Alexandria Digital Research Library

Fast, accurate state measurement in superconducting qubits

Author:
Sank, Daniel Thomas
Degree Grantor:
University of California, Santa Barbara. Physics
Degree Supervisor:
John M. Martinis
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2014
Issued Date:
2014
Topics:
Physics, Condensed Matter and Physics, Theory
Keywords:
Quantum
Qubit
Measurement
Genres:
Dissertations, Academic and Online resources
Dissertation:
Ph.D.--University of California, Santa Barbara, 2014
Description:

Superconducting qubits have emerged as leading candidates as the foundation of quantum information processing systems. Progress in superconducting qubit experiments with greater numbers of qubits and advanced techniques such as feedback will require faster and more accurate quantum state measurement. In particular, cyclic fault tolerance protocols such as the surface code require high accuracy measurement on time scales significantly shorter than the coherence times of the qubits. We have designed a multiplexed measurement system with a bandpass filter that allows fast measurement without increasing environmental damping of the qubits. We use this to demonstrate simultaneous measurement of four qubits on a single superconducting integrated circuit, finding that we can measured a single qubit state to 99.8% accuracy in 140 ns. This accuracy and speed is suitable for advanced multiqubit experiments including surface-code error correction.

Physical Description:
1 online resource (229 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3w0942t
ISBN:
9781321350050
Catalog System Number:
990045117550203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
Daniel Sank
File Description
Access: Public access
Sank_ucsb_0035D_12320.pdf pdf (Portable Document Format)