2015/11/30 by B. Kühn, Barbara Kühn, W. Vogel · 16 citations
Computer Science · Physics and Astronomy · #Coherent states #Cold Atom Physics and Bose-Einstein Condensates #Detector #Direct-conversion receiver #Homodyne detection #Local oscillator #Measure (data warehouse) #Observable #Operator (biology) #Optics #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum mechanics #Quantum optics #quant-ph
paper · pdf · doi:10.1103/physrevlett.116.163603
published in Physical Review Letters 116(16), 163603 (American Physical Society)
openalex publication_date 2016/04/19 · arxiv created 2016/04/20 · arxiv updated 2016/04/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A method is introduced that allows one to measure normal-ordered moments of the displaced photon-number operator up to higher orders, without the need of photon-number resolving detectors. It is based on unbalanced homodyne correlation measurements, with the local oscillator being replaced by a displaced dephased laser. The measured moments yield a simple approximation of quasiprobabilities, representing the full quantum state. Quantum properties of light are efficiently certified through normal-ordered observables directly accessible by our method, which is illustrated for a weakly squeezed vacuum and a single-photon-added thermal state.