Integrated Programmable Controlled Phase Gate Design for Quantum Information Processing

TL;DR

This paper introduces an integrated programmable controlled-phase gate for quantum computing, allowing adjustable phase shifts post-fabrication, enhancing versatility in optical quantum circuits.

Contribution

The paper presents a novel integrated programmable controlled-phase gate that enables arbitrary phase adjustments after fabrication, unlike traditional fixed-phase gates.

Findings

Enables post-fabrication phase tuning

Improves versatility of optical quantum circuits

Facilitates new quantum information processing applications

Abstract

In this paper, we proposed a design of integrated programmable controlled-phase (CPHASE) gate to be used in quantum information processing applications. This gate is capable of introducing arbitrary phase difference to target qubit in the case of control qubit being in the state of |1>. Because the desired phase difference is possible to be utilized after fabrication unlike the conventional controlled-phase gates which provide hard-coded phase shift, such an integrated gate is expected to pave the way for more versatile operations of current integrated optical circuits as well as possible new applications.