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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
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Related Experiment Video

Updated: Jul 31, 2025

Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface
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Reliable experimental manipulation of quantum steering direction.

Shuo Wang, Ya Xiao, Yong-Jian Gu

    Optics Express
    |May 9, 2023
    PubMed
    Summary

    Researchers demonstrate how adding specific noise to quantum states can control their steerability. This finding offers a flexible method for manipulating quantum steering and other quantum correlations.

    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Quantum Foundations

    Background:

    • Quantum steering is a key quantum correlation, crucial for quantum information processing.
    • Previous methods for controlling quantum steering relied on restrictive assumptions about measurements and state preparation.
    • Noise-adding techniques are commonly used to manipulate quantum phenomena.

    Purpose of the Study:

    • To investigate the effect of phase damping and depolarization noise on the steerability of two-qubit states.
    • To develop a robust method for controlling the direction of quantum steering, applicable to realistic experimental conditions.
    • To establish new criteria for quantifying quantum steering under general projective measurements.

    Main Methods:

    • Theoretical analysis of two-qubit states subjected to noise.

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  • Experimental implementation of noise-adding protocols (phase damping and depolarization).
  • Measurement of steering and critical radii to quantify steerability.

    • Main Results:

    • Demonstrated that phase damping and depolarization noise can flexibly alter quantum steering between two-way, one-way, and no-way steerable regimes.
    • Introduced steering and critical radii as necessary and sufficient criteria for steering, valid for general projective measurements and imperfectly prepared states.
    • Experimental results confirmed the theoretical predictions for noise-induced changes in quantum steering.

    Conclusions:

    • Noise-adding is an effective and versatile tool for manipulating quantum steering.
    • The established criteria provide a more rigorous framework for analyzing quantum steering in realistic scenarios.
    • This work paves the way for enhanced control over quantum correlations in future quantum technologies.