cirq.GridQid

View source on GitHub

A qid on a 2d square lattice

Inherits From: Qid

cirq.GridQid(
    row: int, col: int, *, dimension: int
) -> 'cirq.GridQid'

GridQid uses row-major ordering:

GridQid(0, 0, dimension=2) < GridQid(0, 1, dimension=2)
< GridQid(1, 0, dimension=2) < GridQid(1, 1, dimension=2)

New GridQid can be constructed by adding or subtracting tuples or numpy arrays

cirq.GridQid(2, 3, dimension=2) + (3, 1)
cirq.GridQid(5, 4, dimension=2)
cirq.GridQid(2, 3, dimension=2) - (1, 2)
cirq.GridQid(1, 1, dimension=2)
cirq.GridQid(2, 3, dimension=2) + np.array([3, 1], dtype=int)
cirq.GridQid(5, 4, dimension=2)

Args
row	the row coordinate
col	the column coordinate
dimension	The dimension of the qid's Hilbert space, i.e. the number of quantum levels.

Attributes
col
dimension	Returns the dimension or the number of quantum levels this qid has. E.g. 2 for a qubit, 3 for a qutrit, etc.
row

Methods

from_diagram

View source

@staticmethod
from_diagram(
    diagram: str, dimension: int
) -> List['GridQid']

Parse ASCII art device layout into a device.

As an example, the below diagram will create a list of GridQid in a pyramid structure.

---A---
--AAA--
-AAAAA-
AAAAAAA

You can use any character other than a hyphen, period or space to mark a qid. As an example, the qids for a Bristlecone device could be represented by the below diagram. This produces a diamond-shaped grid of qids, and qids with the same letter correspond to the same readout line.

.....AB.....
....ABCD....
...ABCDEF...
..ABCDEFGH..
.ABCDEFGHIJ.
ABCDEFGHIJKL
.CDEFGHIJKL.
..EFGHIJKL..
...GHIJKL...
....IJKL....
.....KL.....

Args
diagram	String representing the qid layout. Each line represents a row. Alphanumeric characters are assigned as qid. Dots ('.'), dashes ('-'), and spaces (' ') are treated as empty locations in the grid. If diagram has characters other than alphanumerics, spacers, and newlines ('\n'), an error will be thrown. The top-left corner of the diagram will be have coordinate (0, 0).
dimension	The dimension of the qubits in the cirq.GridQids used in this construction.

Returns
A list of cirq.GridQids corresponding to qids in the provided diagram

Raises
ValueError	If the input string contains an invalid character.

is_adjacent

View source

is_adjacent(
    other: 'cirq.Qid'
) -> bool

Determines if two qubits are adjacent qubits.

neighbors

View source

neighbors(
    qids: Optional[Iterable[ops.Qid]] = None
) -> Set['_BaseGridQid']

Returns qubits that are potential neighbors to this GridQid

Args
qids	optional Iterable of qubits to constrain neighbors to.

rect

View source

@staticmethod
rect(
    rows: int, cols: int, top: int = 0, left: int = 0, *, dimension: int
) -> List['GridQid']

Returns a rectangle of GridQid.

Args
rows	Number of rows in the rectangle
cols	Number of columns in the rectangle
top	Row number of the topmost row
left	Column number of the leftmost row
dimension	The dimension of the qid's Hilbert space, i.e. the number of quantum levels.

Returns
A list of GridQid filling in a rectangular grid

square

View source

@staticmethod
square(
    diameter: int, top: int = 0, left: int = 0, *, dimension: int
) -> List['GridQid']

Returns a square of GridQid.

Args
diameter	Length of a side of the square
top	Row number of the topmost row
left	Column number of the leftmost row
dimension	The dimension of the qid's Hilbert space, i.e. the number of quantum levels.

Returns
A list of GridQid filling in a square grid

validate_dimension

View source

@staticmethod
validate_dimension(
    dimension: int
) -> None

Raises an exception if dimension is not positive.

Raises
ValueError	dimension is not positive.

with_dimension

View source

with_dimension(
    dimension: int
) -> 'GridQid'

Returns a new qid with a different dimension.

Child classes can override. Wraps the qubit object by default.

Args
dimension	The new dimension or number of levels.

__add__

View source

__add__(
    other: Union[Tuple[int, int], Self]
) -> Self

__eq__

View source

__eq__(
    other
) -> bool

Return self==value.

__ge__

View source

__ge__(
    other
) -> bool

Return self>=value.

__gt__

View source

__gt__(
    other
) -> bool

Return self>value.

__le__

View source

__le__(
    other
) -> bool

Return self<=value.

__lt__

View source

__lt__(
    other
) -> bool

Return self<value.

__ne__

View source

__ne__(
    other
) -> bool

Return self!=value.

__neg__

View source

__neg__() -> Self

__radd__

View source

__radd__(
    other: Tuple[int, int]
) -> Self

__rsub__

View source

__rsub__(
    other: Tuple[int, int]
) -> Self

__sub__

View source

__sub__(
    other: Union[Tuple[int, int], Self]
) -> Self