t2_circuits¶
- t2_circuits(num_of_gates, gate_time, qubits, n_echos=1, phase_alt_echo=False)[source]¶
Generate circuits for T2 (echo) measurement, by a CPMG sequence.
- Each circuit consists of:
\(Y90-t-Y-[t-t-X/Y]^m-t-Y90\)
\(n_{echos} = n+1\)
if phase_alt_echo then the X/Y alternate, if phase_alt_echo=False tthen he pulses are always Y
Standard T2* echo is \(n_echos=1\)
- Parameters
num_of_gates (
Union[List[int],array]) – Each element of the list corresponds to a circuit. num_of_gates[i] is the number of identity gates in each section “t” of the pulse sequence in circuit no. i. Must be in an increasing order.gate_time (
float) – time of running a single identity gate.qubits (
List[int]) – indices of the qubits whose T2*‘s are to be measured.n_echos (
int) – number of echo gates (X or Y).phase_alt_echo (
bool) – if True then alternate the echo between X and Y.
- Return type
Tuple[List[QuantumCircuit],array]- Returns
Generated circuits
Delay times, i.e., gate_time multiplied by the numbers in num_of_gates
- Raises
ValueError – If n_echos is less than 1