\textit{In situ} isotopic enrichment and growth of $^{28}$ Si for quantum information\textit{In situ} isotopic enrichment and growth of $^{28}$Si for quantum information

Kevin Dwyer, Joshua M. Pomeroy

Bulletin of the American Physical SocietyMar 21, 20130 citations

Targeted enrichment of 28 Si for quantum computing

Ke Tang, Hyunsoo Kim, Aruna N. Ramanayaka +2 more

Bulletin of the American Physical SocietyMar 4, 20190 citations

Observation of multiple exchange oscillation frequencies in Si/SiGe spin qubits

Matthew T. Rakher

Bulletin of the American Physical SocietyMar 14, 20160 citations

Noise-compensating pulses for electrostatically controlled silicon spin qubits

Xin Wang, F. A. Calderon-Vargas, Muhed S. Rana +3 more

We study the performance of supcode---a family of dynamically correcting pulses designed to cancel simultaneously both Overhauser and charge noise for singlet-triplet spin qubits---adapted to silicon devices with electrostatic control. We consider both natural Si and isotope-enriched Si systems, and in each case we investigate the behavior of individual gates under static noise and perform randomized benchmarking to obtain the average gate error under realistic $1/f$ noise. We find that in most cases supcode pulses offer roughly an order of magnitude reduction in gate error, and especially in the case of isotope-enriched Si, supcode yields gate operations of very high fidelity. We also develop a version of supcode that cancels the charge noise only, ``$\ensuremath{\delta}J$-supcode,'' which is particularly beneficial for isotope-enriched Si devices where charge noise dominates Overhauser noise, offering a level of error reduction comparable to the original supcode while yielding gate times that are $30%--50%$ shorter. Our results show that the supcode noise-compensating pulses provide a fast, simple, and effective approach to error suppression, bringing gate errors well below the quantum error correction threshold in principle.We study the performance of supcode---a family of dynamically correcting pulses designed to cancel simultaneously both Overhauser and charge noise for singlet-triplet spin qubits---adapted to silicon devices with electrostatic control. We consider both natural Si and isotope-enriched Si systems, and in each case we investigate the behavior of individual gates under static noise and perform randomized benchmarking to obtain the average gate error under realistic $1/f$ noise. We find that in most cases supcode pulses offer roughly an order of magnitude reduction in gate error, and especially in the case of isotope-enriched Si, supcode yields gate operations of very high fidelity. We also develop a version of supcode that cancels the charge noise only, ``$\ensuremath{\delta}J$-supcode,'' which is particularly beneficial for isotope-enriched Si devices where charge noise dominates Overhauser noise, offering a level of error reduction comparable to the original supcode while yielding gate times that are $30%--50%$ shorter. Our results show that the supcode noise-compensating pulses provide a fast, simple, and effective approach to error suppression, bringing gate errors well below the quantum error correction threshold in principle.

arXiv:1407.1555Physical Review BOct 14, 201423 citations

An Exchange-Only Qubit in Isotopically Enriched

^{28}

\textit{In situ} isotopic enrichment and growth of

^{28}

Si for quantum information

1/f

noise. We find that in most cases supcode pulses offer roughly an order of magnitude reduction in gate error, and especially in the case of isotope-enriched Si, supcode yields gate operations of very high fidelity. We also develop a version of supcode that cancels the charge noise only, ``$\ensuremath{\delta}J$-supcode,'' which is particularly beneficial for isotope-enriched Si devices where charge noise dominates Overhauser noise, offering a level of error reduction comparable to the original supcode while yielding gate times that are

30%--50%

shorter. Our results show that the supcode noise-compensating pulses provide a fast, simple, and effective approach to error suppression, bringing gate errors well below the quantum error correction threshold in principle.