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The QICK (Quantum Instrumentation Control Kit): Readout and control for qubits and detectors
L. Stefanazzi et al., arXiv:2110.00557v1 (2021)
Niyaz Beysengulov
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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)
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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)
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Digital demodulation and filtering
Y. Salathé et al., Physical Review Applied 9.3 (2018): 034011.
Heterodyne detection scheme (using FPGA)
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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)
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Digital demodulation and filtering
2. Digital mixing
sideband at zero frequency
Heterodyne detection scheme (using FPGA)
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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)
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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)
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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
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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
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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
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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
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QICK RF board Performance
Spectrum of mixer upconversion Latencies
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Characterization of a transmon qubit
https://github.com/openquantumhardware/qick