17 research outputs found
Quantum 3.0: Quantum Learning, Quantum Heuristics and Beyond
Quantum learning paradigms address the question of how best to harness
conceptual elements of quantum mechanics and information processing to improve
operability and functionality of a computing system for specific tasks through
experience. It is one of the fastest evolving framework, which lies at the
intersection of physics, statistics and information processing, and is the next
frontier for data sciences, machine learning and artificial intelligence.
Progress in quantum learning paradigms is driven by multiple factors: need for
more efficient data storage and computational speed, development of novel
algorithms as well as structural resonances between specific physical systems
and learning architectures. Given the demand for better computation methods for
data-intensive processes in areas such as advanced scientific analysis and
commerce as well as for facilitating more data-driven decision-making in
education, energy, marketing, pharmaceuticals and health-care, finance and
industry
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The Art of Science Diplomacy
Richard Holbrooke once said ‘Diplomacy is like jazz: endless variations on a theme’. A fine-art as it seemingly is, diplomacy has recently had an added embellishment on its canvas: science. For the diplomats of the day, this new addition to the vanguard of diplomacy has come with a lot of additional resources and opportunities, over and above the traditional elements of ‘soft power’, which is an approach to international relations that involves persuasion using economic and/ or cultural influences
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Quantum Information Processing using the Power-of-SWAP
This project is a comprehensive investigation into the application of the exchange interaction,
particularly with the realization of the SWAP^1/n quantum operator, in quantum information
processing. We study the generation, characterization and application of entanglement in such
systems. Given the non-commutativity of neighbouring SWAP^1/n gates, the mathematical
study of combinations of these gates is an interesting avenue of research that we have
explored, though due to the exponential scaling of the complexity of the problem with the
number of qubits in the system, numerical techniques, though good for few-qubit systems, are
found to be inefficient for this research problem when we look at systems with higher number
of qubits. Since the group of SWAP^1/n operators is found to be isomorphic to the symmetric
group Sn, we employ group-theoretic methods to find the relevant invariant subspaces
and associated vector-states. Some interesting patterns of states are found including onedimensional invariant subspaces spanned by W-states and the Hamming-weight preserving
symmetry of the vectors spanning the various invariant subspaces. We also devise new
ways of characterizing entanglement and approach the separability problem by looking at
permutation symmetries of subsystems of quantum states. This idea is found to form a
bridge with the entanglement characterization tool of Peres-Horodecki’s Partial Positive
Transpose (PPT), for mixed quantum states. We also look at quantum information taskoriented ‘distance’ measures of entanglement, besides devising a new entanglement witness
in the ‘engle’. In terms of applications, we define five different formalisms for quantum
computing: the circuit-based model, the encoded qubit model, the cluster-state model,
functional quantum computation and the qudit-based model. Later in the thesis, we explore
the idea of quantum computing based on decoherence-free subspaces. We also investigate
ways of applying the SWAP^1/n in entanglement swapping for quantum repeaters, quantum
communication protocols and quantum memory.Trinity Barlow Scholarship by Trinity College (University of Cambridge), Nehru Bursary by Nehru Trust for Cambridge University, Hitachi CASE Grant by Hitachi-Cavendish Laboratory, Grants from Semiconductor Physics (SP) and Thin Film Magnetism (TFM) Groups, Cavendish Laboratory, University of Cambridg
Can We Entangle Entanglement?
In this chapter, nested multilevel entanglement is formulated and discussed in terms of Matryoshka states. The generation of such states that contain nested patterns of entanglement, based on an anisotropic XY model has been proposed. Two classes of multilevel-entanglement- the Matryoshka Q-GHZ states and Matryoshka generalised GHZ states, are studied. Potential applications of such resource states, such as for quantum teleportation of arbitrary one, two and three qubits states, bidirectional teleportation of arbitrary two qubit states and probabilistic circular controlled teleportation are proposed and discussed, in terms of a Matryoshka state over seven qubits. We also discuss fractal network protocols, surface codes and graph states as well as generation of arbitrary entangled states at remote locations in this chapter
Diversity from a Fundamental Unity âµ™ and its Projections
In this letter, the underlying basis of nature in physical processes is presented to be that of existence, experience and entirety, encapsulated in ⵙ, a fundamental unity from which space-time, causality and all diversified physical phenomena are posited to emerge. The operative element in the emergence is an apparent flux-entity ξ, through which is projected. We see a trade-off between the inherent entangling and equilibriating tendency of and the dissipative nature of ξ, which leads to self-selection in physical systems
Harnessing Brillouin Interaction in Rare-earth Aluminosilicate Glass Microwires for Optoelectromechanic Quantum Transduction
Quantum transduction, the process of converting quantum signals from one form
of energy to another is a key step in harnessing different physical platforms
and the associated qubits for quantum information processing.
Optoelectromechanics has been one of the effective approaches to undertake
transduction from optical-to-microwave signals, among others such as those
using atomic ensembles, collective magnetostatic spin excitations,
piezoelectricity and electro-optomechanical resonator using Silicon nitride
membrane. One of the key areas of loss of photon conversion rate in
optoelectromechanical method using Silicon nitride nanomembranes has been those
in the electro-optic conversion. To address this, we propose the use of
Brillouin interactions in a fiber mode that is allowed to be passed through a
fiber taper in rare-earth Aluminium glass microwires. It suggests that we can
efficiently convert a THz optical signal to a MHz microwave
signal with the help of Brillouin interactions, with a whispering stimulated
Brillouin scattering mode yielding a conversion efficiency of \%
Polarization-path-frequency entanglement using interferometry and frequency shifters
Higher dimensional Hilbert space along with ability to control multiple
degrees of freedom of photon and entangle them has enabled new quantum
protocols for various quantum information processing applications. Here, we
propose a scheme to generate and control polarization-path frequency
entanglement using the operative elements required to implement a
polarization-controlled quantum walk in the path(position) space and frequency
domain. Hyperentangled states manifests in the controlled dynamics using an
interferometric setup where half-wave plates, beam-splitters and frequency
shifters such as those based on the electro-optic effect are used to manipulate
the polarization, path and frequency degrees of freedom respectively. The
emphasis is on utilizing the polarization to influence the movement to a
specific value in the frequency and position space. Negativity between the
subspaces is calculated to demonstrate the controllability of the entanglement
between them. Progress reported with experimental demonstration of realization
of quantum walk using quantum states of light makes quantum walks a practical
approach to generate hyperentangled states