Heisenberg-scaling angular displacement estimation with tunable squeezed Bell states
Jiandong Zhang, Zijing Zhang, Longzhu Cen, Junyan Hu, Yuan Zhe Zhao · Journal of Optics · 2019
Abstract Precise angular displacement estimation provides a route to correct the measurement bases of two parties in quantum teleportation. In this paper, we propose an angular momentum-enhanced estimation protocol deploying tunable squeezed Bell states and parity detection. The Heisenberg-scaling sensitivity and 2 ℓ + 1 -fold super-resolved oscillating fringes with quantum number ℓ are reachable in our protocol. We analyze the effect of tunable factor on sensitivity, and the advantages originating from spin and orbital angular momenta are also discussed.