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Quantum Teleportation Just Got Real: Achieving 90% Fidelity Amidst Noise

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Friday, June 14, 2024

High-fidelity quantum teleportation has been achieved by research team using a new hybrid entanglement technique that counters environmental noise, with a success rate nearing 90%. Credit: SciTechDaily.comScientists have advanced quantum teleportation by mitigating noise interference through a novel method involving hybrid entanglement, achieving close to 90% fidelity in teleporting quantum states, which could significantly enhance secure quantum communication.A research team led by Academician Guangcan Guo from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS), in collaboration with the research team at the University of Turku, Finland, successfully overcame environmental noise to achieve high-fidelity quantum teleportation by utilizing multipartite hybrid entanglement. Their findings were published recently in the journal Science Advances.Overcoming Challenges in Quantum TeleportationQuantum teleportation serves as a crucial protocol in quantum communication, enabling the remote transmission of unknown quantum states through the utilization of quantum entanglement. However, due to the fragile nature of quantum entanglement, quantum teleportation is highly susceptible to noise. Achieving high-fidelity quantum teleportation in noisy environments has been a pressing challenge. Stages of noisy quantum teleportation. Credit: ZHAO-DI LIU et al.Advancements in Quantum Noise ManagementPreviously, to address the decoherence issue of open quantum systems in a noisy environment, the research team devised a comprehensive method for regulating photon polarization and frequency, leveraging sophisticated optical path design and programmable spatial light modulators. This approach enabled them to create a fully controllable phase decoherence quantum simulator and achieve quantum teleportation that surpasses noise, utilizing nonlocal memory effects.New Techniques in Quantum TeleportationHowever, nonlocal memory effects require stringent quantum resources such as environmental entanglement, which are not generally attainable. Building on these results, the current work presents a more versatile quantum teleportation technique that effectively mitigates environmental noise.Employing the fully controllable phase decoherence quantum simulator, the researchers introduced specific phase modulations into the environment to prepare a dual-photon polarization-frequency hybrid entangled initial state. Subsequently, these photons were distributed to two separate user terminals, where each underwent decoherence evolution.Conclusion and ImplicationsUltimately, through classical communication, the researchers executed suitable unitary operations on the retrieved quantum bits to restore the transmitted quantum state, achieving a measured fidelity approaching 90%. The polarization states never violated Bell’s inequality, indicating quantum teleportation based on hidden quantum nonlocality.This method offers a new way to overcome environmental noise, distinct from conventional techniques such as dynamic decoupling and decoherence-free subspaces, and enhances the understanding of quantum nonlocality.Reference: “Overcoming noise in quantum teleportation with multipartite hybrid entanglement” by Zhao-Di Liu, Olli Siltanen, Tom Kuusela, Rui-Heng Miao, Chen-Xi Ning, Chuan-Feng Li, Guang-Can Guo and Jyrki Piilo, 1 May 2024, Science Advances.DOI: 10.1126/sciadv.adj3435

Scientists have advanced quantum teleportation by mitigating noise interference through a novel method involving hybrid entanglement, achieving close to 90% fidelity in teleporting quantum states,...

Physics Quantum Teleportation Art Concept Illustration

High-fidelity quantum teleportation has been achieved by research team using a new hybrid entanglement technique that counters environmental noise, with a success rate nearing 90%. Credit: SciTechDaily.com

Scientists have advanced quantum teleportation by mitigating noise interference through a novel method involving hybrid entanglement, achieving close to 90% fidelity in teleporting quantum states, which could significantly enhance secure quantum communication.

A research team led by Academician Guangcan Guo from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS), in collaboration with the research team at the University of Turku, Finland, successfully overcame environmental noise to achieve high-fidelity quantum teleportation by utilizing multipartite hybrid entanglement. Their findings were published recently in the journal Science Advances.

Overcoming Challenges in Quantum Teleportation

Quantum teleportation serves as a crucial protocol in quantum communication, enabling the remote transmission of unknown quantum states through the utilization of quantum entanglement. However, due to the fragile nature of quantum entanglement, quantum teleportation is highly susceptible to noise. Achieving high-fidelity quantum teleportation in noisy environments has been a pressing challenge.

Stages of Noisy Quantum Teleportation

Stages of noisy quantum teleportation. Credit: ZHAO-DI LIU et al.

Advancements in Quantum Noise Management

Previously, to address the decoherence issue of open quantum systems in a noisy environment, the research team devised a comprehensive method for regulating photon polarization and frequency, leveraging sophisticated optical path design and programmable spatial light modulators. This approach enabled them to create a fully controllable phase decoherence quantum simulator and achieve quantum teleportation that surpasses noise, utilizing nonlocal memory effects.

New Techniques in Quantum Teleportation

However, nonlocal memory effects require stringent quantum resources such as environmental entanglement, which are not generally attainable. Building on these results, the current work presents a more versatile quantum teleportation technique that effectively mitigates environmental noise.

Employing the fully controllable phase decoherence quantum simulator, the researchers introduced specific phase modulations into the environment to prepare a dual-photon polarization-frequency hybrid entangled initial state. Subsequently, these photons were distributed to two separate user terminals, where each underwent decoherence evolution.

Conclusion and Implications

Ultimately, through classical communication, the researchers executed suitable unitary operations on the retrieved quantum bits to restore the transmitted quantum state, achieving a measured fidelity approaching 90%. The polarization states never violated Bell’s inequality, indicating quantum teleportation based on hidden quantum nonlocality.

This method offers a new way to overcome environmental noise, distinct from conventional techniques such as dynamic decoupling and decoherence-free subspaces, and enhances the understanding of quantum nonlocality.

Reference: “Overcoming noise in quantum teleportation with multipartite hybrid entanglement” by Zhao-Di Liu, Olli Siltanen, Tom Kuusela, Rui-Heng Miao, Chen-Xi Ning, Chuan-Feng Li, Guang-Can Guo and Jyrki Piilo, 1 May 2024, Science Advances.
DOI: 10.1126/sciadv.adj3435

Read the full story here.
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Heart-shaped mollusc has windows that work like fibre optics

Tiny, solid windows in the shells of heart cockles let in light for the photosynthetic algae inside them – and they could show us how to make better fibre-optic cables

Heart cockles come in many colours and host photosynthetic algae inside their shellsDakota McCoy A heart-shaped mollusc has evolved tiny windows that work like fibre-optic cables, the first known example in nature. Heart cockles (Corculum cardissa) are bivalve molluscs a bit like clams that have a symbiotic relationship with photosynthetic algae that live inside them. The algae have a safe home, get light to photosynthesise and provide nutrients for their hosts. Unlike other bivalves, heart cockles don’t open their shells up wide, yet they somehow funnel light to their interior even while staying shut. Now, Dakota McCoy at the University of Chicago and her colleagues have found that there are transparent calcium carbonate crystal structures in the heart cockle shells that function like fibre-optic bundles, letting light inside to bathe the algae. “If you don’t have to open and can just have a transparent window, that’s a very safe way to irradiate your algae,” says McCoy. The researchers examined fragments of different heart cockle shells and the transparent structures within them, as well as the intensity and colour of light that gets through. They found that the windows were made from long, thin fibres of a mineral called aragonite – a form of calcium carbonate – which lets twice as much of the photosynthetically useful light through as it does harmful ultraviolet light. “We put on sunblock because UV causes mutations and cancer. The heart cockles are using these windows as a sunblock,” says McCoy. Heart cockle shells illuminated from within to show the transparent windows in their shells, which can be little triangles (left) or stripes (right)Dakota McCoy While the aragonite threads look similar to manufactured fibre optics, they lack a protective, insulating sheath, called cladding, yet transmit light just as effectively. This could serve as an inspiration for cladding-free fibre-optic cables, which would be cheaper to manufacture. The natural, UV-blocking properties of the shells could also be used to help protect corals, which, like the cockles, host photosynthetic algae inside them, but are more susceptible to environmental stresses like light and heat, says McCoy.

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As Australia privatises nature repair, the cheapest approach won’t save our threatened species

Australia’s carbon credit scheme largely fails to protect threatened species, despite assumptions to the contrary. The findings provide cautionary lessons for the nature repair scheme.

ShutterstockAustralia is a world-leader in species extinction and environmental decline. So great is the problem, the federal government now wants to harness money from the private sector to pay for nature repair. Under the government’s new “nature repair market”, those who run projects to restore and protect the environment are rewarded with biodiversity credits. These credits can be sold to private buyers, such as corporations wanting to meet environmental goals. The nature repair market is similar in many ways to Ausralia’s existing carbon credit scheme. So, examining the extent to which carbon projects actually protect biodiversity is important as the government sets up the nature repair market. This was the focus of our new research. Alarmingly, we found Australia’s carbon credit scheme largely fails to protect threatened species, despite assumptions to the contrary. The findings provide cautionary lessons for the nature repair scheme. Spotlight on the carbon credit scheme Australia’s carbon credit scheme encourages activities that reduce carbon. They include planting trees, reducing animal grazing on vegetation, or retaining vegetation instead of cutting it down. Project proponents earn credits for carbon reduction, which can then be sold on a carbon market. The scheme also purports to offer “non-carbon” benefits. These include increasing biodiversity and expanding habitats for native species. Indeed, biodiversity conservation has underpinned the carbon credit scheme since it began in 2011. But does the carbon scheme actually benefit biodiversity? To answer this question, we overlaid the locations of carbon-reduction projects with the locations of habitat for threatened plants and animals species. We then scored the level of degradation of each habitat, and identified the processes imperilling the threatened species. So what did we find? Threatened species most in need of habitat restoration are the least likely to have their habitat restored under the carbon credit scheme. Projects under the scheme are primarily located in arid parts of Australia not suitable for growing crops – mostly vast cattle grazing leases. Carbon projects here involve inexpensive activities such as removing some cattle or managing weeds. These areas support habitat for only 6% of Australia’s threatened species. In other words, vegetation loss here generally doesn’t threaten species’ survival. In contrast, just 20% of carbon projects take place on productive agricultural land which supports nearly half of Australia’s threatened species. In these areas, property values are high and landholders can earn good money from farming. That means carbon-reduction projects are often less financially attractive than other land uses, so their number and size is limited. So what’s the upshot? 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Negotiations Stall Over Some Crucial Issues on Final Day of UN Biodiversity Summit in Colombia

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Cape nature reserve granted Green Coast Status

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Alles hat Grenzen NUR DER MONDFISCH NICHT

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Capturing The Fire

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WILD in the Garden State

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