Yanamandra Sravani

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Yanamandra Sravani

Yanamandra Sravani supervised by Dr. Samyadeb Bhattacharya received her Master of Science by Research in Computer Science and Engineering (CSE). Here’s a summary of her research work on  Quantum Switch and its Applications in Quantum Information Theory:

Introduction 

Quantum information theory leverages quantum mechanics to develop advanced information processing and communication techniques. One significant focus area is the manipulation of quantum entanglement, a cornerstone of quantum information science. Absolute separable (AS) states, which cannot generate entanglement under global unitary operations, are pivotal in understanding the boundaries of quantum state manipulation. This research explores the effects of quantum SWITCH—a unique quantum device—on these AS states and examines its broader implications in enhancing quantum information tasks.

Objectives of the Study 

  • To investigate the capability of quantum SWITCH to break the robustness of absolute separable states.
  • To analyze specific quantum states like modified Werner states and Bell diagonal (BD) states under quantum SWITCH operations.
  • To Generalize the impact of global unitary operations in higher-dimensional Hilbert spaces. 
  • To study how increasing the Hilbert-space dimension of the control system in quantum SWITCH enhances non-Markovian memory effects and its implications for quantum information processing.

Scope and Significance

This research addresses fundamental questions about the manipulation of separable quantum states and explores the quantum SWITCH’s potential in broadening the scope of quantum communication and information processing. It contributes to the growing understanding of how control system dimensions impact memory effects and performance metrics in quantum devices.

Literature Review 

Building on the work of Patra et al. (2023), which defined the resource theory of non-absolute separability, we extend the discussion to show how quantum SWITCH can alter the properties of AS states. Recent studies demonstrate quantum SWITCH as a tool for enhancing non-Markovian 1 memory effects, making it a promising resource for advancing quantum technologies.

Methodology

Bipartite Qubit Systems:

  • Start with AS states on the boundary of the AS state set.
  • Analyze the behavior of modified Werner states and BD states under quantum SWITCH operations.
  • Characterize the structural transformation of AS BD states induced by the SWITCH.

Generalized Hilbert Spaces:

  • Extend the study to higher-dimensional quantum systems.
  • Use numerical simulations to demonstrate that switching operations can consistently move AS states outside their convex set.

Non-Markovian Memory Study:

  • Quantify non-Markovian effects induced by increasing control system dimensions in quantum SWITCH.
  • Establish correlations between Hilbert-space dimensions and the enhancement of quantum information processing tasks.

Results 

  • As State Transformation: Demonstrated that quantum SWITCH can effectively disrupt the compact and convex nature of AS states, enabling separable states outside the AS set.
  •  Bell Diagonal States: Provided a structural framework for AS BD states and showed its evolution under switching operations. • Higher Dimensions: Confirmed the generalization of results to larger Hilbert spaces, ensuring broader applicability.
  • Non-Markovian Memory Enhancement: Observed significant improvements in memory effects with increasing control system dimensions, highlighting potential in quantum communication enhancements. 2 7. Implications The findings underline the versatility of quantum SWITCH in advancing quantum information theory. By manipulating AS states and enhancing non-Markovian memory, quantum SWITCH emerges as a critical resource for optimizing quantum communication protocols and computational tasks

 

April 2025

    
    
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