2009/07/31 by Makoto Takeuchi, Nobuyuki Takei, Kodai Doi +3 · 12 citations
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Mechanical and Optical Resonators #Physics #Quantum #Quantum Information and Cryptography #Quantum mechanics #Qubit #Realization (probability) #Spin (aerodynamics) #Spin polarization #quant-ph
paper · pdf · doi:10.1103/physreva.81.062308
published in Physical Review A 81(6) (American Physical Society) · 5 pages, 5 figures
arxiv created 2010/04/28 · openalex publication_date 2010/06/09 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We constructed a cavity QED system with a diamagnetic atom of 171Yb and performed projective measurements on a single nuclear spin. Since Yb has no electronic spin and has 1/2 nuclear spin, the procedure of spin polarization and state verification can be dramatically simplified compared with the pseudo-spin-1/2 system. By enhancing the photon emission rate of the 1S0-3P1 transition, projective measurement is implemented for an atom with the measurement time of Tmeas=30 \mathrm\ensuremathμs. Unwanted spin flip and dark counts of the detector lead to systematic error when the present technique is applied for the determination of diagonal elements of an unknown spin state, which is \ensuremathδ|\ensuremathβ|2\ensuremath\leqslant2\ifmmode×\else\texttimes\fi10^\ensuremath-2. Fast measurement on a long-lived qubit is key to the realization of large-scale one-way quantum computing.