研究目的
To develop an optoelectronic pulse drive system for driving a Josephson junction array (JJA) to synthesize quantum-accurate voltage waveforms.
研究成果
An optoelectronic pulse drive system has been developed to drive a JJA, successfully demonstrating the synthesis of a unipolar 3.1 kHz sine wave. Future work includes testing with improved delta sigma codes, a lower noise digitizer, and distributed JJAs with a single ended output voltage.
研究不足
The preliminary results show that the largest harmonic is -55 dBc, the cause of which is under investigation. The system currently produces unipolar voltage waveforms only.
1：Experimental Design and Method Selection:
The system utilizes an FPGA for pattern generation and is compatible with delta sigma circuity under development. Commercial telecoms equipment is used to convert electrical pulses into optical pulses.
2：Sample Selection and Data Sources:
A lumped SNS JJA with 1024 junctions was used for preliminary tests.
3：List of Experimental Equipment and Materials:
FPGA, PPG, MZM, EDFA, InGaAs photodiode, JJA, high impedance preamplifier, laboratory oscilloscope.
4：Experimental Procedures and Operational Workflow:
The system was tested with a digital code for a simple second-order single-bit delta-sigma encoded sine wave. The optical pulse height was adjusted for operation at the center of the first Shapiro step.
5：Data Analysis Methods:
The output voltage was sampled at 500 MSa/s with a 10 bit laboratory oscilloscope.
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FPGA
Pattern generation for the optoelectronic pulse drive system.
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PPG
Pulse pattern generation for testing the optoelectronics.
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MZM
Conversion of electrical pulses into optical pulses.
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EDFA
Amplification of the optical signal.
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InGaAs photodiode
Conversion of optical pulses back into electrical pulses to drive the JJA.
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JJA
lumped SNS
Synthesis of quantum-accurate voltage waveforms.
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high impedance preamplifier
Amplification of the output voltage from the JJA.
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laboratory oscilloscope
10 bit
Sampling and analysis of the output voltage.
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