channels
This module defines Pulse Channels. Channels include:
- transmit channels, which should subclass
PulseChannel
- receive channels, such as
AcquireChannel
- non-signal “channels” such as
SnapshotChannel
,MemorySlot
andRegisterChannel
.
Novel channel types can often utilize the ControlChannel
, but if this is not sufficient, new channel types can be created. Then, they must be supported in the PulseQobj schema and the assembler.
Classes
AcquireChannel (index) | Acquire channels are used to collect data. |
Channel (index) | Base class of channels. |
ControlChannel (index) | Control channels provide supplementary control over the qubit to the drive channel. |
DriveChannel (index) | Drive channels transmit signals to qubits which enact gate operations. |
MeasureChannel (index) | Measure channels transmit measurement stimulus pulses for readout. |
MemorySlot (index) | Memory slot channels represent classical memory storage. |
PulseChannel (index) | Base class of transmit Channels. |
RegisterSlot (index) | Classical resister slot channels represent classical registers (low-latency classical memory). |
SnapshotChannel () | Snapshot channels are used to specify commands for simulators. |
AcquireChannel(index)
GitHub(opens in a new tab)
Acquire channels are used to collect data.
Channel class.
Parameters
index (int
) – Index of channel.
Raises
PulseError – If index
is not a nonnegative integer.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str
Channel(index)
GitHub(opens in a new tab)
Base class of channels. Channels provide a Qiskit-side label for typical quantum control hardware signal channels. The final label -> physical channel mapping is the responsibility of the hardware backend. For instance, DriveChannel(0)
holds instructions which the backend should map to the signal line driving gate operations on the qubit labeled (indexed) 0.
Channel class.
Parameters
index (int
) – Index of channel.
Raises
PulseError – If index
is not a nonnegative integer.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str
prefix
= None
A shorthand string prefix for characterizing the channel type.
ControlChannel(index)
GitHub(opens in a new tab)
Control channels provide supplementary control over the qubit to the drive channel. These are often associated with multi-qubit gate operations. They may not map trivially to a particular qubit index.
Channel class.
Parameters
index (int
) – Index of channel.
Raises
PulseError – If index
is not a nonnegative integer.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str
DriveChannel(index)
GitHub(opens in a new tab)
Drive channels transmit signals to qubits which enact gate operations.
Channel class.
Parameters
index (int
) – Index of channel.
Raises
PulseError – If index
is not a nonnegative integer.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str
MeasureChannel(index)
GitHub(opens in a new tab)
Measure channels transmit measurement stimulus pulses for readout.
Channel class.
Parameters
index (int
) – Index of channel.
Raises
PulseError – If index
is not a nonnegative integer.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str
MemorySlot(index)
GitHub(opens in a new tab)
Memory slot channels represent classical memory storage.
Channel class.
Parameters
index (int
) – Index of channel.
Raises
PulseError – If index
is not a nonnegative integer.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str
PulseChannel(index)
GitHub(opens in a new tab)
Base class of transmit Channels. Pulses can be played on these channels.
Channel class.
Parameters
index (int
) – Index of channel.
Raises
PulseError – If index
is not a nonnegative integer.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str
RegisterSlot(index)
GitHub(opens in a new tab)
Classical resister slot channels represent classical registers (low-latency classical memory).
Channel class.
Parameters
index (int
) – Index of channel.
Raises
PulseError – If index
is not a nonnegative integer.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str
SnapshotChannel
GitHub(opens in a new tab)
Snapshot channels are used to specify commands for simulators.
Create new snapshot channel.
int
Return the index of this channel. The index is a label for a control signal line typically mapped trivially to a qubit index. For instance, DriveChannel(0)
labels the signal line driving the qubit labeled with index 0.
Return type
int
str
Return the shorthand alias for this channel, which is based on its type and index.
Return type
str