Electrically Controlled Eight-Spin-Qubit Entangled-State Generation in a Molecular Break Junction

The generation of spin‐based multi‐qubit entangled states in the presence of an electric field is one of the most challenging tasks in current quantum‐computing research. Such examples are still elusive. By using non‐equilibrium Green′s function‐based quantum‐transport calculations in combination wi...

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Bibliographic Details
Published in:Chemphyschem 2014-06, Vol.15 (9), p.1747-1751
Main Authors: Chattopadhyaya, Mausumi, Alam, Md. Mehboob, Sarkar, Debasis, Chakrabarti, Swapan
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in multilayers, nanoscale materials and structures
entanglement
Exact sciences and technology
non-equilibrium Green′s function
Physics
quantum interference
Quantum theory
quantum transport
spin-qubits
Superconductors
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Summary:The generation of spin‐based multi‐qubit entangled states in the presence of an electric field is one of the most challenging tasks in current quantum‐computing research. Such examples are still elusive. By using non‐equilibrium Green′s function‐based quantum‐transport calculations in combination with non‐collinear spin density functional theory, we report that an eight‐spin‐qubit entangled state can be generated with the high‐spin state of a dinuclear Fe(II) complex when the system is placed in a molecular break junction. The possible gate operation scheme, gating time, and decoherence issues have been carefully addressed. Furthermore, our calculations reveal that the preservation of the high spin state of this complex is possible if the experimentalists keep the electric‐field strength below 0.78 V nm−1. In brief, the present study offers a unique way to realize the first example of a multi‐qubit entangled state by electrical means only. Tale of entanglement: An eight‐spin‐qubit quantum entangled state can be realized in a dinuclear Fe(II) complex which (under a specific set of quantum‐logic‐gate operations) can act as a source of multi‐qubit generation. The large decoherence time with high quantum fidelity factor makes the system an efficient quantum‐computing object.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201400029