首页|Low cross-talk optical addressing of trapped-ion qubits using a novel integrated photonic chip
Low cross-talk optical addressing of trapped-ion qubits using a novel integrated photonic chip
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Individual optical addressing in chains of trapped atomic ions requires the generation of many small,closely spaced beams with low cross-talk.Furthermore,implementing parallel operations necessitates phase,frequency,and amplitude control of each individual beam.Here,we present a scalable method for achieving all of these capabilities using a high-performance integrated photonic chip coupled to a network of optical fibre components.The chip design results in very low cross-talk between neighbouring channels even at the micrometre-scale spacing by implementing a very high refractive index contrast between the channel core and cladding.Furthermore,the photonic chip manufacturing procedure is highly fllexible,allowing for the creation of devices with an arbitrary number of channels as well as non-uniform channel spacing at the chip output.We present the system used to integrate the chip within our ion trap apparatus and characterise the performance of the full individual addressing setup using a single trapped ion as a light-field sensor.Our measurements showed intensity cross-talk below～10-3 across the chip,with minimum observed cross-talk as low as～10-5.
University of Oxford,Department of Physics,Oxford OX1 3PU,UK
University of Oxford,Department of Engineering Science,Oxford OX1 3PJ,UK
Institute of Biomedical Physics,Medical University of Innsbruck,Müllerstraße 44,6020 Innsbruck,Austria
UKRI FL FellowshipUS Army Research OfficeUK EPSRC Hub in Quantum Computing and SimulationEPSRC FellowshipMarie Curie Fellowship UKRI guaranteeAustrian Science FundSt.John's College,Oxford through a Junior Research FellowshipMerton College,Oxford for the sameJT Hamilton scholarship from Balliol College,Oxford
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