Apparatus and method for quantum error correction without measurement or active feedback

An apparatus comprising:

• a quantum processor comprising a plurality of qubits;
• a quantum controller to autonomously execute a quantum error correction script to perform the operations of:
• determining an error syndrome on a first subset of ancilla qubits of a quantum processor;
• decoding the error syndrome to produce decoded results on a second subset of ancilla qubits of the quantum processor;
• applying the decoded results to one or more system qubits;
• and
• unconditionally resetting the first subset and/or second subset of ancilla qubits to remove entropy and/or noise from the quantum system,
• wherein the operations of determining the error syndrome, decoding the error syndrome, applying the decoding results, and unconditionally resetting the first and/or second subset of ancilla qubits are performed responsive to a qubit controller executing quantum control instructions provided from or derived from a script and without transmitting measurement data related to the error syndrome to a non-quantum computing device.

A machine-readable medium having program code stored thereon which, when executed by a qubit controller, causes the operations of:

• determining an error syndrome on a first subset of ancilla qubits of a quantum processor;
• decoding the error syndrome to produce decoded results on a second subset of ancilla qubits of the quantum processor;
• applying the decoded results to one or more system qubits;
• and
• unconditionally resetting the first subset and/or second subset of ancilla qubits to remove entropy and/or noise from the quantum system,
• wherein the operations of determining the error syndrome, decoding the error syndrome, applying the decoding results, and unconditionally resetting the first and/or second subset of ancilla qubits are performed responsive to a qubit controller executing quantum control instructions provided from or derived from a script and without transmitting measurement data related to the error syndrome to a non-quantum computing device.