iqm.cirq_iqm.iqm_gates.IQMMoveGate#

class iqm.cirq_iqm.iqm_gates.IQMMoveGate(*, exponent: float | Expr = 1.0, global_shift: float = 0.0)#

Bases: EigenGate

The MOVE operation is a unitary population exchange operation between a qubit and a resonator. Its effect is only defined in the invariant subspace $S=\text{span}\{|00⟩,|01⟩,|10⟩\}$, where it swaps the populations of the states $|01⟩$ and $|10⟩$. Its effect on the orthogonal subspace is undefined.

MOVE has the following presentation in the subspace $S$:

$${\text{MOVE}}_S=|00⟩⟨00|+a|10⟩⟨01|+a^{-1}|01⟩⟨10|,$$

where $a$ is an undefined complex phase that is canceled when the MOVE gate is applied a second time.

To ensure that the state of the qubit and resonator has no overlap with $|11⟩$, it is recommended that no single qubit gates are applied to the qubit in between a pair of MOVE operations.

Note: At this point the locus for the move gate must be defined in the order: [qubit, resonator]. Additionally, the matrix representation of the gate set to be a SWAP gate, even though this is not what physically happens.

Attributes

Methods

__str__()	Return str(self).
_circuit_diagram_info_(args)
_eigen_components()	Describes the eigendecomposition of the gate's matrix.
_num_qubits_()	The number of qubits this gate acts on.
_qid_shape_()	Returns a Tuple containing the number of quantum levels of each qid the gate acts on.
num_qubits()	The number of qubits this gate acts on.

Parameters:

• exponent (float | Expr) –

• global_shift (float) –

num_qubits() → int#

The number of qubits this gate acts on.

Return type:

int