Deterministic one-way logic gates on a cloud quantum computer

Abstract

One-way quantum computing is a promising candidate for fault-tolerant quantum computing. Here, we propose new protocols to realize a deterministic one-way CNOT gate and one-way Xrotations on quantum-computing platforms. By applying a delayed-choice scheme, we overcome a limit of most currently available quantum computers, which are unable to implement further operations on measured qubits or operations conditioned on measurement results from other qubits. Moreover, we decrease the error rate of the one-way logic gates, compared to the original protocol using local operations and classical communication (LOCC). In addition, we apply our deterministic one-way CNOT gate in the Deutsch-Jozsa algorithm to show the feasibility of our proposal. We demonstrate all these one-way gates and algorithms by running experiments on the cloud quantumcomputing platform IBM Quantum Experience.

Measurement-based interleaved randomised benchmarking using IBM processors

“…Hence, even though our adjustments have enabled us to obtain data for a proof-of-concept demonstration, dynamic circuit execution remains essential for the efficient scaling of our measurement-based interleaved randomised benchmarking protocol. Recent work on circumventing dynamic circuit execution on IBM processors for the measurementbased model via a delayed choice strategy [72] is an interesting direction, although such a strategy comes at the expense of adding further entangling gates, which may introduce additional noise. Dynamic circuit execution thus remains an important addition to IBM processors for the measurement-based model.…”