Design and Characterization of MEMS Micromirrors for Ion-Trap Quantum Computation

Kim, Changsoon; Knoernschild, Caleb; Liu, Bin; Kim, Jungsang

doi:10.1109/jstqe.2007.893561

Cited by 21 publications

(20 citation statements)

References 27 publications

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“…Entanglement between non-local registers can be generated probabilistically [3,31,32]. Devices of optical micro-eletro-mechanical systems (MEMS) [38] can efficiently route photons and couple arbitrary pair of registers. Detector array can simultaneously generate entanglement for many pairs of registers.…”

Section: Quantum Register and Experimental Implementationsmentioning

confidence: 99%

Distributed quantum computation based on small quantum registers

et al. 2007

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We describe and analyze an efficient register-based hybrid quantum computation scheme. Our scheme is based on probabilistic, heralded optical connection among local five-qubit quantum registers. We assume high fidelity local unitary operations within each register, but the error probability for initialization, measurement, and entanglement generation can be very high (∼ 5%). We demonstrate that with a reasonable time overhead our scheme can achieve deterministic non-local coupling gates between arbitrary two registers with very high fidelity, limited only by the imperfections from the local unitary operation. We estimate the clock cycle and the effective error probability for implementation of quantum registers with ion-traps or nitrogen-vacancy (NV) centers. Our new scheme capitalizes on a new efficient two-level pumping scheme that in principle can create Bell pairs with arbitrarily high fidelity. We introduce a Markov chain model to study the stochastic process of entanglement pumping and map it to a deterministic process. Finally we discuss requirements for achieving fault-tolerant operation with our register-based hybrid scheme, and also present an alternative approach to fault-tolerant preparation of GHZ states.

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Section: Quantum Register and Experimental Implementationsmentioning

confidence: 99%

Distributed quantum computation based on small quantum registers

et al. 2007

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“…The mirror design consists of a circular mirror plate rotating about 2 torsional springs (Fig. 2) [16]. Tilt is induced by electrostatic actuation from a voltage applied between the grounded mirror plate and underlying electrodes.…”

Section: Mems Mirrorsmentioning

confidence: 99%

“…In order to achieve the targeted transition speed, the settling time of the mirror's step response is minimized by increasing ω R while maintaining near critical damping. Maximizing beam steering speed while meeting system requirements is a complex optimization process [16] due to physical limitations on available torsional stiffness κ and control voltage [17] as well as the strong dependence of the damping ratio ζ on the mirror radius and the air gap under the mirror plate. We have found that mirrors with a radius close to 75 µm and a gap of 1.25 µm give the best compromise of resonant frequency and proper damping.…”

Section: Mems Mirrorsmentioning

confidence: 99%

“…The second ("tilt" case) is the case when the applied voltage steps up in magnitude causing the mirror to increase the tilt angle. The mirror's transient response differs in these two cases due to electrostatic softening [16], resulting in a faster response for the "release" case. By designing the mirrors to be slightly underdamped for the "release" case, one can achieve optimal settling times for both cases.…”

Section: System Performancementioning

confidence: 99%

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Multiplexed broadband beam steering system utilizing high speed MEMS mirrors

Knoernschild¹,

Kim²,

Lu³

et al. 2009

Opt. Express

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Abstract:We present a beam steering system based on microelectromechanical systems technology that features high speed steering of multiple laser beams over a broad wavelength range. By utilizing high speed micromirrors with a broadband metallic coating, our system has the flexibility to simultaneously incorporate a wide range of wavelengths and multiple beams. We demonstrate reconfiguration of two independent beams at different wavelengths (780 and 635 nm) across a common 5×5 array with 4 µs settling time. Full simulation of the optical system provides insights on the scalability of the system. Such a system can provide a versatile tool for applications where fast laser multiplexing is necessary. References and links

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“…Entanglement between remote registers can be generated probabilistically [22,29]. Optical MEMS devices [30] can efficiently route photons and couple arbitrary pair of registers. Detector array can simultaneously generate entanglement for many pairs of registers.…”

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confidence: 99%

Scalable Quantum Networks Based on Few-Qubit Registers

Jiang

Sørensen

Lukin

2010

Int. J. Quantum Inform.

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We describe and analyze a hybrid approach to scalable quantum computation based on an optically connected network of few-qubit quantum registers. We show that probabilistically connected fivequbit quantum registers suffice for deterministic, fault-tolerant quantum computation even when state preparation, measurement, and entanglement generation all have substantial errors. We discuss requirements for achieving fault-tolerant operation for two specific implementations of our approach.The key challenge in experimental quantum information science is to identify isolated quantum mechanical systems with good coherence properties that can be manipulated and coupled together in a scalable fashion. Substantial progress has been made towards the physical implementation of few-qubit quantum registers using systems of coupled trapped ions [1,2,3,4], superconducting islands [5,6], solid-state qubits based on electronic spins in semiconductors [7], and color centers in diamond [8,9,10,11]. While the precise manipulation of large, multi-qubit systems still remains an outstanding challenge, approaches for connecting such few qubit registers into large scale circuits are currently being explored both theoretically [12,13,14,15,16,17] and experimentally [18,19]. Of specific importance are approaches which can yield fault-tolerant operations with minimal resources and realistic (high) error rates.In Ref.[13] a novel technique to scalable quantum computation was suggested, where high fidelity local operations can be used to correct low fidelity non-local operations, using techniques that are currently being explored for quantum communication [20,21,22]. In this Letter, we present a hybrid approach, which requires only 5 (or fewer)-qubit registers with local determinstic coupling, while providing additional improvements over the earlier protocol [13]: reduced measurement errors, higher fidelity, and more efficient entanglement purification. The small registers are connected by optical photons, which enables non-local coupling gates and reduces the requirement for fault tolerant quantum computation [23]. Specifically, we analyze two physical systems where this approach is very effective. We consider an architecture where pairwise non-local entanglement can be created in parallel, as indicated in Fig. 1. This is achieved via simultaneous optical excitation of the selected register pairs followed by photon-detection in specific channel. We use a Markov chain analysis to estimate the overhead in time and operational errors, and discuss the feasibility of large scale, fault-tolerant quantum computation using this approach.The present work is motivated by experimental advances in two specific physical systems. Recent experiments have demonstrated quantum registers composed of few trapped ions, which can support high-fidelity local operations [2,3,4]. The ion qubits can couple to light efficiently [24] and were recognized early for their potential in an optically coupled component [13,14]. Probabilistic entanglement of remote ion qubits m...

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Design and Characterization of MEMS Micromirrors for Ion-Trap Quantum Computation

Cited by 21 publications

References 27 publications

Distributed quantum computation based on small quantum registers

Distributed quantum computation based on small quantum registers

Multiplexed broadband beam steering system utilizing high speed MEMS mirrors

Scalable Quantum Networks Based on Few-Qubit Registers

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