def phasegate(theta):
"""
Returns quantum object representing the phase shift gate.
Parameters
----------
theta : float
Phase rotation angle.
Returns
-------
phase_gate : qobj
Quantum object representation of phase shift gate.
Examples
--------
>>> phasegate(pi/4)
Quantum object: dims = [[2], [2]], shape = [2, 2], type = oper, isHerm = False
Qobj data =
[[ 1.00000000+0.j 0.00000000+0.j ]
[ 0.00000000+0.j 0.70710678+0.70710678j]]
"""
u = qstate('u')
d = qstate('d')
Q = d * d.dag() + (exp(1.0j * theta) * u * u.dag())
return Qobj(Q)
def cnot():
"""
Quantum object representing the CNOT gate.
Returns
-------
cnot_gate : qobj
Quantum object representation of CNOT gate
Examples
--------
>>> cnot()
Quantum object: dims = [[2, 2], [2, 2]], shape = [4, 4], type = oper, isHerm = True
Qobj data =
[[ 1.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 1.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 1.+0.j]
[ 0.+0.j 0.+0.j 1.+0.j 0.+0.j]]
"""
uu = qstate('uu')
ud = qstate('ud')
du = qstate('du')
dd = qstate('dd')
Q = dd * dd.dag() + du * du.dag() + uu * ud.dag() + ud * uu.dag()
return Qobj(Q)
def cnot():
"""
Quantum object representing the CNOT gate.
Returns
-------
cnot_gate : qobj
Quantum object representation of CNOT gate
Examples
--------
>>> cnot()
Quantum object: dims = [[2, 2], [2, 2]], shape = [4, 4], type = oper, isHerm = True
Qobj data =
[[ 1.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 1.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 1.+0.j]
[ 0.+0.j 0.+0.j 1.+0.j 0.+0.j]]
"""
uu=qstate('uu')
ud=qstate('ud')
du=qstate('du')
dd=qstate('dd')
Q=dd*dd.dag()+du*du.dag()+uu*ud.dag()+ud*uu.dag()
return Qobj(Q)
def phasegate(theta):
"""
Returns quantum object representing the phase shift gate.
Parameters
----------
theta : float
Phase rotation angle.
Returns
-------
phase_gate : qobj
Quantum object representation of phase shift gate.
Examples
--------
>>> phasegate(pi/4)
Quantum object: dims = [[2], [2]], shape = [2, 2], type = oper, isHerm = False
Qobj data =
[[ 1.00000000+0.j 0.00000000+0.j ]
[ 0.00000000+0.j 0.70710678+0.70710678j]]
"""
u=qstate('u')
d=qstate('d')
Q=d*d.dag()+(exp(1.0j*theta)*u*u.dag())
return Qobj(Q)
def fredkin():
"""Quantum object representing the Fredkin gate.
Returns
-------
fred_gate : qobj
Quantum object representation of Fredkin gate.
Examples
--------
>>> fredkin()
Quantum object: dims = [[2, 2, 2], [2, 2, 2]], shape = [8, 8], type = oper, isHerm = True
Qobj data =
[[ 1.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 1.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 1.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 1.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 0.+0.j 1.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 1.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 1.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 1.+0.j]]
"""
uuu = qstate('uuu')
uud = qstate('uud')
udu = qstate('udu')
udd = qstate('udd')
duu = qstate('duu')
dud = qstate('dud')
ddu = qstate('ddu')
ddd = qstate('ddd')
Q = ddd * dag(ddd) + ddu * dag(ddu) + dud * dag(dud) + duu * dag(
duu) + udd * dag(udd) + uud * dag(udu) + udu * dag(uud) + uuu * dag(
uuu)
return Qobj(Q)
def toffoli():
"""Quantum object representing the Toffoli gate.
Returns
-------
toff_gate : qobj
Quantum object representation of Toffoli gate.
Examples
--------
>>> toffoli()
Quantum object: dims = [[2, 2, 2], [2, 2, 2]], shape = [8, 8], type = oper, isHerm = True
Qobj data =
[[ 1.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 1.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 1.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 1.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 0.+0.j 1.+0.j 0.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 1.+0.j 0.+0.j 0.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 1.+0.j]
[ 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j 1.+0.j 0.+0.j]]
"""
uuu = qstate('uuu')
uud = qstate('uud')
udu = qstate('udu')
udd = qstate('udd')
duu = qstate('duu')
dud = qstate('dud')
ddu = qstate('ddu')
ddd = qstate('ddd')
Q = ddd*dag(ddd) + ddu*dag(ddu) + dud*dag(dud) + duu*dag(duu) + udd*dag(udd) + udu*dag(udu) + uuu*dag(uud) + uud*dag(uuu)
return Qobj(Q)
def snot():
"""Quantum object representing the SNOT (Hadamard) gate.
Returns
-------
snot_gate : qobj
Quantum object representation of SNOT (Hadamard) gate.
Examples
--------
>>> snot()
Quantum object: dims = [[2], [2]], shape = [2, 2], type = oper, isHerm = True
Qobj data =
[[ 0.70710678+0.j 0.70710678+0.j]
[ 0.70710678+0.j -0.70710678+0.j]]
"""
u=qstate('u')
d=qstate('d')
Q=1.0/sqrt(2.0)*(d*d.dag()+u*d.dag()+d*u.dag()-u*u.dag())
return Qobj(Q)
def snot():
"""Quantum object representing the SNOT (Hadamard) gate.
Returns
-------
snot_gate : qobj
Quantum object representation of SNOT (Hadamard) gate.
Examples
--------
>>> snot()
Quantum object: dims = [[2], [2]], shape = [2, 2], type = oper, isHerm = True
Qobj data =
[[ 0.70710678+0.j 0.70710678+0.j]
[ 0.70710678+0.j -0.70710678+0.j]]
"""
u = qstate('u')
d = qstate('d')
Q = 1.0 / sqrt(2.0) * (d * d.dag() + u * d.dag() + d * u.dag() -
u * u.dag())
return Qobj(Q)
