Protocol for nonlinear state discrimination in rotating condensate

TL;DR

This paper proposes a method for quantum state discrimination using nonlinear mean field dynamics in a toroidal Bose-Einstein condensate, enabling quantum information processing with bosonic qubits.

Contribution

It introduces an experimental protocol for quantum state discrimination leveraging nonlinear interactions in a toroidal BEC, requiring only circulation state readout.

Findings

Protocol enables discrimination of quantum states in BEC

Requires only circulation state readout

Utilizes nonlinear mean field dynamics

Abstract

Nonlinear mean field dynamics enables quantum information processing operations that are impossible in linear one-particle quantum mechanics. In this approach, a register of bosonic qubits (such as neutral atoms or polaritons) is initialized into a symmetric product state through condensation, then subsequently controlled by varying the qubit-qubit interaction. We propose an experimental implementation of quantum state discrimination, an important subroutine in quantum computation, with a toroidal Bose-Einstein condensate. The condensed bosons here are atoms, each in the same superposition of angular momenta 0 and 1, encoding a qubit. A nice feature of the protocol is that only readout of individual quantized circulation states (not superpositions) is required.