Physics Department Colloquium: Tuesday, January 14th, 2020 - Quantum information processing using multimode circuit-QED

Event Date: 

Tuesday, January 14, 2020 - 3:45pm

Event Date Details: 

Refreshments served at 3:30pm.

Event Location: 

  • Broida 1640
  • Physics Department Colloquium

Superconducting circuits have emerged as one of the most promising platforms for quantum computation as a result of rapid advances in coherence and control over the past few decades. Most modern superconducting processors are based on the transmon circuit, and rely on nearest-neighbor interactions for gate operations and entanglement. In this talk, I will present an alternative architecture for superconducting quantum information and simulation, involving many harmonic modes of a multimode cavity coupled and controlled by a single transmon circuit. This multimode circuit-QED system leverages the long coherence times and restricted decoherence channels of superconducting microwave cavities. Additionally, the architecture has a high degree of connectivity while being hardware efficient, with gate operations performed between arbitrary pairs of cavity modes using only a few control lines that drive the transmon. Our implementation of such a processor uses - the quantum flute, a novel rectangular 3D multimode cavity with a tailored mode dispersion, that is protected from seam loss and possesses ~10 distinct modes with photon lifetimes approaching a millisecond. I will present various schemes for universal control of the multimode Hilbert space using the dispersively coupled transmon, and discuss schemes for engineering designer photon-photon interactions.