Laboratoire Kastler-Brossel, ENS, UPMC-Paris 6, CNRS, 24 rue Lhomond, 75005 Paris, France.
Phys Rev Lett. 2012 Jun 15;108(24):243602. doi: 10.1103/PhysRevLett.108.243602.
Fock states with photon numbers n up to 7 are prepared on demand in a microwave superconducting cavity by a quantum feedback procedure that reverses decoherence-induced quantum jumps. Circular Rydberg atoms are used as quantum nondemolition sensors or as single-photon emitter or absorber actuators. The quantum nature of these actuators matches the correction of single-photon quantum jumps due to relaxation. The flexibility of this method is suited to the generation of arbitrary sequences of Fock states.
通过一种量子反馈程序，按需在微波超导腔中制备光子数 n 高达 7 的 Fock 态，该程序可反转退相干引起的量子跃迁。圆型里德堡原子被用作量子非破坏传感器或单光子发射器或吸收器致动器。这些致动器的量子性质与由于弛豫导致的单光子量子跃迁的校正相匹配。该方法的灵活性适用于生成任意序列的 Fock 态。
