Parity detection achieves the Heisenberg limit in interferometry with coherent mixed with squeezed vacuum light
Parity detection achieves the Heisenberg limit in interferometry with coherent mixed with squeezed vacuum light
The interference between coherent and squeezed vacuum light can produce path entangled states with very high fidelities. We show that the phase sensitivity of the above interferometric scheme with parity detection saturates the quantum Cramer-Rao bound, which reaches the Heisenberg-limit when the coherent and squeezed vacuum light are mixed in …