TY - JOUR

T1 - Phase measurements at the theoretical limit

AU - Berry, D. W.

AU - Wiseman, H. M.

PY - 2001

Y1 - 2001

N2 - It is well known that the result of any phase measurement on an optical mode made using linear optics has an introduced uncertainty in addition to the intrinsic quantum phase uncertainty of the state of the mode. The best previously published technique [H. M. Wiseman and R. B. Killip, Phys. Rev. A 57, 2169 (1998)] is an adaptive technique that introduces a phase variance that scales as n̄-1.5, where n̄ is the mean photon number of the state. This is far above the minimum intrinsic quantum phase variance of the state, which scales as n̄-2. It has been shown that a lower limit to the phase variance that is introduced scales as ln(n̄)/n̄2. Here we introduce an adaptive technique that attains this theoretical lower limit.

AB - It is well known that the result of any phase measurement on an optical mode made using linear optics has an introduced uncertainty in addition to the intrinsic quantum phase uncertainty of the state of the mode. The best previously published technique [H. M. Wiseman and R. B. Killip, Phys. Rev. A 57, 2169 (1998)] is an adaptive technique that introduces a phase variance that scales as n̄-1.5, where n̄ is the mean photon number of the state. This is far above the minimum intrinsic quantum phase variance of the state, which scales as n̄-2. It has been shown that a lower limit to the phase variance that is introduced scales as ln(n̄)/n̄2. Here we introduce an adaptive technique that attains this theoretical lower limit.

UR - http://www.scopus.com/inward/record.url?scp=18344394011&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.63.013813

DO - 10.1103/PhysRevA.63.013813

M3 - Article

AN - SCOPUS:4243734751

VL - 63

SP - 1

EP - 9

JO - Physical Review A: covering atomic, molecular, and optical physics and quantum information

JF - Physical Review A: covering atomic, molecular, and optical physics and quantum information

SN - 2469-9926

IS - 1

M1 - 013813

ER -