Optimisation of diamond quantum processors
| Autor: | Sophie Stearn, Marcus W. Doherty, YunHeng Chen, Scott Vella, Andrew Horsley |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Quantum Physics Quantum decoherence Field (physics) Spins Quantum sensor General Physics and Astronomy Diamond FOS: Physical sciences engineering.material Optimal control 01 natural sciences 010305 fluids & plasmas Computational science Computer Science::Hardware Architecture 0103 physical sciences engineering 010306 general physics Quantum Physics (quant-ph) Quantum Quantum computer |
| DOI: | 10.48550/arxiv.2002.00545 |
| Popis: | Diamond quantum processors consisting of a nitrogen-vacancy (NV) centre and surrounding nuclear spins have been the key to significant advancements in room-temperature quantum computing, quantum sensing and microscopy. The optimisation of these processors is crucial for the development of large-scale diamond quantum computers and the next generation of enhanced quantum sensors and microscopes. Here, we present a full model of multi-qubit diamond quantum processors and develop a semi-analytical method for designing gate pulses. This method optimises gate speed and fidelity in the presence of random control errors and is readily compatible with feedback optimisation routines. We theoretically demonstrate infidelities approaching $\sim 10^{-5}$ for single-qubit gates and established evidence that this can also be achieved for a two-qubit CZ gate. Consequently, our method reduces the effects of control errors below the errors introduced by hyperfine field misalignment and the unavoidable decoherence that is intrinsic to the processors. Having developed this optimal control, we simulated the performance of a diamond quantum processor by computing quantum Fourier transforms. We find that the simulated diamond quantum processor is able to achieve fast operations with low error probability. Comment: Published version. Updated references, additional analysis for the infidelities of CZ gate. Two new appendices on discussing the effects of time-ordering in the quantum evolution and examining the effects of the secular approximation and hyperfine field misalignments on gate fidelities. Adjusted the discussions and claims accordingly |
| Databáze: | OpenAIRE |
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