition. Furthermore, the technique incorporates active dispersion control, a critical factor that often degrades image quality in optical systems. By manipulating dispersion in a controlled manner, researchers can maintain the coherence of entangled photons over longer distances, resulting in sharper and deeper images. This approach represents a step forward in overcoming the technical challenges associated with applying quantum phenomena in practical settings.

The developed method uses entangled photon pairs generated via spontaneous parametric down-conversion. One photon is used as a reference, while the other interacts with the sample. Joint detection of these photons allows for the reconstruction of a sample image with a resolution not limited by dispersion in the same way as in classical OCT. The ability to actively control dispersion is crucial for maintaining the integrity of quantum information as light passes through different media, which is especially relevant in heterogeneous biological tissues. The results demonstrate a substantial improvement in signal-to-noise ratio and penetration capability compared to previous QOCT techniques.