Kavli Affiliate: Irfan Siddiqi
| First 5 Authors: Abhi D. Rajagopala, Akel Hashim, Neelay Fruitwala, Gang Huang, Yilun Xu
| Summary:
Standard compilers for quantum circuits decompose arbitrary single-qubit
gates into a sequence of physical X(pi/2) pulses and virtual-Z phase gates.
Consequently, many circuit classes implement different logic operations but
have an equivalent structure of physical pulses that only differ by changes in
virtual phases. When many structurally-equivalent circuits need to be measured,
generating sequences for each circuit is unnecessary and cumbersome, since
compiling and loading sequences onto classical control hardware is a primary
bottleneck in quantum circuit execution. In this work, we develop a
hardware-assisted protocol for executing parameterized circuits on our
FPGA-based control hardware, QubiC. This protocol relies on a hardware-software
co-design technique in which software identifies structural equivalency in
circuits and "peels" off the relevant parameterized angles to reduce the
overall waveform compilation time. The hardware architecture then performs
real-time "stitching" of the parameters in the circuit to measure circuits that
implement a different overall logical operation. This work demonstrates
significant speed ups in the total execution time for several different classes
of quantum circuits.
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