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Patent US10560076
Issued 2020-02-11
Frequency Generation In A Quantum Controller
A quantum controller comprises quantum control pulse generation circuitry, signal generation circuitry, and phase parameter generation circuitry. The phase parameter generation circuitry is operable to determine, based on an output of the time-tracking circuitry, a first value of a phase parameter to be used for generation of an oscillating signal. The signal generation circuitry is operable to, at a first time instant, begin generation of the oscillating signal at a first frequency for modulation of a first of the two quantum control pulses, and, at a second time instant, generate the oscillating signal at a second frequency, wherein the phase of the oscillating signal at the second time instant is determined by the value of the phase parameter such that the phase of the oscillating signal is as it would have been if the oscillating signal had been oscillating at the second frequency continuously since a reference time.
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- 1. A system comprising:
a quantum controller comprising quantum control pulse generation circuitry, phase parameter generation circuitry, time-tracking circuitry, and signal generation circuitry, wherein:
the quantum control pulse generation circuitry is operable to generate a sequence of two quantum control pulses;
the phase parameter generation circuitry is operable to determine, based on an output of the time-tracking circuitry, a value of a phase parameter that corresponds to a phase of an oscillating signal relative to a reference time;
the signal generation circuitry is operable to:
at the reference time, begin generation of the oscillating signal at a first frequency for modulation of a first of the two quantum control pulses;
at a second time after the reference time, change the oscillating signal to a second frequency for modulation of the second quantum control pulse, wherein the phase of the oscillating signal at the second time is determined by the value of the phase parameter such that the phase of the oscillating signal is as it would have been if the oscillating signal had been oscillating at the second frequency continuously since the reference time.
- 16. A system comprising:
a quantum controller comprising quantum control pulse generation circuitry, phase parameter generation circuitry, time-tracking circuitry, and signal generation circuitry, wherein:
the quantum control pulse generation circuitry is operable to generate a sequence of two quantum control pulses;
the phase parameter generation circuitry is operable to determine, based on an output of the time-tracking circuitry, a value of a phase parameter that corresponds to a phase of an oscillating signal at a reference time;
the signal generation circuitry is operable to:
at the reference time, begin generation of the oscillating signal at a first frequency for modulation of a first of the two quantum control pulses;
at a second time after the reference time, cease generation of the oscillating signal at the first frequency and begin generation of the oscillating signal at a second frequency; and
at a third time after the second time, resume generation of the oscillating signal at the first frequency for modulation of the second quantum control pulse, wherein the phase of the oscillating signal at the third time is determined by the value of the phase parameter such that the phase of the oscillating signal is as it would have been if the oscillating signal had been generated continuously since the reference time.
