Modelling and simulation in circuit quantum electrodynamics from optical nonlinearities to high fidelity qubit state measurement

When?

Thursday 22 March 2012 to 13:00

Where?

02ATI02

Open to:

Students, Staff

Speaker:

Dr Eran Ginossar, Advanced Technology Institute, University of Surrey

The field of circuit quantum electrodynamics [1-3] describes the physics of artificial solid state based qubits strongly coupled to electromagnetic modes in superconducting resonators. These systems are fabricated on a chip and designed to perform basic quantum information processing. These devices behave as a few-body interacting systems out of equilibrium whose transient dynamics needs to be accurately controlled on short time scales compared to the relaxation and decoherence times. In addition, subtle quantum optical effects and interactions have been demonstrated in these systems such as number splitting and synthesis of arbitrary photonic Fock states.

Recently, high drive power experiments in circuit quantum electrodynamics were done in the strong coupling and dispersive regime of a single artificial qubit and a linear microwave resonator for the purpose of developing high-fidelity qubit state measurement. High fidelity qubit state measurement in solid state systems is the subject of much recent experimental and theoretical research. Achieving high fidelity in a single-shot measurement is an interesting quantum control problem, as well as an important component for the successful implementation of quantum information protocols. We will discuss theoretical and experimental advances for superconducting qubits that employ strong signals to probe the system [4-6] as well as recent modelling and quantum simulations challenges in this regime.