Joint logical measurements on diagonal patches of surface code
AssigneeMicrosoft Technology Licensing, LLC
InventorsJeongwan HAAH, Michael BEVERLAND, Nicolas Guillaume DELFOSSE
Life of this patent
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Abstract
A quantum computing system implementing surface code in a measurement circuit may be configured to translate a quantum algorithm including at least one Hadamard gate into an equivalent circuit that lacks a Hadamard gate, the circuit including Hadamard-conjugated Pauli measurements that include joint logical measurements implemented on diagonally-arranged patches of the surface code.
Claims20
A method comprising:
- translating a circuit with at least one Hadamard gate into an equivalent circuit that lacks a Hadamard gate;
- and
- implementing the equivalent circuit by performing a set of measurements that includes a joint logical measurement on two diagonally-arranged logical patches of surface code implemented in a quantum measurement circuit, the joint logical measurement including a sequence of operations comprising:
- expanding a first logical patch of the diagonally-arranged logical patches in a first direction to include a portion of an adjacent ancilla patch that is aligned in a second direction with a second logical patch of the diagonally-arranged logical patches, the first direction being perpendicular to the second direction;
- and
- shifting a position of the second logical patch toward the first logical patch.
(canceled)
A quantum system comprising:
- a classical controller configured to translate a Hadamard operation within a quantum algorithm into executable instructions for performing one or more Pauli measurements, the one or more Pauli measurements including a joint logical measurement on two diagonally-arranged logical patches of surface code;
- and
- a quantum measurement circuit that implements the surface code and that is controlled by the classical controller to perform the joint logical measurement on the two diagonally-arranged logical patches of surface code, the performance of the joint logical measurement including:
- expanding a first logical patch of the diagonally-arranged logical patches in a first direction to include a portion of an adjacent ancilla patch that is aligned in a second direction with a second logical patch of the diagonally-arranged logical patches, the first direction being perpendicular to the second direction;
- and
- shifting a position of the second logical patch toward the first logical patch.
(canceled)
One or more computer-readable storage media encoding computer executable instructions for executing a computer process comprising:
- translating a circuit with at least one Hadamard gate into an equivalent circuit that lacks a Hadamard gate;
- and
- implementing the equivalent circuit by performing a set of measurements that includes a joint logical measurement on two diagonally-arranged logical patches of surface code implemented in a quantum measurement circuit, the joint logical measurement being either a logical ZX measurement or a logical XZ measurement and being implemented by operations including:
- expanding a first logical patch of the diagonally-arranged logical patches in a first direction to include a portion of an adjacent ancilla patch that is aligned in a second direction with a second logical patch of the diagonally-arranged logical patches, the first direction being perpendicular to the second direction;
- shifting the second logical patch toward an original position of the first logical patch;
- measuring one or more stabilizers in a boundary row between the first logical patch and the second logical patch;
- and
- computing a product of the measured stabilizers.
(canceled)
Dependencies are inferred from the claim text.