title: Enhancing entangled-state phase estimation by combining classical and quantum protocols.
abstract: Here we describe a laboratory procedure by which we have increased the resolution of a measurement of the position of an optical component by a factor of 16. The factor of 16 arises from a four-fold quantum enhancement through the use of an N = 4 N00N state and a four-fold classical enhancement from a quadruple pass through a prism pair. The possibility of achieving supersensitivity using this method is discussed.
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87123, USA. heedeuk.shin@gmail.com
authors.forename: Heedeuk
authors.initials: H
authors.lastname: Shin
authors.forename: Omar S
authors.initials: OS
authors.lastname: Magaña-Loaiza
authors.forename: Mehul
authors.initials: M
authors.lastname: Malik
authors.forename: Malcolm N
authors.initials: MN
authors.lastname: O'Sullivan
authors.forename: Robert W
authors.initials: RW
authors.lastname: Boyd
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D011789:Quantum Theory; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods*; D012542:Scattering, Radiation