2021/03/12 by Miao Zhang, Haijun Kang, Meihong Wang +3
Computer Science · Physics and Astronomy · #Coherence (philosophical gambling strategy) #Electromagnetically induced transparency #Quantum #Quantum Information and Cryptography #Quantum decoherence #Quantum imaging #Quantum information #Quantum optics #Quantum optics and atomic interactions #Quantum sensor #Quantum state #Rubidium #Spectroscopy and Quantum Chemical Studies #quant-ph
paper · pdf · doi:10.1364/prj.418417
published as Photonics Research 9, 887 (2021)
openalex publication_date 2021/03/12 · openalex created_date 2021/03/29 · arxiv created 2021/04/28 · arxiv updated 2021/05/07 · openalex updated_date 2026/08/05
The optical cat state plays an essential role in quantum computation and quantum metrology. Here, we experimentally quantify quantum coherence of an optical cat state by means of relative entropy and the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>l</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> norm of coherence in a Fock basis based on the prepared optical cat state at the rubidium D1 line. By transmitting the optical cat state through a lossy channel, we also demonstrate the robustness of quantum coherence of the optical cat state in the presence of loss, which is different from the decoherence properties of fidelity and Wigner function negativity of the optical cat state. Our results confirm that quantum coherence of optical cat states is robust against loss and pave the way for the application of optical cat states.