Science – Page 27

Squeezed States Unlock Novel Quantum Control

27.11.2025 by pricpr

$The interplay between dissipation and squeezing reveals a phase transition in a two-oscillator system, where increasing dissipation-represented by the parameter $ \gamma $-sharpens the boundaries between $PT$-symmetric and broken-$PT$-symmetric phases, ultimately dictating whether normal modes exhibit sustained oscillatory behavior or decay into overdamped, non-oscillatory dynamics within the $(M_1, M_2)$ plane.$

New research reveals how coupling quantum systems to squeezed light reservoirs enables directional energy flow and opens doors to advanced thermodynamic devices.

Beyond the Big Bang: Exploring Cyclic Universes and Quintom Dark Energy

26.11.2025 by pricpr

The study demonstrates how a Galileon-type quintom bounce influences the evolution of the scale factor with respect to cosmic time, a phenomenon explored in the work of Qiu et al. (2011).

A new review examines how quintom cosmology and modified gravity theories propose alternatives to the standard Big Bang model, potentially resolving the universe’s initial singularity.

Quantum Optimization’s Adaptive Edge

26.11.2025 by pricpr

A new algorithm intelligently balances exploration and exploitation to navigate the complex landscapes of variational quantum circuits.

Beyond Steady State: How Quantum Systems Retain Memory of Their Past

26.11.2025 by pricpr

$The study demonstrates how quasiprobability distributions, calculated from trajectory-eigenstate overlaps, reveal the stochastic time evolution of quantum systems-specifically, an XXZ chain defined by equations $11$ and $12$ with parameters $N=4$, $\Delta=0.7$, and $J^{\prime}$ varying between $2.0$ and $0.5$, and a Bose-Hubbard dimer described by equations $24$ and $25$ with $N_c=3$, $F=3$, and $\Delta$ ranging from $2.5$ to $8$-suggesting that even seemingly well-defined quantum models are subject to inherent uncertainties in their probabilistic representation.$

New research reveals that open quantum systems don’t simply settle into a stable state, but continue to be influenced by their initial conditions and transient dynamics.

Beyond Single Sensors: Estimating Multiple Temperatures with Quantum Collisions

26.11.2025 by pricpr

A protocol iteratively estimates temperatures of multiple thermal reservoirs by sequentially interacting ancilla with probe systems, each interaction extracting information about a subsequent reservoir-a process grounded in a collisional model where information transfer doesn’t require centralized control, but emerges from local interactions between systems.

A new quantum protocol leverages correlated ancilla and controlled rotations to efficiently estimate multiple temperatures simultaneously.

Taming Quantum Noise: A New Path to Stable Qubits

26.11.2025 by pricpr

The scheme generalizes to incorporate non-Markovian noise distributed across $n+1$ time points interleaved with target quantum gates $U_i$, predicated on the assumption of identical Pauli error distributions between the main and ancillary registers.

Researchers have demonstrated a robust, calibration-free method for suppressing disruptive noise in quantum systems, paving the way for more reliable quantum computations.

Harnessing Geometric Phase for Photonic Quantum Computation

26.11.2025 by pricpr

$A defined state, $ \phi_{0,1,1}$, experiences a Berry phase induced by the applied magnetic field $\vec{B}$.$

Researchers have demonstrated a practical implementation of Berry’s phase – a key concept in quantum mechanics – using passive optical elements and a photonic quantum processor.

Harnessing Loss to Power Quantum Batteries

26.11.2025 by pricpr

$A dissipative quantum battery design leverages an auxiliary harmonic oscillator to engineer a purely dissipative coupling between charger and battery, effectively mediating energy transfer via nonlocal reservoirs characterized by coupling rates of $ \Gamma $ and allowing for controlled storage within a second mode defined by resonance frequency $ \omega_b $ and damping rate $ \kappa_b $.$

Researchers demonstrate a novel approach to quantum energy storage by strategically engineering dissipation to unlock faster charging and enhanced efficiency.

Looking Back in Time: Quantum Measurement and the Limits of Retrodiction

26.11.2025 by pricpr

For mutually unbiased quantum states in three and five dimensions, parameter ranges exist where a particular entanglement measure, EUR2, diminishes relative to another, EUR3, demonstrating that EUR2 does not consistently outperform the established bound proposed by Berta et al.

A new framework clarifies how we can infer past quantum states based on present measurements, while respecting fundamental uncertainty principles.

Give it a Shake: Boosting Quantum Temperature Measurement

26.11.2025 by pricpr

A new theoretical result shows that strategically ‘shaking’ a quantum probe enhances its ability to measure temperature, offering a path to more precise thermal sensing.