cirq.LineQid

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A qid on a 1d lattice with nearest-neighbor connectivity.

Inherits From: Qid

cirq.LineQid(
    x: int, dimension: int
) -> 'cirq.LineQid'

Used in the notebooks

Used in the tutorials
Qudits

LineQids have a single attribute, and integer coordinate 'x', which identifies the qids location on the line. LineQids are ordered by this integer.

One can construct new cirq.LineQids by adding or subtracting integers:

cirq.LineQid(1, dimension=2) + 3
cirq.LineQid(4, dimension=2)

cirq.LineQid(2, dimension=3) - 1
cirq.LineQid(1, dimension=3)

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

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

Methods

for_gate

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@staticmethod
for_gate(
    val: Any, start: int = 0, step: int = 1
) -> List['LineQid']

Returns a range of line qids with the same qid shape as the gate.

Args
val	Any value that supports the cirq.qid_shape protocol. Usually a gate.
start	The x coordinate of the first LineQid.
step	The amount to increment each x coordinate.

for_qid_shape

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@staticmethod
for_qid_shape(
    qid_shape: Sequence[int], start: int = 0, step: int = 1
) -> List['LineQid']

Returns a range of line qids for each entry in qid_shape with matching dimension.

Args
qid_shape	A sequence of dimensions for each LineQid to create.
start	The x coordinate of the first LineQid.
step	The amount to increment each x coordinate.

is_adjacent

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

Determines if two qubits are adjacent line qubits.

Args
other	cirq.Qid to test for adjacency.

Returns: True iff other and self are adjacent.

neighbors

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

Returns qubits that are potential neighbors to this LineQubit

Args
qids	optional Iterable of qubits to constrain neighbors to.

range

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@staticmethod
range(
    *range_args, dimension: int
) -> List['LineQid']

Returns a range of line qids.

Args
*range_args	Same arguments as python's built-in range method.
dimension	The dimension of the qid's Hilbert space, i.e. the number of quantum levels.

Returns
A list of line qids.

validate_dimension

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@staticmethod
validate_dimension(
    dimension: int
) -> None

Raises an exception if dimension is not positive.

Raises
ValueError	dimension is not positive.

with_dimension

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with_dimension(
    dimension: int
) -> 'LineQid'

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__

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

__eq__

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__eq__(
    other
) -> bool

Return self==value.

__ge__

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__ge__(
    other
) -> bool

Return self>=value.

__gt__

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__gt__(
    other
) -> bool

Return self>value.

__le__

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__le__(
    other
) -> bool

Return self<=value.

__lt__

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__lt__(
    other
) -> bool

Return self<value.

__ne__

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__ne__(
    other
) -> bool

Return self!=value.

__neg__

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__neg__() -> Self

__radd__

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__radd__(
    other: int
) -> Self

__rsub__

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__rsub__(
    other: int
) -> Self

__sub__

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