Optical interferometry is amongst the most sensitive techniques for precision measurement. By increasing the light intensity, a more precise measurement can usually be made. However, if the sample is light sensitive entangled states can achieve the same precision with less exposure. This concept has been demonstrated in measurements of known optical components. Here, we use two-photon entangled states to measure the concentration of a blood protein in an aqueous buffer solution. We use an opto-fluidic device that couples a waveguide interferometer with a microfluidic channel. These results point the way to practical applications of quantum metrology to light-sensitive samples. © 2012 American Institute of Physics.
Measuring protein concentration with entangled photons / Crespi, A.; Lobino, M.; Matthews, J. C. F.; Politi, A.; Neal, C. R.; Ramponi, R.; Osellame, R.; O'Brien, J. L.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 100:23(2012), p. 233704. [10.1063/1.4724105]
Measuring protein concentration with entangled photons
Lobino M.;
2012-01-01
Abstract
Optical interferometry is amongst the most sensitive techniques for precision measurement. By increasing the light intensity, a more precise measurement can usually be made. However, if the sample is light sensitive entangled states can achieve the same precision with less exposure. This concept has been demonstrated in measurements of known optical components. Here, we use two-photon entangled states to measure the concentration of a blood protein in an aqueous buffer solution. We use an opto-fluidic device that couples a waveguide interferometer with a microfluidic channel. These results point the way to practical applications of quantum metrology to light-sensitive samples. © 2012 American Institute of Physics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
