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transmon_pocket_6_qubit.py
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transmon_pocket_6_qubit.py
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from collections import OrderedDict
from ..qubit_base import QubitBase
from qiskit_metal.designs import DesignPlanar
from qiskit_metal.qlibrary.qubits.transmon_pocket_6 import TransmonPocket6
import numpy as np
class TransmonPocket6Qubit(QubitBase):
def __init__(
self, design: DesignPlanar = None, qubit_grid: np.ndarray = np.array([])
):
self._design = design
self._qubit_grid = qubit_grid
def generate_qubit_layout(self):
self._pins_to_remove = self._get_open_qubit_pins(self._qubit_grid)
self.qubits = self._generate_qubits(self._design, self._qubit_grid, self._pins_to_remove)
return self.qubits
def _generate_qubits(self, design: DesignPlanar, qubit_grid: np.ndarray, pins_to_remove: dict[int,dict[str,list[str]]]):
"""Generate layout of qubits in the chip
Returns:
dict[str, TransmonPocket]: dict of qubit objects
"""
N_x = len(qubit_grid[0])
N_y = len(qubit_grid)
qubits = {}
#Loop to generate and draw the qubits
for x in range(N_x):
for y in range(N_y):
current_qubit = qubit_grid[y][x]
# No qubit in grid
if current_qubit == -1:
continue
qubit_name = f'Q_{current_qubit}'
connection_pads = dict(
B0 = dict(loc_W=-1, loc_H=-1, pad_width='75um'),
B1 = dict(loc_W=-1, loc_H=+1, pad_width='120um'),
B2 = dict(loc_W=+1, loc_H=-1, pad_width='120um'),
B3 = dict(loc_W = +1, loc_H = +1, pad_width='90um'),
)
if pins_to_remove is not None:
# TODO: Creating a dictionary seems unnecessary
exclude_pin_dict = {pin: dict() for pin in pins_to_remove[current_qubit]["remove"]}
connection_pins = set(connection_pads) - set(exclude_pin_dict.keys())
connection_pads_intersected = {key: connection_pads[key] for key in connection_pins}
else:
connection_pads_intersected = connection_pads
#TODO: What should be the correct spacing between qubits
options = dict(pos_x= str(x*3500)+'um', pos_y = str(y*3000)+'um', orientation = "-90",
connection_pads=connection_pads_intersected)
if y != 0 and y != (N_y-1):
options["connection_pads"]["B4"] = dict(loc_W=0, loc_H=-1, pad_width='90um')
obj=TransmonPocket6(design,qubit_name,options)
qubits[qubit_name] = obj
return qubits
def _get_open_qubit_pins(self, qubit_grid: np.ndarray[int]) -> dict[int,list[str]]:
pins_to_remove = OrderedDict()
N_x = len(qubit_grid[0])
N_y = len(qubit_grid)
#Loop to generate and draw the launchpads
for x in range(N_x):
for y in range(N_y):
current_qubit = qubit_grid[y][x]
if current_qubit == -1:
continue
surrounding_qubits = {
"left": self._get_qubit(qubit_grid, y, x-1),
"right": self._get_qubit(qubit_grid, y, x+1),
"top": self._get_qubit(qubit_grid, y+1, x),
"bottom": self._get_qubit(qubit_grid, y-1, x),
}
pins_to_remove[current_qubit] = {
"surrounding_qubits": surrounding_qubits,
"remove": [],
}
# Bottom row
if y == 0:
if x%2 == 0:
if surrounding_qubits["left"] == -1:
pins_to_remove[current_qubit]["remove"].append("B2")
if surrounding_qubits["right"] == -1:
pins_to_remove[current_qubit]["remove"].append("B1")
if surrounding_qubits["top"] == -1:
pins_to_remove[current_qubit]["remove"].append("B0")
else:
if surrounding_qubits["left"] == -1:
pins_to_remove[current_qubit]["remove"].append("B0")
if surrounding_qubits["right"] == -1:
pins_to_remove[current_qubit]["remove"].append("B3")
if surrounding_qubits["top"] == -1:
pins_to_remove[current_qubit]["remove"].append("B1")
# Top row
elif y == (N_y - 1):
if x%2 == 0:
if surrounding_qubits["left"] == -1:
pins_to_remove[current_qubit]["remove"].append("B2")
if surrounding_qubits["right"] == -1:
pins_to_remove[current_qubit]["remove"].append("B1")
if surrounding_qubits["bottom"] == -1:
pins_to_remove[current_qubit]["remove"].append("B3")
else:
if surrounding_qubits["left"] == -1:
pins_to_remove[current_qubit]["remove"].append("B0")
if surrounding_qubits["right"] == -1:
pins_to_remove[current_qubit]["remove"].append("B3")
if surrounding_qubits["bottom"] == -1:
pins_to_remove[current_qubit]["remove"].append("B2")
# Middle row
else:
if x%2 == 0:
if (y-1)%2 == 0:
if surrounding_qubits["left"] == -1:
pins_to_remove[current_qubit]["remove"].append("B0")
if surrounding_qubits["right"] == -1:
pins_to_remove[current_qubit]["remove"].append("B3")
if surrounding_qubits["bottom"] == -1:
pins_to_remove[current_qubit]["remove"].append("B2")
if surrounding_qubits["top"] == -1:
pins_to_remove[current_qubit]["remove"].append("B1")
else:
if surrounding_qubits["left"] == -1:
pins_to_remove[current_qubit]["remove"].append("B2")
if surrounding_qubits["right"] == -1:
pins_to_remove[current_qubit]["remove"].append("B1")
if surrounding_qubits["bottom"] == -1:
pins_to_remove[current_qubit]["remove"].append("B3")
if surrounding_qubits["top"] == -1:
pins_to_remove[current_qubit]["remove"].append("B0")
else:
if (y-1)%2 == 0:
if surrounding_qubits["left"] == -1:
pins_to_remove[current_qubit]["remove"].append("B2")
if surrounding_qubits["right"] == -1:
pins_to_remove[current_qubit]["remove"].append("B1")
if surrounding_qubits["bottom"] == -1:
pins_to_remove[current_qubit]["remove"].append("B3")
if surrounding_qubits["top"] == -1:
pins_to_remove[current_qubit]["remove"].append("B0")
else:
if surrounding_qubits["left"] == -1:
pins_to_remove[current_qubit]["remove"].append("B0")
if surrounding_qubits["right"] == -1:
pins_to_remove[current_qubit]["remove"].append("B3")
if surrounding_qubits["bottom"] == -1:
pins_to_remove[current_qubit]["remove"].append("B2")
if surrounding_qubits["top"] == -1:
pins_to_remove[current_qubit]["remove"].append("B1")
return pins_to_remove
def _get_qubit(self, qubit_grid: np.array, row: int, col: int, default_value: int = -1) -> int:
if row < 0 or row >= qubit_grid.shape[0] or col < 0 or col >= qubit_grid.shape[1]:
value = default_value
else:
value = qubit_grid[row, col]
return value