PhD Proposal: Ralph Colmenar
Location
Physics : 401
Date & Time
December 3, 2018, 1:00 pm – 2:30 pm
Description
ADVISOR: Dr. Jason Kestner
TITLE: Generating Dynamically-Corrected Geometric Gates in Quantum Dot Spin Qubits
ABSTRACT: Electron spins in semiconductor quantum dots are promising platforms for quantum computing due to their long coherence times and potential scalability. However, realizing a practical quantum computer remains a challenging task due to the effects of decoherence. This is typically induced by noise in experiments and makes long-term retention and accurate processing of quantum information very difficult. Although techniques based on the theory of dynamical error correction are often employed to mitigate these effects, they are not effective at dealing with high-frequency noise. This issue can potentially be resolved by using geometric quantum gates to evolve qubits, which are conjectured to be insensitive against high-frequency fluctuations in the control parameters but can be sensitive to quasistatic noise. Therefore, we present a research proposal to combine the theory of dynamical error correction with geometric quantum computation. This approach can potentially mitigate a spectrum of noise frequencies wider than what is achievable with existing control protocols and allow generation of 1- and 2-qubit gates with fidelities well above the fault-tolerant threshold.
TITLE: Generating Dynamically-Corrected Geometric Gates in Quantum Dot Spin Qubits
ABSTRACT: Electron spins in semiconductor quantum dots are promising platforms for quantum computing due to their long coherence times and potential scalability. However, realizing a practical quantum computer remains a challenging task due to the effects of decoherence. This is typically induced by noise in experiments and makes long-term retention and accurate processing of quantum information very difficult. Although techniques based on the theory of dynamical error correction are often employed to mitigate these effects, they are not effective at dealing with high-frequency noise. This issue can potentially be resolved by using geometric quantum gates to evolve qubits, which are conjectured to be insensitive against high-frequency fluctuations in the control parameters but can be sensitive to quasistatic noise. Therefore, we present a research proposal to combine the theory of dynamical error correction with geometric quantum computation. This approach can potentially mitigate a spectrum of noise frequencies wider than what is achievable with existing control protocols and allow generation of 1- and 2-qubit gates with fidelities well above the fault-tolerant threshold.
