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The resolution of optical interference is ultimately limited by the wavelength of light, which is known as Rayleigh criterion. Interestingly, this limitation could be surpassed by considering photonic de Broglie wave [1], and the resulting subwavelength interference is useful for lithography [2] and super-resolving phase measurement [3]. Usually, quantum entangled state is necessary to realize photonic...
‘High-NOON’ states were generated by multiphoton interference of ‘quantum’ down-converted light with a ‘classical’ coherent state. Super-resolving phase measurements with up to five entangled photons were demonstrated with a visibility higher than obtainable without entanglement.
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