Quantum Computer Clusters for Large-Scale Applications

A quantum computer cluster comprising:

• a first quantum computer system comprising a first quantum processing unit housed in a first cryostat and comprising a first qubit device;
• a second quantum computer system comprising a second quantum processing unit housed in a second, distinct cryostat and comprising a second qubit device;
• and
• a global controller communicably coupled to the first and second quantum computer systems and configured to perform operations comprising:
• obtaining respective local frames from the first and second quantum computer systems;
• determining respective values of phase compensation for the first and second quantum computer systems based on the respective local frames;
• transmitting the respective values of the phase compensation to the first and second quantum computer systems;
• and
• causing the first and second quantum computer systems to apply phase shifts to phases of control signals communicated to at least one of the first and second qubit devices according to the respective values of the phase compensation received from the global controller.

A method for conditioning control signals from a local control system to a qubit device of a quantum processing unit in a quantum computer system, the method comprising:

• obtaining a digital pulse waveform;
• up-sampling the digital pulse waveform;
• pulse-shaping the up-sampled digital pulse waveform;
• converting the pulse-shaped digital pulse waveform to an analog pulse waveform;
• filtering the analog pulse waveform;
• and
• communicating the analog pulse waveform to the qubit device in the quantum processing unit of the quantum computer system.

A quantum computer system comprising:

• a quantum processing unit comprising qubit devices, and
• a local control system communicably coupled to the quantum processing unit, the control system comprising a control chip configured to perform operations comprising:
• obtaining a digital pulse waveform;
• up-sampling the digital pulse waveform;
• pulse-shaping the up-sampled digital pulse waveform;
• converting the pulse-shaped digital pulse waveform to an analog pulse waveform;
• filtering the analog pulse waveform;
• and
• communicating the analog pulse waveform to a qubit device of the quantum processing unit.