QCA Lecture 11

Qubits can be affected by a continuum of different errors.

• True

• False

Any quantum state can be perfectly copied using a well-engineered quantum circuit.

• True

• False

The quantum volume is a measure of ...

• ... a quantum computer's size (in cubic meters).

• ... a quantum computer's performance.

The quantum circuit in the figure accomplishes the encoding for the phase-flip code.

• True

• False

In the bit-flip code, the error is detected with projection operators. These projections automatically correct the bit-flip error.

• True

• False

Because of imperfections, it is theoretically impossible to run arbitrarily long computations on a quantum computer.

• True

• False

Which type of quantum error is in the figure?

• Bit-flip

• Phase-flip

• Bit-flip and phase-flip

What was the average readout error in Google's Sycamore chip in simultaneous operation?

• 1%

• 2%

• 4%

• 8%

The passive reset of a qubit happens on the timescale of ...

The 'full circle' data points are missing from the (b) plot because it would take too long to measure the full circuit.

• True

• False