Kavli Affiliate: T. Higuchi
| First 5 Authors: T. Oshio, R. Nishimoto, T. Higuchi, K. Hayasaka, K. Koike
| Summary:
The quantum charge-coupled device (QCCD) is one of the notable architectures
to achieve large-scale trapped-ion quantum computers. To realize QCCD
architecture, ions must be transported quickly while minimizing motional
excitation. High-voltage sources are necessary to achieve such high-quality ion
transport through a high secular frequency. In this study, we report the
development of a field programmable gate array (FPGA)-based digital-to-analog
converter (DAC) system with an output voltage range of +/-50 V and demonstrate
its effectiveness in ion transport operations. The device provides 16-channel
analog output, maximum update rate of 16 mega updates per second (MUPS), slew
rate of 20 V/us, and bandwidth of > 200 kHz. By optimizing the voltage sets
with quadratic programming, we experimentally confirmed that this DAC system
can achieve more than twice the secular frequency attainable when its output
range is restricted to +/-10 V, which is consistent with the fact that scaling
all electrode voltages by a factor of 5 will scale the secular frequency by the
square root of 5. Since the output range of many commercially available DACs is
commonly limited to +/-10 V, this increase is effective for ion shuttling
operations, such as transport, split and merge. The developed DAC system has
potential to increase the speed of ion transport thereby reducing processing
times in QCCD-based quantum computers.
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