Engineering of entanglement and spin state transfer via quantum chains of atomic spins at large separations

Бажанов, Д. И.; Sivkov, Ilia; Stepanyuk, V. S.

doi:10.1038/s41598-018-32145-3

Cited by 17 publications

(8 citation statements)

References 61 publications

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“…Similarly, entanglement improvement in quantum spin system is another crucial site of work. While there are methods of improving long-distance entanglement such as the use of quantum mediators -for example, sets of antiferromagnetically coupled spin dimers [28] -we focus on the use of control field configurations [29][30][31]. The use of control fields has a dual advantage.…”

Section: Introductionmentioning

confidence: 99%

Transforming spin chains with a continuous driving field

Soomro¹,

Chaudhry²

2021

Preprint

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A continuous, sinusoidal control field is used to suitably transform quantum spin chains. In particular, we are able to transform the quantum Ising chain to the quantum XY model, and the XY model to the XYZ spin chain. Our applied control field can also mitigate the effect of noise on the spin chain. We show how these spin chain transformations can be useful for quantum state transfer as well as entanglement generation.

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Section: Introductionmentioning

confidence: 99%

Transforming spin chains with a continuous driving field

Soomro¹,

Chaudhry²

2021

Preprint

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“…The experimental realization of spin chains is based on systems such as optical lattices, trapped ions, and solid state setups [5]. Quantum spin chains have been used to: achieve entanglement and state transfer via chains of atomic spins at large separations [6], achieve conditional state transfer which realizes a quantum spin transistor [1], engineer spin couplings in elemental superconductors [7], and realize long-distance entanglement between spins in antiferromagnetic quantum spin chains [8]. Among other things, achieving entanglement between spins is imperative when it comes to quantum information applications.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it has been shown in [15] that the natural dynamics of a single spin chain are able to sustain the generation of two pairs of Bell states, possibly shared between a sender and a receiver, which can in turn enable two-qubit teleportation. Spin chains have also been proposed to act as quantum mediators to achieve perfect long-range entanglement between remote spins on bulk and on surfaces of magnetic nanostructures [6]. Experimentally, long distance entanglement between spins in antiferromagnetic quantum spin chains has been demonstrated in [7].…”

Section: Introductionmentioning

confidence: 99%

Continuous dynamical decoupling of spin chains: Inducing two-qubit interactions to generate perfect entanglement

Irfan¹,

Hashmi²,

Zaidi³

et al. 2020

Preprint

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Efficient control over entanglement in spin chains is useful for quantum information processing applications. In this paper, we propose the use of a combination of staggered and constant configurations of strong static and oscillating fields to control and generate perfect entanglement in a spin chain. While both staggered and constant configurations of control fields decouple the chain from the environment, a constant configuration also modulates the spin chain Hamiltonian, as a result of which spins in the chain continue to interact with each other. We show that a staggered configuration suppresses the spin-spin interactions in a chain, allowing us to use a constant configuration at particular sites in order to induce two-qubit interactions. With insight from numerical simulations, we analytically show that a series of two-qubit interactions, if applied for appropriate durations in a specific sequence, can be used to perfectly entangle any two spins in the XY chain. We show numerically how the scheme can be used for models without the need to solve them analytically.

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“…It was found that the amount of fidelity is equal to 1 for a four-spin ring which denotes such a ring can provide a perfect quantum communication [4]. In addition, magnetic spin chains meet many other requirements in several inspiring technologies for the processing of quantum information [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Exact dynamics of concurrence-based entanglement in a system of four spin-1/2 particles on a triangular ladder structure

Shahsavari,

Motamedifar,

Safari

2020

Preprint

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Motivated by the ability of triangular spin ladders to implement quantum information processing, we propose a type of such systems whose Hamiltonian includes the XX Heisenberg interaction on the rungs and DzyaloshinskiiMoriya (DM) coupling over the legs. In this work, we discuss how tuning the magnetic interactions between elements of a nanomagnetic cell of a triangular ladder which contains four qubits influences on the dynamical behavior of entanglement shared between any pairs of the system. In this work, we make use of concurrence for monitoring entanglement. It is realized that the generation of quantum W states is an important feature of the present model when the system evolves unitarily with time. In general, coincidence with the emergence of W states, the concurrences of all pairs are equal to 2/N , where N is the number of system's qubits. We also obtain the precise relationship between the incidence of such states and the value of DM interaction as well as the time of entanglement transfer. Finally, by studying the two-point quantum correlations and expectation values of different spin variables, we find that xx and yy correlations bring the entanglement to a maximum value for W states, whereas for these states, zz correlation between any pairs completely quenches. Our results reveal that although Ŝz tot does not commute with the system's Hamiltonian, its expectation value remains constant during time evolution which is a generic property of quantum W states.

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Engineering of entanglement and spin state transfer via quantum chains of atomic spins at large separations

Cited by 17 publications

References 61 publications

Transforming spin chains with a continuous driving field

Transforming spin chains with a continuous driving field

Continuous dynamical decoupling of spin chains: Inducing two-qubit interactions to generate perfect entanglement

Exact dynamics of concurrence-based entanglement in a system of four spin-1/2 particles on a triangular ladder structure

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