Events

Tue April 30, 2019 4:00 pm

Lorenza Viola – Advances in Quantum Spectral Estimation by Qubit Sensors

Location:MIT 4-270
Lorenza Viola, Dartmouth
Ten Minute Talk:"Non-classical lasing in mixed-species spin-boson models" by Florentin Reiter

Accurately characterizing the spectral properties of environmental noise in open quantum systems is a prerequisite for quantitative modeling and prediction. In particular, gaining such detailed knowledge is a key step toward achieving noise-optimized control performance and boosting  fidelity in near-term quantum information processors, as well as for overcoming noise effects in quantum metrology.

The exquisite sensitivity of qubits to their surrounding environment makes them natural spectrometers of their own noise. In realistic settings, however, simplifying assumptions such as Gaussianity or classicality of the noise sources need not be a priori obeyed; furthermore, interpreting the sensor’s output may be complicated due to out-of-band spectral leakage.

In this talk, I will highlight some of our efforts in developing quantum control methods for spectral estimation by qubit sensors. Specifically, I will focus on recent advances in designing optimally band-limited protocols based on Slepian control modulation, as well as protocols for high-order spectral estimation inspired to dynamical decoupling. I will also outline proof-of-principle experimental validations using trapped-ion and superconducting qubit devices, and discuss emerging challenges.

Event type: