TY  - JOUR
A1  - Gietka, Karol
A1  - Wasak, Tomasz
A1  - Chwedeńczuk, Jan
A1  - Piazza, Francesco
A1  - Ritsch, Helmut
T1  - Quantum-enhanced interferometry with cavity QED-generated non-classical light
T2  - The European Physical Journal D
N2  - We propose an enhanced optical interferometer based on tailored non-classical light generated by nonlinear dynamics and projective measurements in a three-level atom cavity QED system. A coherent state in the cavity becomes dynamically entangled with two ground states of the atom and is transformed to a macroscopic superposition state via a projective measurement on the atom. We show that the resulting highly non-classical state can improve interferometric precision measurements well beyond the shot-noise limit once combined with a classical laser pulse at the input of a Mach–Zehnder interferometer. For a practical implementation, we identify an efficient phase shift estimation scheme based on the counting of photons at the interferometer output. Photon losses and photon-counting errors deteriorate the interferometer sensitivity, but we demonstrate that it still can be significantly better than the shot-noise limit under realistic conditions.
KW  - Atomic and Molecular Physics, and Optics
Y1  - 2017
UR  - https://opus.bibliothek.uni-augsburg.de/opus4/frontdoor/index/index/docId/108378
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:384-opus4-1083785
SN  - 1434-6060
SN  - 1434-6079
VL  - 71
IS  - 11
SP  - 273
PB  - Springer Science and Business Media LLC
ER  -