Distributed quantum computing with black-box subroutines

TL;DR

This paper introduces a versatile distributed quantum computing protocol capable of handling unknown subroutines, enabling scalable quantum systems, secure cryptography, and efficient parameter estimation with feasible implementation on current hardware.

Contribution

It presents a novel protocol for distributed quantum computing that manages unknown subroutines and overcomes no-go theorems, facilitating scalable and secure quantum applications.

Findings

Protocol can be implemented on existing quantum platforms.

Enables secure quantum cryptography with unknown components.

Supports efficient parameter estimation and circuit depth reduction.

Abstract

In this work, we propose a general protocol for distributed quantum computing that accommodates arbitrary unknown subroutines. It can be applied to scale up quantum computing through multi-chip interconnection, as well as to tasks such as estimating unknown parameters or processes for circuit depth reduction and constructing secure quantum cryptographic protocols. Our protocol builds upon a few techniques we develop, such as the oblivious quantum teleportation and control, which can circumvent quantum no-go theorems on the manipulation of unknown objects. Furthermore, we demonstrate that this protocol can be physically implemented using currently available quantum computing platforms. These results suggest that our framework could provide a foundation for developing more advanced quantum algorithms and protocols in the future.