We present NPL’s recent contributions to timekeeping applications of optical clocks. The first of these in-volves optical clocks at NPL and SYRTE being simultaneously used to steer experimental time scales, in a similar manner to Cs fountains steering the national time scales. The resulting optically-steered time scales at NPL and SYRTE (denoted UTCx(NPL) and UTCx(OP) respectively) will be presented along with compari-sons against both Coordinated Universal Time (UTC) and each other via satellite techniques.
We will then present how optical clocks can be used in the evaluation and steering of International Atomic Time (TAI) and, subsequently, UTC – a feat which has recently been achieved by NPL’s Sr lattice optical clock. We will discuss the process by which this was achieved, and we will show the recent frequency data and analysis that has been used to perform recent calibrations of TAI.
We report on the development of a transportable iodine frequency stabilized laser setup, based on compact-fibered frequency tripled Telecom laser, locked to the a10 hyperfine component of the 127I 2 line at 532.245 nm. Therefore, a tandem of Nd: YAG lasers are phase-locked to this reference laser and used for precise interferometry measurements as part of the French activities in the frame of LISA-France consortium, led by the French space agency (CNES). The frequency stability transfer from 1596 nm to the LISA nominal wavelength at 1064.49 nm is fulfilled in a simple manner [1], using the usual phase locking loop technique associated to a second harmonic generation process. The compact design of the whole setup will make it easily transportable and can be readily used on different sites.
Iterative schemes have a great potential for efficient production of complex quantum states of light. This concept refers to generation protocols working on a set of quantum states, starting from basic resources as single-photon states, and building the target in several steps through the implementation of simple quantum operations on the intermediate states. This constitutes a quantum algorithm and requires a basic quantum processor. In this talk we will discuss all-optical architectures for that purpose, based on optical cavities and fast optical switches coupled to a fast-rate single photon source.
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