IMPROVED ERROR DETECTION MECHANISM FOR QUANTUM BITS
A feedback controller is provided to generate a quantum feedback operation to control one or more ancilla qubits in a quantum error correcting code. The quantum feedback operation is based on the measurement of the one or more ancilla qubits. The feedback controller is operable to dynamically adjust a state discrimination according to previous measurements of the one or more ancilla qubits.
1 - 40 . (canceled)
41 . A system, comprising:
a controller configured to generate a quantum feedback operation according to one or more ancilla qubits in a quantum error correcting code, wherein the quantum feedback operation is configured to increase a likelihood that the one or more ancilla qubits will subsequently be measured in a predetermined state.
42 . The system of claim 41 , wherein:
the controller is configured to generate an error detection event according to measurements of the one or more ancilla qubits.
43 . The system of claim 41 , wherein:
the quantum feedback operation is determined according to a state discrimination protocol.
44 . The system of claim 43 , wherein:
the controller is configured to dynamically adjust the discrimination protocol according to previous measurements of the one or more ancilla qubits.
45 . The system of claim 41 , wherein:
the quantum feedback operation is determined according to a state discrimination parameter.
46 . The system of claim 45 , wherein:
the state discrimination parameter is a state discrimination threshold.
47 . The system of claim 45 , wherein:
the controller is configured to dynamically adjust the state discrimination parameter according to previous measurements of the one or more ancilla qubits.
48 . The system of claim 41 , wherein:
the controller is configured to adjust, in real-time, a state discrimination according to the one or more ancilla qubits.
49 . The system of claim 41 , wherein:
the quantum feedback operation is configured to decrease a likelihood that measurements of the one or more ancilla qubits will decay.
50 . The system of claim 41 , wherein:
the quantum feedback operation is a conditioned operation, and
the controller is configured to generate a non-conditional quantum operation.
51 . A method, comprising:
via a quantum controller:
measuring one or more ancilla qubits in a quantum error correcting code;
generating a quantum feedback operation according to the one or more ancilla qubits, wherein the quantum feedback operation is configured to increase a likelihood that the one or more ancilla qubits will subsequently be measured in a predetermined state;
applying the quantum feedback operation; and
subsequently measuring the one or more ancilla qubits.
52 . The method of claim 51 , wherein the method comprises:
generating an error detection event according to measurements of the one or more ancilla qubits.
53 . The method of claim 51 , wherein the method comprises:
determining the quantum feedback operation according to a state discrimination protocol.
54 . The method of claim 53 , wherein the method comprises:
dynamically adjusting the discrimination protocol according to previous measurements of the one or more ancilla qubits.
55 . The method of claim 51 , wherein the method comprises:
determining the quantum feedback operation according to a state discrimination parameter.
56 . The method of claim 55 , wherein:
the state discrimination parameter is a state discrimination threshold.
57 . The method of claim 55 , wherein the method comprises:
dynamically adjusting the state discrimination parameter according to previous measurements of the one or more ancilla qubits.
58 . The method of claim 51 , wherein the method comprises:
dynamically adjusting a state discrimination according to previous measurements of the one or more ancilla qubits.
59 . The method of claim 51 , wherein:
the quantum feedback operation is configured to decrease a likelihood that measurements of the one or more ancilla qubits will decay.
60 . The method of claim 51 , wherein the method comprises:
generating a non-conditional quantum operation.