Method for maintaining phase coherence of rf pulses by monitoring and correction
AssigneeQ.M Technologies Ltd.
InventorsOded Wertheim, Yonatan Cohen, Yuval Toren
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Abstract
This disclosure provides a modular control system for quantum systems. The system comprises digital logic configured to generate digital waveform data for multiple channels, multi-channel digital-to-analog converters configured to generate analog outputs, analog front ends connected to the analog outputs, and synchronization circuitry configured to exchange synchronization signals with a peer device. The synchronization circuitry determines phase information according to the synchronization signals and applies phase correction via a baseband signal to a high frequency reference to maintain global timing alignment and phase alignment.
Claims26
A control system for generating phase-coherent radio-frequency control signals, comprising:
- one or more signal-generation modules each comprising a plurality of signal generation channels;
- digital logic configured to generate digital waveform data for the plurality of signal generation channels;
- one or more multi-channel digital-to-analog converters configured to convert the digital waveform data into a plurality of analog outputs;
- analog front-end circuitry coupled to the plurality of analog outputs;
- and
- synchronization circuitry configured to maintain phase coherence across at least a portion of the plurality of signal generation channels,
- wherein the synchronization circuitry is configured to:
- generate a local reference signal that is phase coherent with a high-speed signal;
- measure a phase difference between the synchronization reference signal and the local reference signal over time;
- compute a phase correction value based on the measured phase difference;
- and
- digitally apply the phase correction value to a signal generation path selected from a baseband phase rotator, a digital upconversion stage, a numerically controlled oscillator of a digital-to-analog converter, or digitally controlled delay circuitry,
- such that phase coherence is maintained despite phase drift occurring during operation.
A method of maintaining phase coherence among a plurality of radio-frequency signal generation channels, comprising:
- generating digital waveform data for the plurality of signal generation channels;
- converting the digital waveform data into analog signals using one or more multi-channel digital-to-analog converters;
- exchanging a synchronization reference signal with at least one peer device;
- generating a local reference signal phase coherent with a high-speed signal used for signal generation;
- repeatedly measuring a phase difference between the synchronization reference signal and the local reference signal during operation;
- computing a phase correction value based on the measured phase difference;
- and
- digitally applying the phase correction value to at least one of a baseband signal path, a digital upconversion stage, a numerically controlled oscillator of a digital-to-analog converter, or digitally controlled delay circuitry, thereby maintaining phase coherence over time in the presence of phase drift.
Dependencies are inferred from the claim text.