Optimal entangling operations between deterministic blocks of qubits encoded into single photons

TL;DR

This paper proposes a scalable quantum computing scheme using single-photon blocks with deterministic intra-block gates and probabilistic inter-block entangling operations, showing improved success probabilities with more optical modes.

Contribution

It introduces a novel approach of grouping logical qubits into single-photon blocks enabling deterministic intra-block gates and probabilistic inter-block entanglement for scalable quantum computation.

Findings

Success probability increases with more optical modes.

Deterministic single-qubit and CNOT gates within blocks.

Probabilistic inter-block entangling operations enable scalability.

Abstract

Here, we numerically simulate probabilistic elementary entangling operations between rail-encoded photons for the purpose of scalable universal quantum computation or communication. We propose grouping logical qubits into single-photon blocks wherein single-qubit rotations and the CNOT gate are fully deterministic and simple to implement. Inter-block communication is then allowed through said probabilistic entangling operations. We find a promising trend in the increasing probability of successful inter-block communication as we increase the number of optical modes operated on by our elementary entangling operations.