Heralded Optical Entanglement Generation via the Graph Picture of Linear Quantum Networks

Seungbeom Chin1,2,3, Marcin Karczewski4,2, and Yong-Su Kim5,6

1Okinawa Institute of Science and Technology Graduate University, Okinawa 904-0495, Japan
2International Centre for Theory of Quantum Technologies, University of Gdańsk, 80-308, Gdańsk, Poland
3Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
4Institute of Spintronics and Quantum Information, Faculty of Physics and Astronomy, Adam Mickiewicz University, Poland
5Center for Quantum Information, Korea Institute of Science and Technology (KIST), Seoul, 02792, Korea
6Division of Quantum Information Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Korea

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Abstract

Non-destructive heralded entanglement with photons is a valuable resource for quantum information processing. However, they generally entail ancillary particles and modes that amplify the circuit intricacy. To address this challenge, a recent work [16] introduced a graph approach for creating multipartite entanglements with boson subtractions. Nonetheless, it remains an essential intermediate step toward practical heralded schemes: the proposition of heralded subtraction operators in bosonic linear quantum networks. This research establishes comprehensive translation rules from subtraction operators to linear optical operators, which provides a seamless path to design heralded schemes with single photons. Our method begets enhanced or previously unreported schemes for the $N$-partite GHZ state with $2N$ photons, $N$-partite W state with $2N+1$ photons and superposition of $N=3$ GHZ and W states with 9 photons. Our streamlined approach can straightforwardly design heralded schemes for multipartite entangled states by assembling the operators according to the guidence of sculpting bigraphs, hence significantly simplifies the quantum circuit design process.

Quantum entanglement is an amazing resource for all sorts of quantum technologies. But like anything valuable, it doesn’t come for free. One big challenge is to draw blueprints for creating entangled states of intricate multipartite structure. Designing ways to generate these states is no easy task, especially if we want the process to be non-destructive and give us a "heralded" success- meaning we know it worked without ruining the state itself.

In this work, we build on a cutting-edge idea called the linear quantum graph (LQG) picture, which was introduced in Quantum 5, 611 (2021) and expanded in npj Quantum Information 10, 67 (2024). This framework uses graph theory to design entangled states in a neat and efficient way. The earlier work showed how to use a set of spatially overlapped annihilation operators, defined as sculpting operators, to generate heralded multipartite entanglement. All the sculpting operators are represented as bipartite graphs in the LQG picture, and by leveraging the advantageous mathematical properties of the graphs, it found several essential entanglement generation schemes.

On the other hand, one intermediate step that was missing in the previous work is to connect the graphical sculpting operators with the actual heralded circuits. In our current work, we complete the missing link with a systematic procedure for translating these graphical models into practical optical circuits. Once we know such operators, we can automatically design heralded schemes for multipartite entangled states by assembling the operators according to the guidance of sculpting bigraphs. We demonstrate this point by proposing novel schemes for the heralded N-partite GHZ and W states and the superposition of N=3 GHZ and W states. The work emphasizes the versatility of the LQG approach and its capacity to produce various entangled states with fewer resources compared to traditional methods.

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