the qick (quantum instrumentation control kit): readout
TRANSCRIPT
The QICK (Quantum Instrumentation Control Kit): Readout and control for qubits and detectors
L. Stefanazzi et al., arXiv:2110.00557v1 (2021)
Niyaz Beysengulov
Qubit measurements in circuit QED
Transmon qubit coupled to a 1D transmission-line resonator
QND measurement
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HBMi = d ·E+�p
dipole moment of the transmon
resonator’s zero-point electric field
d
dispersive regime:
Jaynes-Cummings Hamiltonian:
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�e,g = ±�`+i�M⇣2�
⌘
A. Blais et al., Review of Modern Physics 93 (2021)
Qubit measurements in circuit QED
The microwave measurement chain
Signal at the output of cavity (including all amplifier chain):
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�e,g = ±�`+i�M⇣2�
⌘
Local Oscillator:
IQ mixer output:
homodyne detection
heterodyne detection
I
QA. Blais et al., Review of Modern Physics 93 (2021)
Digital demodulation and filtering
Y. Salathé et al., Physical Review Applied 9.3 (2018): 034011.
Heterodyne detection scheme (using FPGA)
Digital demodulation and filtering
Voltage signal at the ADC input:
ADC sample rate:
IF frequency:
ADC resolution:±1 V range and 14 bit: discretisation step 2-13 V ≈ 0.12 mV
1. Digitisation
Y. Salathé et al., Physical Review Applied 9.3 (2018): 034011.
Heterodyne detection scheme (using FPGA)
Digital demodulation and filtering
2. Digital mixing
sideband at zero frequency
Heterodyne detection scheme (using FPGA)
Digital demodulation and filtering
3. Digital low-pass filter
moving average
4. State discrimination
Y. Salathé et al., Physical Review Applied 9.3 (2018): 034011.
Heterodyne detection scheme (using FPGA)
Quantum Instrumentation Control Kit
New FPGA platform
• high speed DAC • high speed ADC • programmable FPGA logic • conventional microprocessor
L Stefanazzi et al., arXiv:2110.00557v1 (2021)
Quantum Instrumentation Control Kit
MotherboardXilinx ZCU111 RFSoC evaluation board
• eight 6.5 Gs/s DACs • eight 4 GS/s ADCs
XCZU28DR RFSoC chip
Includes: - configurable IQ digital up/down conversion - integrated num.controlled oscillator - gain matrix - digital filters
direct synthesize carrier frequencies up to 3 GHz in first Nyquist zone and up to 6 GHZ in the second Nyquist zone mode
Quantum Instrumentation Control Kit
Analog front-endQICK RF board
More than 200 components: amplifiers, mixers, filters, local oscillator generators, switches, drivers
Eight RF or DC coupled outputs
Quantum Instrumentation Control Kit
Analog front-endQICK RF board
More than 200 components: amplifiers, mixers, filters, local oscillator generators, switches, drivers
Eight RF or DC (1.5 GHz bandwidth) coupled inputs
System architecture and functionality
QICK firmware block diagram
tProcessor custom processor
with timed instructions
Processing System Programmable Logic
Signal generators pulses with complex envelopes
which modulates a high-speed carrier
ZYNQ system system with own DDR4 memory,
running LINUX OS on a multi-core ARM processor
Readout block fast digital downconversion
QICK RF board Performance
Spectrum of mixer upconversion Latencies
Characterization of a transmon qubit
https://github.com/openquantumhardware/qick