title: Quantum metrology with entangled coherent states.
abstract: We present an improved phase estimation scheme employing entangled coherent states and demonstrate that these states give the smallest variance in the phase parameter in comparison to NOON, "bat," and "optimal" states under perfect and lossy conditions. As these advantages emerge for very modest particle numbers, the optical version of entangled coherent state metrology is achievable with current technology.
authors.affiliation: Quantum Information Science, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom.
authors.forename: Jaewoo
authors.initials: J
authors.lastname: Joo
authors.forename: William J
authors.initials: WJ
authors.lastname: Munro
authors.forename: Timothy P
authors.initials: TP
authors.lastname: Spiller