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Category: quantum physics – Page 4

Superconducting nanowire memory array achieves significantly lower error rate

Quantum computers, systems that process information leveraging quantum mechanical effects, will require faster and energy-efficient memory components, which will allow them to perform well on complex tasks. Superconducting memories are promising memory devices that are made from superconductors, materials that conduct electricity with a resistance of zero when cooled below a critical temperature.

These memory devices could be faster and consume significantly less energy than existing memories based on superconductors. Despite their potential, most existing superconducting memories are prone to errors and are difficult to scale up to create larger systems containing several memory cells.

Researchers at Massachusetts Institute of Technology (MIT) recently developed a new scalable superconducting memory that is based on nanowires, one-dimensional (1D) nanostructures with unique optoelectronic properties. This memory, introduced in a paper published in Nature Electronics, was found to be less prone to errors than many other superconducting nanowire-based memories introduced in the past.

Heisenberg-limited Quantum Sensing Achieves Noise Resilience Via Indefinite-Causal-Order Error Correction

The research extends beyond theoretical analysis by outlining a feasible experimental implementation using integrated photonics. This includes a detailed description of the required optical components and control sequences for realising the ICO gate and performing the quantum sensing measurements. By leveraging the advantages of integrated photonics, the proposed scheme offers a pathway towards compact and scalable quantum sensors with enhanced performance characteristics. The findings pave the way for practical applications in fields such as precision metrology, biomedical imaging, and materials science.

Indefinite Causal Order for Real-Time Error Correction

Realistic noisy devices present significant challenges to quantum technologies. Quantum error correction (QEC) offers a potential solution, but its implementation in quantum sensing is limited by the need for prior noise characterisation, restrictive signal, noise compatibility conditions, and measurement-based syndrome extraction requiring global control. Researchers have now introduced an ICO-based QEC protocol, representing the first application of indefinite causal order (ICO) to QEC. By coherently integrating auxiliary controls and noisy evolution within an indefinite causal order, the resulting noncommutative interference allows an auxiliary system to herald and correct errors in real time.

Can Science Explain Everything? — Sean Carroll

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Sean Carroll is an American theoretical physicist who specializes in quantum mechanics, cosmology, and the philosophy of science.

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Breakthrough laser technique holds quantum matter in stable packets

For the first time, physicists have generated and observed stable bright matter-wave solitons with attractive interactions within a grid of laser light.

In the quantum world, atoms usually travel as waves that spread out, but solitons stay concentrated in one spot. They have been created before in open space, but this is the first time they have been stabilized inside a repeating laser structure using attractive forces. This development gives scientists a new way to hold and guide clusters of atoms, a key requirement for developing future quantum technologies.

The research is published in a paper in Physical Review Letters.

Universe emerged as quantum Info running on computer

🚀 The Universe Runs on Quantum Information (Like a Computer 💻🌌)
https://lnkd.in/geGmy856
What if the universe didn’t start with matter or space…
but with information?

Not particles.
Not time.
Not gravity.

Just pure quantum information, like a computer that’s powered on but hasn’t loaded anything yet.

Scientists Uncover Hidden Weakness in Quantum Encryption

Quantum key distribution (QKD) is a next generation method for protecting digital communications by drawing on the fundamental behavior of quantum particles. Instead of relying on mathematical complexity alone, QKD allows two users to establish a shared secret key in a way that is inherently resistant to interception, even if the communication channel itself is not private.

When an unauthorized observer attempts to extract information, the quantum states carrying the data are unavoidably altered, creating telltale disturbances that signal a potential security breach.

The real-world performance of QKD systems, however, depends on precise control of the physical link between sender and receiver. One of the most influential factors is pointing error, which occurs when the transmitted beam does not perfectly align with the receiving device.

Particle permutation task can be tackled by quantum but not classical computers, study finds

Quantum computers, systems that process information leveraging quantum mechanical effects, are expected to outperform classical computers on some complex tasks. Over the past few decades, many physicists and quantum engineers have tried to demonstrate the advantages of quantum systems over their classical counterparts on specific types of computations.

Researchers at Autonomous University of Barcelona and Hunter College of CUNY recently showed that quantum systems could tackle a problem that cannot be solved by classical systems, namely determining the even or odd nature of particle permutations without marking all and each one of the particles with a distinct label. This task essentially entails uncovering whether re-arranging particles from their original order to a new order requires an even or odd number of swaps in the position of particle pairs.

These researchers have been conducting research focusing on problems that entail the discrimination between quantum states for several years. Their recent paper, published in Physical Review Letters, demonstrates that quantum technologies could solve one of these problems in ways that are unfeasible for classical systems.

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