2014/12/31 by Martin Bohmann, M. Bohmann, Jan Sperling +2 · 28 citations
Computer Science · Physics and Astronomy · #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum discord #Quantum entanglement #Quantum information science #Quantum limit #Quantum mechanics #Quantum metrology #Quantum network #Quantum sensor #Quantum state #Quantum teleportation #Statistical physics #quant-ph
paper · pdf · doi:10.1103/physreva.91.042332
published in Physical Review A 91(4) (American Physical Society)
openalex publication_date 2015/04/27 · arxiv created 2015/04/28 · arxiv updated 2015/04/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Quantum metrology and quantum information necessitate a profound study of suitable states. Attenuations induced by free-space communication links or fluctuations in the generation of such states limit the quantum enhancement in possible applications. For this reason we investigate quantum features of mixtures of so-called NOON states propagating in atmospheric channels. First, we show that noisy NOON states can still yield a phase resolution beyond classical limitations. Second, we identify entanglement of noisy NOON states after propagation in fluctuating loss channels. To do so, we apply the partial transposition criterion. Our theoretical analysis formulates explicit bounds which are indispensable for experimental verification of quantum entanglement and applications in quantum metrology.