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Quantum Optical Coherence Tomography (Q-OCT) uses quantum properties of lightto provide several advantages over its classical counterpart, OCT: it achievesa twice better axial resolution with the same spectral bandwidth and it isimmune to even orders of dispersion. Since these features are very sought-afterin OCT imaging, many hardware and software techniques have been created tomimic the quantum behaviour of light and achieve these features usingtraditional OCT systems. The most recent, purely algorithmic scheme - animproved version of Intensity Correlation Spectral Domain OCT named ICA-SD-OCTshowed even-order dispersion cancellation and reduction of artefacts. The truecapabilities of this method were unfortunately severely undermined, both interms of its relation to Q-OCT and in terms of its main performance parameters.In this work, we provide experimental demonstrations as well as numerical andanalytical arguments to show that ICA-SD-OCT is a true classical equivalent ofQ-OCT, more specifically its Fourier domain version, and therefore it enables atrue two-fold axial resolution improvement. We believe that clarification ofall the misconceptions about this very promising algorithm will highlight thegreat value of this method for OCT and consequently lead to its practicalapplications for resolution- and quality-enhanced OCT imaging.

Intensity correlation OCT -- a true classical equivalent of quantum OCT able to achieve up to 2-fold resolution improvement in standard OCT images