def spectroscopy(qubit,frequencies,data = None,ntimes = 20,amplitude = 0.1,variable = "p1x",measureAtReadout = False,delay = 0,f_sb = 0,measure20 = True):
if data == None:
data = Datacube()
if measureAtReadout:
data.setName("Spectroscopy at Readout - %s" % qubit.name())
else:
data.setName("Spectroscopy - %s" % qubit.name())
measureSpectroscopy(qubit = qubit,frequencies = frequencies,data = data,amplitude = amplitude,measureAtReadout = measureAtReadout,delay = delay,f_sb = f_sb)
(params,rsquare) = fitQubitFrequency(data,variable)
if measureAtReadout:
qubit.parameters()["frequencies.readout.f01"] = params[1]
else:
qubit.parameters()["frequencies.f01"] = params[1]
qubit.setDriveFrequency(params[1])
data.setName(data.name()+ " - f01 = %g GHz" % params[1])
if not measureAtReadout:
if measure20:
data02 = Datacube("Spectroscopy of (0->2)_2 transition")
data.addChild(data02)
frequencies02 = arange(params[1]-0.2,params[1]-0.05,0.001)
measureSpectroscopy(qubit = qubit,frequencies = frequencies02,data = data02,amplitude = amplitude*10.0,measureAtReadout = measureAtReadout,delay = delay,f_sb = f_sb)
(params02,rsquare02) = fitQubitFrequency(data02,variable)
qubit.parameters()["frequencies.f02"] = params02[1]*2.0
data.setName(data.name()+" - f02_2 = %g GHz" % params02[1])
data.savetxt()
return data
def spectroscopy(qubit,frequencies,data = None,ntimes = 20,amplitude = 0.1,variable = "p1x",measureAtReadout = False,delay = 0,f_sb = 0,measure20 = True,fitFrequency = True,factor20 = 10.0,delayAtReadout = 1500,saveData = True,pulseLength = 500,gaussian=True):
f_drive = qubit.driveFrequency()
try:
if data == None:
data = Datacube()
if measureAtReadout:
data.setName("Spectroscopy at Readout - %s" % qubit.name())
else:
data.setName("Spectroscopy - %s" % qubit.name())
data.parameters()["defaultPlot"]=[["f",variable]]
measureSpectroscopy(qubit = qubit,frequencies = frequencies,data = data,amplitude = amplitude,measureAtReadout = measureAtReadout,delay = delay,f_sb = f_sb,delayAtReadout = delayAtReadout,pulseLength = pulseLength,gaussian=gaussian)
if fitFrequency:
(params,rsquare) = fitQubitFrequency(data,variable)
if measureAtReadout:
varname01 = "frequencies.readout.f01"
else:
varname01 = "frequencies.f01"
if rsquare > 0.6:
print params[1]
qubit.parameters()[varname01] = params[1]
data.setName(data.name()+ " - f01 = %g GHz" % qubit.parameters()[varname01])
else:
print "No peak found..."
data.savetxt()
return data
if measure20:
data02 = Datacube("Spectroscopy of (0->2)_2 transition")
data.addChild(data02)
frequencies02 = arange(params[1]-0.18,params[1]-0.05,0.001)
data02.parameters()["defaultPlot"]=[["f",variable]]
measureSpectroscopy(qubit = qubit,frequencies = frequencies02,data = data02,amplitude = amplitude*factor20,measureAtReadout = measureAtReadout,delay = delay,f_sb = f_sb,delayAtReadout = delayAtReadout,pulseLength = pulseLength,gaussian=gaussian)
(params02,rsquare02) = fitQubitFrequency(data02,variable)
if rsquare02 > 0.5 and params[0] > 0.2:
if measureAtReadout:
varname02 = "frequencies.readout.f02"
varname12 = "frequencies.readout.f12"
else:
varname02 = "frequencies.f02"
varname12 = "frequencies.f12"
qubit.parameters()[varname02] = params02[1]*2.0
qubit.parameters()[varname12] = params02[1]*2.0-qubit.parameters()[varname01]
data.setName(data.name()+" - f02_2 = %g GHz" % (qubit.parameters()[varname02]/2))
if saveData:
data.savetxt()
return data
finally:
try:
qubit.setDriveFrequency(f_drive)
except:
pass
def T1(qubit,delays,data = None,averaging = 20,variable = "p1x"):
if data == None:
data = Datacube()
data.setName("T1 - " + qubit.name())
data.setParameters(instrumentManager.parameters())
try:
for delay in delays:
qubit.loadRabiPulse(phase = math.pi,readout = qubit.parameters()["timing.readout"],delay = delay)
acqiris.bifurcationMap(ntimes = averaging)
data.set(delay = delay)
data.set(**acqiris.Psw())
data.commit()
finally:
params = fitT1Parameters(data,variable)
data.setName(data.name()+" - T1 = %g ns " % params[2])
qubit.parameters()["relaxation.t1"] = params[2]
data.savetxt()
return data
def measureSpectroscopy(qubit,frequencies,data = None,ntimes = 20,amplitude = 0.1,variable = "p1x"):
if data == None:
data = Datacube()
data.setName("Spectroscopy - %s" % qubit.name())
qubit.loadRabiPulse(length = 500,readout = qubit.parameters()["timing.readout"],f_sb = 0)
qubit.turnOnDrive()
data.setParameters(instrumentManager.parameters())
try:
for f in frequencies:
qubit.setDriveFrequency(f)
qubit.setDriveAmplitude(I = amplitude,Q = amplitude)
acqiris.bifurcationMap(ntimes = ntimes)
data.set(f = f)
data.set(**acqiris.Psw())
data.commit()
finally:
(params,rsquare) = fitQubitFrequency(data,variable)
qubit.parameters()["frequencies.f01"] = params[1]
qubit.setDriveFrequency(params[1])
data.setName(data.name()+" - f01 = %g GHz" % params[1])
data.savetxt()
return spectroData
def T1precis(qubit,delays,data = None,averaging = 20,variable = "p1x"):
print "starting T1precis..."
if data == None:
data = Datacube()
data.setName("T1 - " + qubit.name())
data.setParameters(instrumentManager.parameters())
data.parameters()["defaultPlot"]=[["delay",variable]]
highTdelays=arange(2500,2600,5)
try:
for delay in highTdelays:
qubit.loadRabiPulse(phase = math.pi,readout = qubit.parameters()["timing.readout"],delay = delay)
acqiris.bifurcationMap(ntimes = averaging)
data.set(delay=delay)
data.set(**acqiris.Psw())
data.commit()
highTvalue=data.ColumnMean(variable)
highTValueFound=True
print "Long time ps=",highTvalue
except:
highTValueFound=False
raise
try:
for delay in delays:
qubit.loadRabiPulse(phase = math.pi,readout = qubit.parameters()["timing.readout"],delay = delay)
acqiris.bifurcationMap(ntimes = averaging)
data.set(delay=delay)
data.set(**acqiris.Psw())
data.commit()
finally:
if highTValueFound:
print "calling fitT1Parametersprecis"
params = fitT1Parametersprecis(data,variable,highTvalue)
else:
params = fitT1Parameters(data,variable)
data.setName(data.name()+" - T1 = %g ns " % params[1])
qubit.parameters()["relaxation.t1"] = params[1]
data.savetxt()
return data
def T1(qubit,delays,data = None,averaging = 20,variable = "p1x",gaussian = True,saveData = True,state=1):
if data == None:
data = Datacube()
data.setName("T1 - " + qubit.name()+" - state "+str(state))
data.setParameters(instrumentManager.parameters())
data.parameters()["defaultPlot"]=[["delay",variable]]
try:
for delay in delays:
if state==2:
loadPi012Pulse(qubit,delay=delay)
else:
qubit.loadRabiPulse(phase = math.pi,delay = delay,gaussian = gaussian)
acqiris.bifurcationMap(ntimes = averaging)
data.set(delay = delay)
data.set(**acqiris.Psw())
data.commit()
finally:
params = fitT1Parameters(data,variable)
data.setName(data.name()+" - T1 = %g ns " % params[2])
qubit.parameters()["relaxation.t1_%d" % state] = params[2]
if saveData:
data.savetxt()
return data
def sCurves(jba,qubit = None,variable = "p1x",data = None,ntimes = 20,s2=False,optimize = "v10",step = 0.01,measureErrors = False,saveData = True,voltageBounds = None,**kwargs):
"""
Measures the s curves of the JBA. Assumes that the qubit is alread preset to a pi-pulse.
"""
def getVoltageBounds(v0,jba,variable,ntimes):
v = v0
jba.setVoltage(v)
acqiris.bifurcationMap(ntimes = ntimes)
p = acqiris.Psw()[variable]
while p > 0.03 and v < v0*2.0:
v*=1.1
jba.setVoltage(v)
acqiris.bifurcationMap()
p = acqiris.Psw()[variable]
vmax = v
v = v0
jba.setVoltage(v)
acqiris.bifurcationMap(ntimes = ntimes)
p = acqiris.Psw()[variable]
while p < 0.98 and v > v0/2.0:
v/=1.1
jba.setVoltage(v)
acqiris.bifurcationMap()
p = acqiris.Psw()[variable]
vmin = v
return (vmin*0.95,vmax*1.1)
hasFinished = False
try:
data.setParameters(instrumentManager.parameters())
v0 = jba.voltage()
if data == None:
sData = Datacube()
else:
sData = data
if sData.name() == "datacube":
if not qubit == None:
sData.setName("S curves - %s" % qubit.name())
s0 = Datacube("S0")
s1 = Datacube("S1")
sData.addChild(s0)
sData.addChild(s1)
s0.parameters()["defaultPlot"]=[["v",variable]]
s1.parameters()["defaultPlot"]=[["v",variable]]
s1.parameters()["defaultPlot"].append(["v","contrast10"])
else:
sData.setName("S curve - %s" % jba.name())
sData.parameters()["defaultPlot"]=[["v",variable]]
error=False
if not qubit == None:
qubit.turnOnDrive()
qubit.loadRabiPulse(length = 0)
if voltageBounds == None:
(vmin,vmax) = getVoltageBounds(v0,jba,variable,ntimes)
else:
(vmin,vmax) = voltageBound
print vmin,vmax
if qubit == None:
measureSingleS(voltages = arange(vmin,vmax,step),data = sData,jba = jba,ntimes = ntimes)
return
else:
measureSingleS(voltages = arange(vmin,vmax,step),data = s0,jba = jba,ntimes = ntimes)
qubit.loadRabiPulse(phase = math.pi,**kwargs)
measureSingleS(voltages = arange(vmin,vmax,step),data = s1,jba = jba,ntimes = ntimes)
failed12 = False
if s2:
try:
s2 = Datacube("S2")
s2.parameters()["defaultPlot"]=[["v",variable]]
sData.addChild(s2)
loadPi012Pulse(qubit)
measureSingleS(voltages = arange(vmin,vmax,step),data = s2,jba = jba,ntimes = ntimes)
s1.createColumn("contrast20",s2.column(variable)-s0.column(variable))
s1.createColumn("contrast21",s2.column(variable)-s1.column(variable))
s1.parameters()["defaultPlot"].extend([["v","contrast20"],["v","contrast21"]])
qubit.parameters()["readout.v20"] = float(s1.column("v")[argmax(s1.column("contrast20"))])
qubit.parameters()["readout.v21"] = float(s1.column("v")[argmax(s1.column("contrast21"))])
qubit.parameters()["readout.contrast20"] = float(s1.column("contrast20")[argmax(s1.column("contrast20"))])
qubit.parameters()["readout.contrast21"] = float(s1.column("contrast21")[argmax(s1.column("contrast21"))])
data.setName(data.name()+" - v20 = %g" % qubit.parameters()["readout.contrast20"])
data.setName(data.name()+" - v21 = %g" % qubit.parameters()["readout.contrast21"])
except:
failed12 = True
raise
else:
failed12=True
s1.createColumn("contrast10",s1.column(variable)-s0.column(variable))
s1.parameters()["defaultPlot"].append(["v",variable])
qubit.parameters()["readout.v10"] = float(s1.column("v")[argmax(s1.column("contrast10"))])
qubit.parameters()["readout.contrast10"] = float(s1.column("contrast10")[argmax(s1.column("contrast10"))])
data.setName(data.name()+" - v10 = %g" % qubit.parameters()["readout.contrast10"])
if optimize == "v21" or optimize == 'v20':
qubit.parameters()["readout.use12"] = True
else:
qubit.parameters()["readout.use12"] = False
if optimize == "v20" and not failed12:
imax = argmax(s1.column("contrast20"))
v0 = s1.column("v")[imax]
elif optimize == "v21" and not failed12:
imax = argmax(s1.column("contrast21"))
v0 = s1.column("v")[imax]
else:
imax = argmax(s1.column("contrast10"))
v0 = s1.column("v")[imax]
hasFinished = True
return (sData,v0)
finally:
jba.setVoltage(v0)
if hasFinished:
if optimize == 'v20':
loadPi012Pulse(qubit)
else:
qubit.loadRabiPulse(phase = math.pi)
if measureErrors:
qubit.turnOnDrive()
qubit.loadRabiPulse(phase=0)
acqiris.bifurcationMap(ntimes = 1000)
qubit.parameters()["readout.p00"] = float(1.0-acqiris.Psw()[variable])
if optimize == 'v10':
qubit.loadRabiPulse(phase=math.pi)
else:
loadPi012Pulse(qubit)
acqiris.bifurcationMap(ntimes = 1000)
qubit.parameters()["readout.p11"] = float(acqiris.Psw()[variable])
if saveData:
data.savetxt()
qubit.loadWaveform(seq.getWaveform(endAt = qubit.parameters()["timing.readout"]),readout = qubit.parameters()["timing.readout"])
if callback != None:
callback(duration)
acqiris.bifurcationMap(ntimes = averaging)
data.set(duration = duration)
data.set(**acqiris.Psw())
data.commit()
except:
traceback.print_exc()
finally:
if amplitude != 0:
qubit.popState()
(params,rsquare) = fitRamseyFrequency(data,variable,f_offset=f_offset)
if rsquare > 0.5:
qubit.parameters()["pulses.ramsey.t_pi"] = params[1]/2.0
data.setName(data.name()+" - f_r = %g MHz - T_2 = %g ns" % ((1.0/params[1])*1000,params[2]))
data.parameters()["ramseyFit"] = params
f_correct = 1.0/params[1]-abs(f_offset)
if correctFrequency and amplitude == 0 and f_correct < 0.05:
print "Correcting qubit frequency by %g MHz" % (f_correct*1000)
if 01 == transition or 02 == transition:
qubit.parameters()["frequencies.f01"]-=f_correct
elif 12 == transition:
qubit.parameters()["frequencies.f12"]-=f_correct
else:
print "Ramsey fit is not good, resetting parameters..."
qubit.parameters()["pulses.ramsey.t_pi"] = None
if saveData:
data.savetxt()
return data
