Qubit-Coupled Mechanics - IFSC

Two-Tone Spectroscopy – ‘Extra’ Features
10
Qubit Absorption Spectrum Vs. Magnetic Flux
January 21st Data, 10dBm MW - Simulation: Ec=1.7GHz;Ej0=11.6GHz;
15
Microwave Frequency (GHz)
Microwave Frequency (GHz)
9
8
7
6
5
Working with Fred and
Amir Caldeira for model
including LC,CPB & NR
Unfortunately, sample
destroyed before fully
studied. .. We’re
making new ones now.
What is the
Extra Structure?
4
-1.5 -1 -0.5 0 0.5 1 1.5
Flux (π)
Flux (πΦ/Φ 0 )
- ‘Extra’ structure looks like a series of avoided-level crossings
- Can’t rule out multi-photon processes , longitudinal dressed states, etc. (e.g. ~10 photons in LC)
- Could it be related to the mechanical resonator? ~300 MHz spacing is suggestive
10.5
10.0
9.5
10
Higher resolution spectroscopy
5
0
-5
-10
-0.5 0.0
0.5
-15
-20
LC
Phase
(Deg.)
~300 MHz
~300 MHz