Scalable Neutral Atom Quantum Computer with Interaction on Demand

Nakahara, Mikio; Lapasar, Elham Hosseini; Kasamatsu, Kenichi; Ohmi, Tetsuo; Kondo, Yasushi

doi:10.48550/arxiv.1009.4426

Cited by 2 publications

(4 citation statements)

References 7 publications

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“…Furthermore, local traps have been proposed for individual atoms using Near Field Fresnel Diffraction (NFFD) light [22]. A new approach for scalable quantum computation has been suggested [23] through a combination of local NFFD traps, for qubits, and an empty optical lattice, for mediating interaction between them. Since the interaction is achieved through controlled collisions between delocalized atoms it may suffer a high decoherence when qubits, on which the gate is applied, are far apart [15].…”

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confidence: 99%

“…2(a) we show a single atom confined in a NFFD trap. The position of the minimum of the trapping potential is controlled by varying the aperture radius [22] through micro electro mechanical system technology, as proposed in [23].…”

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confidence: 99%

“…Local unitary operation on each qubit may be applied through an extra fiber, along with the NFFD trapping fiber [23], as show in Fig. 2(a).…”

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confidence: 99%

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Nonperturbative Entangling Gates between Distant Qubits Using Uniform Cold Atom Chains

et al. 2011

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We propose a new fast scalable method for achieving a two-qubit entangling gate between arbitrary distant qubits in a network by exploiting dispersionless propagation in uniform chains. This is achieved dynamically by switching on a strong interaction between the qubits and a bus formed by a non-engineered chain of interacting qubits. The quality of the gate scales very efficiently with qubit separations. Surprisingly, a sudden switching of the coupling is not necessary and our gate mechanism is not altered by a possibly gradual switching. The bus is also naturally reset to its initial state making the complex resetting procedure unnecessary after each application of the gate. Moreover, we propose a possible experimental realization in cold atoms trapped in optical lattices and near field Fresnel trapping potentials, which are both accessible to current technology.Introduction:-Universal quantum computation can be achieved by arbitrary local operations on single qubit and one two-qubit entangling gate [1]. While single qubit operations are easily achieved by local actions, the story is very different for the two qubit gate. In an array of spins an entangling gate between neighboring qubits can be accomplished by letting them interact. However, for non-neighboring qubits, a direct interaction is normally not possible unless there is a separate common bus mode [2] or flying qubits. In realizations without an additional bus mode, such as with cold atoms in optical lattices, one cannot choose an arbitrary pair of atomic qubits for a gate operation and usually gates parallely occur between all neighboring pairs [3]. Thus, designing bus modes for logic gates between arbitrary and distant pairs of qubits is of utmost importance in any physical realizations and various unconventional examples of buses are continuously being proposed [4,5]. One possible realization is to have both the qubits and the bus composed of the same physical objects, generally called spin chains. The quality of an unmodulated spin chain, even as a data-bus, is affected by dispersion [6]. Thus, in order to have a quantum gate between two qubits through such buses [5,[7][8][9], delocalized encodings over several spins [10], delicately engineered couplings [11] or very weak couplings between qubits and the bus [5] is thought to be necessary. Recently, a new scheme based on tuning the couplings between qubits and the bus has been proposed [12] for fast and highquality state transmission, which we here exploit for achieving an entangling quantum gate between arbitrarily distant qubits.

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Nonperturbative Entangling Gates between Distant Qubits Using Uniform Cold Atom Chains

et al. 2011

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“…One may also worry about different raising times of the atoms from local traps and loading them into the optical lattice. This is not a big issue at all as the process of rasing the atoms and loading them to the optical lattice is an adiabatic process and should be accomplished very slowly [35]. So, one can control the speed of this process in such a way that both atoms fully load to the optical lattice before starting their transmission.…”

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Long distance entanglement generation through coherent directed transport of Neutral atoms in unmodulated optical lattices

Rafiee¹,

Bayat²

2011

Preprint

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We introduce a fully coherent way for directed transport of localized atoms in optical lattices by regularly performing phase shifts on the lattice potential during the free evolution of the system. This paves the way for realizing a possible cold atom quantum computer in which entangling gates operate by bringing two individual atoms in the proximity of each other and letting them to interact. The speed of our protocol is determined by the tunneling amplitudes of the atoms and thus is much faster than the speed of the dynamics resulted from superexchange interaction in spin chains. Our scheme is robust against possible imperfections and perhaps its main advantage is its simplicity where all of its requirements have been already achieved in recent experiments.

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Scalable Neutral Atom Quantum Computer with Interaction on Demand

Cited by 2 publications

References 7 publications

Nonperturbative Entangling Gates between Distant Qubits Using Uniform Cold Atom Chains

Nonperturbative Entangling Gates between Distant Qubits Using Uniform Cold Atom Chains

Long distance entanglement generation through coherent directed transport of Neutral atoms in unmodulated optical lattices

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