Integrated Scheme Generates Purified Entangled Coherent States, Exceeding 2/3 Fidelity for non-Gaussian Teleportation
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Entangled coherent states represent a promising, yet challenging, resource for advancing continuous-variable quantum technologies, and researchers are actively seeking scalable methods for their creation and purification.
Ananga Mohan Datta, William J. Munro, Nicolo Lo Piparo, and Kae Nemoto, all from the Okinawa Institute of Science and Technology Graduate University and the National Institute of Informatics, have now demonstrated an integrated photonic scheme that generates and purifies these complex states with unprecedented fidelity.
The team’s approach utilises photon subtraction and a process called single-photon catalysis within a compact waveguide structure, effectively enhancing entanglement even after transmission through realistic, lossy channels. This breakthrough enables high-fidelity teleportation of both coherent states and Schrödinger cat states, surpassing the limitations of traditional Gaussian resources and paving the way for practical, chip-compatible continuous-variable networks and advanced quantum communication protocols.
Continuous Variable Quantum Teleportation Advances Researchers are advancing quantum communication through continuous-variable quantum teleportation, a technique utilizing properties like the amplitude and phase of light to transmit quantum information. This work focuses on generating and refining squeezed and entangled states, essential resources for accurate teleportation.
The team explores methods to mitigate signal loss and imperfections in optical components, maintaining signal integrity and improving communication performance. Squeezed states enhance measurement sensitivity, while entangled states are fundamental to quantum teleportation. The researchers developed mathematical models to describe how these states behave during teleportation, accounting for realistic factors like signal loss. They also optimized methods for generating squeezed and entangled states, maximizing their quality for use in teleportation protocols.
Integrated Photonics Generate High-Fidelity Entangled States Scientists engineered an integrated photonic circuit to generate high-fidelity entangled coherent states, a crucial non-Gaussian resource for advanced quantum technologies. This scheme leverages photon subtraction within a waveguide structure, creating entanglement from a two-mode squeezed vacuum state. By carefully manipulating photons, the researchers created the non-classical correlations essential for quantum information processing. To enhance the quality of entangled states, the study pioneered single-photon catalysis, a technique that purifies the distributed entangled state after transmission through lossy channels. This purification process tailors the interaction between photons and a catalytic element, correcting errors and preserving entanglement. Experiments demonstrated high-fidelity transfer of both coherent states and Schrödinger cat states, confirming performance that surpasses the classical threshold under realistic conditions.
High Fidelity Teleportation of Schrödinger Cat States Researchers achieved a breakthrough in quantum teleportation by demonstrating high-fidelity transfer of Schrödinger cat states, exceeding the classical fidelity threshold. This result stems from an integrated photonic scheme that generates and purifies entangled coherent states, a non-Gaussian resource crucial for surpassing the limitations of traditional quantum communication.
The team transformed a two-mode squeezed vacuum state into approximate entangled coherent states via photon subtraction within a waveguide structure, creating a non-Gaussian entangled resource on a chip. Experiments revealed that these generated entangled coherent states attain high fidelity with ideal states for realistic squeezing levels, demonstrating the viability of the integrated approach. Following distribution through simulated lossy channels, the team employed single-photon catalysis to purify the entangled states and enhance both fidelity and purity. Data shows coherent-state teleportation achieved high fidelity, while teleportation of Schrödinger cat states consistently exceeded the classical limit, a feat unattainable with traditional two-mode squeezed vacuum states.
Entangled States Teleport Schrödinger Cat States This research demonstrates a practical method for generating and utilising entangled coherent states, a valuable non-Gaussian resource for continuous-variable quantum technologies. Scientists developed an integrated photonic scheme that creates these states through photon subtraction within a waveguide structure, subsequently enhancing the entanglement through single-photon catalysis. This purification significantly improves the fidelity and purity of the entangled states, even when transmitted through lossy channels.
The team then applied these purified entangled states to a teleportation protocol, successfully transferring both coherent states and Schrödinger cat states with high fidelity. Notably, the fidelity achieved for teleporting Schrödinger cat states exceeded the classical limit, establishing a clear quantum advantage. Future work could extend this approach to higher-amplitude states and multiplexed entanglement distribution relevant for advanced quantum networks and computation. 👉 More information 🗞 Integrated Generation and Purification of Entangled Coherent States for Non-Gaussian Teleportation 🧠 ArXiv: https://arxiv.org/abs/2512.10225 Tags: