2011/05/31 by Kaushik P. Seshadreesan, Petr M. Anisimov, Hwang Lee +1
Computer Science · Physics and Astronomy · #Coherent states #Heisenberg limit #Interference (communication) #Interferometry #Limit (mathematics) #Logarithm #Mathematical analysis #Parity (physics) #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum limit #Quantum mechanics #Quantum optics and atomic interactions #Squeezed coherent state #Vacuum state #quant-ph
paper · pdf · doi:10.1088/1367-2630/13/8/083026
published as New Journal of Physics vol. 13, no. 8, article no. 083026, August 2011 · Change in the format from aps to iop since we decided to submit it to NJP; Minor changes in text
arxiv created 2011/06/02 · openalex publication_date 2011/08/24 · arxiv updated 2015/08/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The interference between coherent and squeezed vacuum light effectively produces path entangled N00N 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 roughly equal proportions. For the same interferometric scheme, we draw a detailed comparison between parity detection and a symmetric-logarithmic-derivative-based detection scheme suggested by Ono and Hofmann.