Magnetic interaction in diluted N@C[sub 60]

Waiblinger, M.; Goedde, Burkart; Lips, K.; Harneit, Wolfgang; Jakes, Peter; Weidinger, A.; Dinse, Klaus−Peter

doi:10.1063/1.1342498

Cited by 5 publications

(2 citation statements)

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“…The C60's Faraday cage does not restrict magnetic interactions and neighboring endohedrals experience a significant magnetic dipole coupling, H D ∼J(1−3 cos 2 θ)[3Î zŜz −Î·Ŝ] ∼ J DÎzŜz , in the weak coupling limit. The strength of this dipolar coupling has been estimated to be J D ∼ 50MHz(1/r 3 ), where r is the separation between the neighboring trapped atoms in the endohedrals measured in nanometers [22], and θ is the angle between r and the external B field. The Hyperfine coupling constants for 15 N@C60, 31 P@C60 have been measured [23], and are given in Table I.…”

Section: Group V Endohedralsmentioning

confidence: 99%

Quantum-cellular-automata quantum computing with endohedral fullerenes

2003

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We present a scheme to perform universal quantum computation using global addressing techniques as applied to a physical system of endohedrally doped fullerenes. The system consists of an ABAB linear array of Group V endohedrally doped fullerenes. Each molecule spin site consists of a nuclear spin coupled via a Hyperfine interaction to an electron spin. The electron spin of each molecule is in a quartet ground state S = 3/2. Neighboring molecular electron spins are coupled via a magnetic dipole interaction. We find that an all-electron construction of a quantum cellular automata is frustrated due to the degeneracy of the electronic transitions. However, we can construct a quantum cellular automata quantum computing architecture using these molecules by encoding the quantum information on the nuclear spins while using the electron spins as a local bus. We deduce the NMR and ESR pulses required to execute the basic cellular automata operation and obtain a rough figure of merit for the the number of gate operations per decoherence time. We find that this figure of merit compares well with other physical quantum computer proposals. We argue that the proposed architecture meets well the first four DiVincenzo criteria and we outline various routes towards meeting the fifth criteria: qubit readout.

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Section: Group V Endohedralsmentioning

confidence: 99%

Quantum-cellular-automata quantum computing with endohedral fullerenes

2003

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“…Experimental studies on the concentration dependence of ESR line broadening 42 and theoretical calculations 30 show that the exchange interaction between two endohedrals is negligible, leaving magnetic dipole interaction as the only strong coupling. For two adjacent endohedrals at a typical 43 center-to-center distance of 1.0 nm the magnetic dipole interaction between electron spins can be as large as ~ 50 MHz.…”

Section: Spin-spin Interactions and The Linear Qubit Registermentioning

confidence: 99%

Spin Quantum Computing with Endohedral Fullerenes

Harneit

2017

Nanostructure Science and Technology

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Architectures for a Spin Quantum Computer Based on Endohedral Fullerenes

Harneit

Meyer

Weidinger

et al. 2002

phys. stat. sol. (b)

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We present a discussion of recent concepts for the construction of a spin quantum computer using endohedral fullerenes. The fullerene molecule is a static, room-temperature trap for atoms with slowly relaxing electron and nuclear spins. The fullerene "containers" can be used to arrange the spins in complex structures such as a linear chain, to form a spin quantum register. We discuss the probable properties of such registers and different strategies to use them in a quantum computer design, including gating and read-out methods.1. Introduction Quantum computation using nuclear spins has been demonstrated in a variety of experiments [1, 2] but is believed to be limited to a small number of qubits [3]. Proposals for realistic spin quantum computer architectures have to address the question of scalability [4]. There are two widely cited concepts fulfilling this criterion, by Kane [5] and by Loss and DiVincenzo [6]. Both concepts are based on electric-field controlled exchange interaction between electron spins, which might however be very difficult [7].Recently, Harneit [8], Suter and Lim [9], and Twamley [10] presented concepts for quantum computation using endohedral fullerenes as spin-qubits, and a microwavepulse controlled magnetic dipolar interaction between qubits. A symbolic drawing synthesizing these concepts is shown in Fig. 1. In this paper, we present the current knowledge about the qubits in question, and we discuss the proposed operational schemes and computer architectures that might be scalable.

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Magnetic interaction in diluted N@C[sub 60]

Cited by 5 publications

References 0 publications

Quantum-cellular-automata quantum computing with endohedral fullerenes

Quantum-cellular-automata quantum computing with endohedral fullerenes

Spin Quantum Computing with Endohedral Fullerenes

Architectures for a Spin Quantum Computer Based on Endohedral Fullerenes

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