Preparing Multipartite Entangled Spin Qubits via Pauli Spin Blockade

Abstract

Preparing large-scale multi-partite entangled states of quantum bits in each physical form such as photons, atoms or electrons for each specific application area is a fundamental issue in quantum science and technologies. Here, we propose a setup based on Pauli spin blockade (PSB) for the preparation of large-scale W states of electrons in a double quantum dot (DQD). Within the proposed scheme, two W states of n and m electrons respectively can be fused by allowing each W state to transfer a single electron to each quantum dot. The presence or absence of PSB then determines whether the two states have fused or not, leading to the creation of a W state of n + m − 2 electrons in the successful case. Contrary to previous works based on quantum dots or nitrogen-vacancy centers in diamond, our proposal does not require any photon assistance. Therefore the ‘complex’ integration and tuning of an optical cavity is not a necessary prerequisite. We also show how to improve the success rate in our setup. Because requirements are based on currently available technology and well-known sensing techniques, our scheme can directly contribute to the advances in quantum technologies and, in particular in solid state systems.

Deep Link Entropy for Quantifying Edge Significance in Social Networks

“…Moreover, considering von Neumann entropy of quantum particles, i.e., the nodes and considering the non-classical correlations between the particles as the edges, our approach can be adopted to quantum domain. In quantum networks based on multipartite entanglement, significance of edges are identical in typical states such as maximally entangled GHZ or W states [30,31]. However, for states with more than three particles, generic graph (or cluster) states emerge, enabling measurement-based one-way quantum computation [32], where groups of particles realizing the logic gates of the abstract gate-model can be considered as the communities of the network.…”

Quantum Fisher Information and Bures Distance Correlations of Coupled Two Charge-Qubits Inside a Coherent Cavity with the Intrinsic Decoherence

“…Quantum simulations are needed to manipulate the quantum information processing in various two-qubit systems such as quantum dots and quantum superconducting circuits. Some recent examples can be cited as the preparation of entanglement via Pauli-spin blockade [65], the realization of two-qubit quantum Fourier, circulant symmetry-protected entanglement [66], and the design of a scalable qubit-coupled dispersive communication architecture [43].…”

Surpassing the classical limit in magic square game with distant quantum dots coupled to optical cavities

“…The silicon-based quantum dot has been studied intensively and attracted great interest thanks to its charge offset stability and compatibility with CMOS and quantum information technology [44][45][46][47][48][49] . Hence, progressive approaches based on quantum dots have been proposed in various areas of quantum information such as preparing multipartite entanglement via Pauli spin blockade in double quantum dot system 50 , and coupling photonic and electronic qubits in microcavity systems 51,52 . What is more, coupling quantum dots to nanophotonic waveguide 53 , and optical microcavity 54 for quantum information processing have recently been experimentally demonstrated.…”