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Fabio Sebastiano Interfacing qubits with classical (non-quantum) - - PowerPoint PPT Presentation
Fabio Sebastiano Interfacing qubits with classical (non-quantum) - - PowerPoint PPT Presentation
Fabio Sebastiano Interfacing qubits with classical (non-quantum) systems A real-life quantum computer Electronic interface Quantum processor Example Single-qubit rotation Microwave pulse I f ~ 5 GHz 20 GHz Example Read-out
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Example – Single-qubit rotation
f ~ 5 GHz – 20 GHz
I
Microwave pulse
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Example – Read-out
RQPC+ΔR ≈ 25 kΩ
50-Ω coax matching network
≈ 50 Ω RL = 50 Ω
fc = 200 MHz
LNA
Vout
Charge sensor
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A real-life quantum computer
Quantum processor Electronic interface
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A real-life quantum computer
Quantum processor Electronic interface
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A scalable quantum computer?
Quantum processor Quantum processor
T = 300 K T ≪ 1 K T = 4 K
Electronic interface bulky equipment
State of the art A scalable approach
Electronic interface tailor-made
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A scalable quantum computer!
T = 20 mK – 100 mK T = 1 K - 4 K T = 300 K DEMUX References ADC DAC DAC T sensor N-qubit Quantum Processor ADC Digital control MUX
Optical interface may also be required
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Challenges
- Performance
Constant voltages
- Stability < 1 μV
Microwave pulses
- Frequency > 12 GHz
- Resolution > 10 bit
- Timing accuracy < 100 ps
Read-out
- Noise < 100 pV/√Hz
- Kick-back < 100 μV
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Challenges
- Performance
- Power dissipation
~ 1 W @ 4 K < 1 mW @ 20 mK
300 K 50 K 4 K 20 mK Cooling power
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Challenges
- Performance
- Power dissipation
- Cryogenic technology
– Operate @ 4 K, 20 mK, … – Superconducting devices (RSFQ, RQL, SQUID, …) – Semiconductors @ low-temperature
Minimum temperature Si BJT 100 K Ge BJT 20 K SiGe HBT < 1 K GaAs MESFET 40 K CMOS 30 mK or below?
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A scalable quantum computer
T = 20 mK – 100 mK T = 1 K - 4 K T = 300 K References ADC DAC T sensor N-qubit Quantum Processor ADC Digital control MUX DEMUX DAC
Challenges
- Performance
- Power
- Cryogenic