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The Laser Interferometer Space Antenna (LISA) aims to observe gravitationalwaves in the mHz regime over its 10-year mission time. LISA will operate laserinterferometers between three spacecrafts. Each spacecraft will utilizeindependent clocks which determine the sampling times of onboard phasemeters toextract the interferometric phases and, ultimately, gravitational wave signals.To suppress limiting laser frequency noise, signals sampled by each phasemeterneed to be combined in postprocessing to synthesize virtual equal-arminterferometers. The synthesis in turn requires a synchronization of theindependent clocks. This article reports on the experimental verification of aclock synchronization scheme down to LISA performance levels using a hexagonaloptical bench. The development of the scheme includes data processing that isexpected to be applicable to the real LISA data with minor modifications.Additionally, some noise coupling mechanisms are discussed.

Experimental verification of intersatellite clock synchronization at LISA performance levels