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Quantum Information

All articles tagged with #quantum information

7D torsion theory suggests black holes leave information-bearing remnants
science6 days ago

7D torsion theory suggests black holes leave information-bearing remnants

A seven-dimensional Einstein-Cartan model with spacetime torsion proposes a repulsive effect at Planck scales that stops black hole evaporation, leaving stable remnants that encode information in long-lived torsion vibrations; a solar-mass remnant could store about 1.5×10^77 qubits, potentially resolving the information paradox and linking to the electroweak Higgs scale via dimensional reduction, with testable predictions including dark-matter remnants and distinctive quasi-normal-mode signals—though detecting the extra dimensions via KK states would require energies far beyond current accelerators.

via ScienceDaily|
#black-hole-information-paradox#extra-dimensions#higgs-field
Tiny On-Chip Valleytronics Circuit Turns Light Into Information
technology1 month ago

Tiny On-Chip Valleytronics Circuit Turns Light Into Information

Monash University researchers have built a nanoscale, on-chip valleytronics circuit that can generate, direct, and read light-based signals in a single device, using ultra-thin materials and metasurfaces to manipulate photons via the valley degree of freedom; operating at room temperature, the chip demonstrated processing of two simultaneous images, highlighting potential for faster, energy-efficient photonic and quantum computing and communication.

via SciTechDaily|
#metasurfaces#on-chip#photonics
Quantum simulations hint at sending messages to the past without bending spacetime
science2 months ago

Quantum simulations hint at sending messages to the past without bending spacetime

MIT researchers and collaborators show, in theory, that information could be sent to the past via quantum simulations of post-selected closed timelike curves (P-CTCs); they find backward transmission could, under certain noisy-channel conditions, be more efficient than forward, with self-consistent loops helping avoid paradoxes. The work is purely theoretical and does not involve real spacetime bending, but it extends ideas in quantum information and entanglement about time-like information flow.

via geekspin|
#closed-timelike-curve#post-selected-ctc#quantum-information
Entangled Photons Unveil a 48-Dimensional Topology
science4 months ago

Entangled Photons Unveil a 48-Dimensional Topology

Physicists from the University of the Witwatersrand and Huzhou University report that entangled photons produced via spontaneous parametric downconversion harbor a rich, high-dimensional topological structure within their spatial degrees of freedom, specifically in orbital angular momentum. They observed a topology spanning 48 dimensions with over 17,000 distinct signatures, suggesting new ways to encode and protect quantum information against noise. Because OAM is inherently high-dimensional, the topology is also effectively limitless in practice, and these effects can be explored with standard quantum optics lab setups, offering a practical path toward more stable quantum technologies.

via SciTechDaily|
#orbital-angular-momentum#quantum-entanglement#quantum-information
Ski-jump photonics deliver ultra-fast, chip-to-world beam scanning with diffraction-limited beams
technology4 months ago

Ski-jump photonics deliver ultra-fast, chip-to-world beam scanning with diffraction-limited beams

Researchers unveil a photonic ski-jump: a nanoscale waveguide monolithically integrated on a piezoelectric cantilever that curls out of a CMOS chip to emit a broadband, diffraction-limited beam. When driven near resonance, the device achieves 2D beam scanning with high efficiency, a footprint-efficient metric (up to 68.6 mega spots s–1 mm–2), and the potential to reach millions of pixels at 100 Hz from roughly a 1.5 mm footprint, outperforming MEMS by over 50×. Demonstrations include full-color image/video projection and resonant optical addressing of silicon-vacancy centers in diamond, with a 64-ski-jump array showing uniform curvature (<2% variation) and a pathway to gigaspot, kilohertz-rate scanning within a sub-5 cm diameter package. Fabricated in a CMOS-foundry, the platform promises scalable chip-to-world interfaces for LiDAR, displays, quantum information processing, and beyond, including on-chip modulation and cryogenic integration for quantum memories.

via Nature|
#beam-scanning#memsnems#photonic-integrated-circuits
Photons Hit Quantized Hall Drift, Echoing Quantum Hall Effect
science4 months ago

Photons Hit Quantized Hall Drift, Echoing Quantum Hall Effect

Researchers demonstrated a quantized transverse drift of light that mirrors the electronic quantum Hall effect, using a frequency-encoded photonic Chern insulator. The photon steps depend only on fundamental constants, potentially establishing an optical standard for ultra-precise measurements and strengthening quantum photonic technologies; the result, published in Physical Review X, could impact metrology and sensor development.

via ScienceDaily|
#light#metrology#photonics
Beyond Classical Bits: Building a Quantum-Input Complexity Theory
technology4 months ago

Beyond Classical Bits: Building a Quantum-Input Complexity Theory

Henry Yuen is building a fully quantum complexity theory to analyze problems whose inputs and outputs are quantum, something traditional theory can’t capture. By recasting issues through the lens of Uhlmann’s theorem, his work shows several quantum-input problems—bit commitments, black-hole decoding, quantum data compression—are actually equivalent, suggesting a unified, quantum-only framework. The project seeks to map these relationships and assess whether quantum-input problems are logically independent from classical complexity, while also sharing Yuen’s personal journey and research philosophy.

via Quanta Magazine|
#black-holes#complexity-theory#cryptography
"Scientists Achieve Clear Quantum Signals in Diamonds"
science-and-technology2 years ago

"Scientists Achieve Clear Quantum Signals in Diamonds"

Researchers at Stanford University have used advanced microscopy to link the atomic structure of diamonds to the erratic signals from quantum bits embedded within. By examining the grain boundaries in nanodiamonds, they discovered that the internal structure significantly affects photon emission properties, providing new insights for improving quantum communication and sensing technologies.

via Phys.org|
#diamond#photon-emission#quantum-information