workbench_algorithms.subroutines.block_encoding

Main Qubricks for block encoding implementations.

LCU

LCU(
    state_prep: StatePreparation,
    select: Select,
    **kwargs: dict[str, Any],
)

Bases: Qubrick

Implements a general block encoding using Linear Combination of Unitaries (LCU).

Constructs the block encoding as \(\text{PREP}-\text{SELECT}-\text{PREP}^\dagger\) using provided Qubrick implementations of SELECT and PREP.

Parameters:

Name	Type	Description	Default
state_prep	StatePreparation	A Qubrick implementing a state preparation (PREP) subroutine	required
select	Select	A Qubrick implementing a select (SELECT) subroutine	required
**kwargs	dict[str, Any]	Other arguments to pass to the init.	{}

compute

compute(
    psi: Qubits,
    be_ancilla_reg: Qubits,
    data: PauliSum | list[int],
    ctrl: Qubits | int = 0,
    **kwargs: dict[str, Any],
)

Compute the block encoding.

Parameters:

Name	Type	Description	Default
psi	Qubits	Target state register.	required
be_ancilla_reg	Qubits	Block encoding auxiliary register.	required
data	PauliSum | list[int]	Hamiltonian or bitstring values to be block-encoded.	required
ctrl	Qubits | int	Register to control on. Defaults to None.	0
**kwargs	dict[str, Any]	Extra kwargs to maintain compatibility with other Qubricks.	{}