A Quantum Gate Architecture via Teleportation and Entanglement I: Native Implementation of Many-Qubit Operations

In this talk we present QGATE, our Quantum Gate Architecture implemented via Teleportation and Entanglement. QGATE combines the measurement-driven aspect of measurement-based quantum computing with the dynamic entanglement generation of the circuit model. Building on the methods of ancilla-based quantum computing, QGATE enables many-qubit Hamiltonian evolutions to be performed without expansion into a finite universal gate set. Using QGATE the state of a register of logical qubits is evolved according to an arbitrary Hamiltonian via three primitives: Clifford operations, ancilla qubits, and arbitrary-angle single-qubit measurements. A logical operation proceeds by first performing a series of entangling Pauli operations, entangling a sub-set of logical register with a mutual QGATE ancilla. This QGATE ancilla is then measured, either in the computational basis after its state is evolved by a Pauli X-rotation or equivalently in a basis defined by a Pauli X-rotation of the computational basis, removing it from the state. A measurement induced back-action ensures the desired unitary operation is applied to the logical qubits up to a known by-product operator. As such QGATE performs logical evolutions without applying non-Clifford gates directly to the logical qubits of the system.