Qubit assembly having adjustable current operators

A method comprising:

• coupling a first superconducting loop, associated with a first qubit and having an associated first quantum operator, to a second superconducting loop, associated with a second qubit and having an associated second quantum operator;
• providing a first control flux to the first qubit to tune the first quantum operator to represent an axis of the Bloch sphere;
• and
• providing a second control flux to the second qubit to tune the second quantum operator to represent the axis of the Bloch sphere, such that the first qubit and the second qubit are coupled along the axis of the Bloch sphere associated with the first and second quantum operators.

A system comprising:

• a first qubit assembly comprising:
• a first superconducting loop comprising a first Josephson junction and a second Josephson junction;
• a second superconducting loop comprising the second Josephson junction and a third Josephson junction;
• a third superconducting loop comprising the third Josephson junction and a fourth Josephson junction;
• a first flux source configured to provide a first control flux to the second superconducting loop, such that the effective commutation relations between a first quantum operator corresponding to current in the first superconducting loop and a second quantum operator corresponding to current in the third superconducting loop can be changed by changing a magnitude of the first control flux provided to the second superconducting loop by the first flux source;
• a second qubit assembly comprising:
• a fourth superconducting loop comprising a fifth Josephson junction and a sixth Josephson junction;
• a fifth superconducting loop comprising the sixth Josephson junction and a seventh Josephson junction;
• a sixth superconducting loop comprising the seventh Josephson junction and a eighth Josephson junction;
• and
• a second flux source configured to provide a second control flux to the fifth superconducting loop, such that the effective commutation relations between a third quantum operator corresponding to current in one of the fourth superconducting loop and a fourth quantum operator corresponding to current in the sixth superconducting loop can be changed by changing a magnitude of the second control flux;
• and
• a coupling assembly configured to couple the third superconducting loop to the sixth superconducting loop.