A programmable two-qubit solid-state quantum processor under ambient conditions

TL;DR

This paper demonstrates a programmable two-qubit quantum processor in a solid-state system operating under ambient conditions, capable of implementing complex algorithms with high success rates, advancing scalable quantum computing.

Contribution

It introduces a solid-state, ambient-condition programmable quantum processor with fifteen parameters for arbitrary unitary operations on two NV center spin-qubits, a significant step forward.

Findings

Successfully implemented Deutsch-Jozsa algorithm

Achieved over 80% success rate in Grover search

Demonstrated programmable control of two-qubit operations

Abstract

Quantum computers, which take advantage of the superposition and entanglement of physical states, could outperform their classical counterparts in solving problems with technological impact, such as factoring large numbers and searching databases. A quantum processor executes algorithms by applying a programmable sequence of gates to an initialized state of qubits, which coherently evolves into a final state containing the result of the computation. Although quantum processors with a few qubits have been demonstrated on multiple quantum computing platforms, realization of solid-state programmable quantum processor under ambient conditions remains elusive. Here we report a programable quantum processor that can be programmed with fifteen parameters to realize arbitrary unitary transformations on two spin-qubits in a nitrogen-vacancy (NV) center in diamond. We implemented the Deutsch-Jozsa and Grover search algorithms with average success rates above 80\%. This programmable two-qubit processor could form a core component of a large-scale quantum processor, and the methods used here are suitable for such a device.