Speaker: Dr. Chiao-Hsuan Wang, University of Chicago, USA

Time: 1:20 p.m, 12/14, 2020

Place: R124, Department of Physics
 

Title: 
Quantum Information Processing via Photon-Number Dependent Hamiltonian Engineering

Abstract:
Cavity resonators are promising resources for quantum technology, while native 
nonlinear interactions for cavities are typically too weak to provide the level of 
quantum control required to deliver complex targeted operations.  I will present a 
scheme to engineer a target Hamiltonian for photonic cavities using ancilla qubits. 
By off-resonantly driving dispersively coupled ancilla qubits, we develop an 
optimized approach to engineering an arbitrary photon-number dependent (PND) 
Hamiltonian for the cavities while minimizing the operation errors.  The engineered 
Hamiltonian admits various applications including canceling unwanted cavity self 
Kerr interactions, creating higher-order nonlinearities for quantum simulations, and 
designing single- and two-cavity gates resilient to noise.  Our scheme can be 
implemented with coupled microwave cavities and transmon qubits in superconducting 
circuit systems.  This work paves the way for near-term applications of noisy 
intermediate-scale quantum devices as well as long-term goal of fault-tolerant 
quantum computations.