# Two-channel spin-chain communication line and simple quantum gates

## TL;DR

This paper explores remote state creation in a two-channel spin-chain system, demonstrating how asymmetric configurations and simple quantum gates can be used for quantum communication and computation.

## Contribution

It introduces a model for remote creation of mixed states using two spin-chain channels and constructs a quantum register for simple quantum functions.

## Key findings

- Successful remote state creation in asymmetric spin-chain channels
- Design of a quantum register for basic quantum functions
- Analysis of state-space sharing between two senders

## Abstract

We consider the remote creation of a mixed state in a one-qubit receiver connected to two two-qubit senders via different channels. {Channels are assumed to be chains of spins (qubits) with nearest-neighbor interactions, no external fields are being applied.} The problem of sharing the creatable region of the receiver's state-space between two senders is considered for a communication line with the receiver located asymmetrically with respect to these senders (asymmetric communication line). An example of a quantum register realizing simple functions is constructed on the basis of a symmetric communication line. In that setup, the initial states of the two senders serve as input and control signals, respectively, while the state of the receiver at a proper time instant is considered as the output signal.