Lecture 7

A charge qubit is usually operated at the charge degeneracy point, since

• the transition frequency is the smallest there.

• Since the T1 time is the longest there.

• Since the T2* time is the longest there.

• Since there it is insensitive to flux noise.

The two states of a charge qubit can be distinguished using capacitively coupled charge sensors.

• True

• False

The two states of a charge qubit can be distinguished using a superconducting resonator.

• True

• False

Which is the largest energy scale in the strong coupling regime?

What is the typical frequency of an SC resonator used for SC qubit readout?

• 10-200 kHZ

• 100 kHZ-1GHz

• 1-20 GHz

• 50-200 GHz

A resonator without any photons also shifts the qubit frequency for small detuning.

• True

• False

The Rabi frequency is determined by the RF frequency that is applied.

• True

• False

• True

• False

The number of photons in a cavity can be calculated from

• the Rabi frequency

• From the Stark shift

• From the Lamb shift

The measurement shows a charge qubit strongly coupled to a resonator. What is the interaction stength?

• ~1MHz

• ~10MHz

• ~100 MHz

• ~6.04 GHz