Abstract: A system for implementing a hybrid cryogenic electronic architecture is disclosed. The system comprises: a cryostat system operable to provide a first cryogenic temperature and a second cryogenic temperature; a quantum computing module comprising a plurality of quantum bit circuits capable of superconducting at the first cryogenic temperature; a CMOS circuitry module enclosed by the cryostat at the second cryogenic temperature and structured to support complementary metal-oxide-semiconductor (CMOS) circuits configured to interface with SFQ logic circuitry to allow control signals and quantum bit signals to be transferred therebetween; and an ambient temperature or room temperature (RT) control module operable to provide input signals to the CMOS circuitry module and to receive therefrom readout signals associated with quantum states of the plurality of quantum bit circuits.

Abstract: Quantum computing systems require methods to control energies of qubits and couplers for quantum operations. Flux biasing of qubits and quantum couplers is provided for a superconducting quantum computer using single-flux-quantum (SFQ) technology. This method is applicable to a wide range of superconducting qubit structures and couplers, including transmons, fluxoniums, flux qubits, phase qubits and other superconducting qubits. This method enables arbitrary-amplitude time-varying flux biasing of qubits and couplers, due to a sequence of high-speed SFQ pulses. Several preferred embodiments are disclosed which provide high-fidelity control of fast single-qubit and multi-qubit operations.

Abstract: This patent document is directed to implementations of embodiments of an error correction module or gadget using a cryogenic classical superconducting circuit that can be used as a decoder of quantum error correcting codes correcting errors in quantum computing.

Abstract: Quantum computing systems require methods to control energies of qubits and couplers for quantum operations. Flux biasing of qubits and quantum couplers is provided for a superconducting quantum computer using single-flux-quantum (SFQ) technology. This method is applicable to a wide range of superconducting qubit structures and couplers, including transmons, fluxoniums, flux qubits, phase qubits and other superconducting qubits. This method enables arbitrary-amplitude time-varying flux biasing of qubits and couplers, due to a sequence of high-speed SFQ pulses. Several preferred embodiments are disclosed which provide high-fidelity control of fast single-qubit and multi-qubit operations.

Abstract: Quantum computing systems require methods to control energies of qubits and couplers for quantum operations. Flux biasing of qubits and quantum couplers is provided for a superconducting quantum computer using single-flux-quantum (SFQ) technology. This method is applicable to a wide range of superconducting qubit structures and couplers, including transmons, fluxoniums, flux qubits, phase qubits and other superconducting qubits. This method enables arbitrary-amplitude time-varying flux biasing of qubits and couplers, due to a sequence of high-speed SFQ pulses. Several preferred embodiments are disclosed which provide high-fidelity control of fast single-qubit and multi-qubit operations.

Abstract: The technology disclosed in this patent document can be implemented to combine quantum computing, classical qubit control/readout, and classical digital computing in a scalable computing system based on superconducting qubits and special interconnection designs for connecting hardware components within a multi-stage cryogenic system to provide fast communications between the quantum computing module and its controller while allowing efficient management of wiring with other modules.