Demonstration of a Controlled-Phase Gate for Continuous-Variable One-Way Quantum Computation

TL;DR

This paper experimentally demonstrates a measurement-based controlled-phase gate for continuous-variable quantum states, enabling universal Gaussian operations in one-way quantum computation with optical modes.

Contribution

It introduces a fully measurement-based controlled-phase gate for continuous variables using a four-mode Gaussian cluster state, advancing optical quantum computing capabilities.

Findings

Successfully implemented a controlled-phase gate via teleportation in a Gaussian cluster state.

Verified the quantum entanglement at the output with coherent input states.

Showed the gate's integration with single-mode operations for universal Gaussian processing.

Abstract

We experimentally demonstrate a controlled-phase gate for continuous variables in a fully measurement-based fashion. In our scheme, the two independent input states of the gate, encoded in two optical modes, are teleported into a four-mode Gaussian cluster state. As a result, one of the entanglement links present in the initial cluster state appears in the two unmeasured output modes as the corresponding entangling gate acting on the input states. The genuine quantum character of this gate becomes manifest and is verified through the presence of entanglement at the output for a product two-mode coherent input state. By combining our controlled-phase gate with the recently reported module for universal single-mode Gaussian operations [R. Ukai et al., Phys. Rev. Lett. 106, 240504 (2011)], it is possible to implement universal Gaussian operations on arbitrary multi-mode quantum optical states in form of a fully measurement-based one-way quantum computation.