State tomography of a chain of qubits embedded in a spin field-effect transistor via repeated spin-blockade measurements on the edge qubit

Yuasa, Kazuya; Okano, Keisuke; Nakazato, Hiromichi; Kashiwada, Saori; Yoh, Kanji

doi:10.1103/physrevb.79.075318

Cited by 4 publications

(7 citation statements)

References 27 publications

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“…5 The state tomography of qubits was discussed in Ref. 7. In this paper, we show that a controlled-not (cnot) operation and a characterization of the operation by a quantum process tomography 8,9 are also available in this system.…”

Section: Introductionmentioning

confidence: 70%

“…A state tomography scheme for the system described above is proposed in Ref. 7. For this system the state of the edge qubit can be measured repeatedly but the state of the other qubit than the edge qubit cannot be measured directly.…”

Section: Process Tomography Of Cnot Gatementioning

confidence: 99%

“…Furthermore the vertically stacked quantum dot system has higher scalability than the two dimensional electron gas system. We have proposed and investigated, [5][6][7] from both experimental and theoretical aspects, a system of vertically stacked selfassembled InAs dots buried in AlInAs barrier layer adjacent to the channel of a spin field-effect transistor (FET).…”

Section: Introductionmentioning

confidence: 99%

“…In the proposed setup [5][6][7] illustrated in Fig. 1, each qubit evolves under the interactions with the neighboring qubits and would be rotated via electric spin resonance (ESR).…”

Section: Introductionmentioning

confidence: 99%

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A controlled-NOT gate in a chain of qubits embedded in a spin field-effect transistor and its process tomography

Unoki¹,

Nakazato²,

Yuasa³

et al. 2013

Eur. Phys. J. B

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We have investigated the realizability of the controlled-not (cnot) gate and characterized the gate operation by quantum process tomography for a chain of qubits, realized by electrons confined in self-assembled quantum dots embedded in the spin field-effect transistor. We have shown that the cnot gate operation and its process tomography are performable by using the spin exchange interaction and several local qubit rotations within the coherence time of qubits. Moreover it is shown that when the fluctuation of operation time and the imperfection of polarization of channel electrons are considered as sources of decay of fidelity, at most only 5% decrease of the cnot process fidelity is expected by the fluctuation of the operation time and its values as high as 0.49 and 0.72 are obtained for the channel spin polarizations of 0.6 and 0.8, respectively.

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Section: Introductionmentioning

confidence: 70%

Section: Process Tomography Of Cnot Gatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In the proposed setup [5][6][7] illustrated in Fig. 1, each qubit evolves under the interactions with the neighboring qubits and would be rotated via electric spin resonance (ESR).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A controlled-NOT gate in a chain of qubits embedded in a spin field-effect transistor and its process tomography

Unoki¹,

Nakazato²,

Yuasa³

et al. 2013

Eur. Phys. J. B

Self Cite

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show abstract

“…Such situations, in which only a subsystem is accessible, arise for example in networks of 'dark spins' in diamond and solid state quantum devices [12,13,14] as well as spin networks in NMR and ESR setups [1,4,15].…”

mentioning

confidence: 99%

Gateway Schemes of Quantum Control for Spin Networks

Maruyama

Burgarth²

2016

Electron Spin Resonance (ESR) Based Quantum Computing

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Towards the full-fledged quantum computing, what do we need? Obviously, the first thing we need is a (many-body) quantum system, which is reasonably isolated from its environment in order to reduce the unwanted effect of noise, and the second might be a good technique to fully control it. Although we would also need a welldesigned quantum code for information processing for fault-tolerant computation, from a physical point of view, the primary requisites are a system and a full control for it. Designing and fabricating a controllable quantum system is a hard work in the first place, however, we shall focus on the subsequent steps that cannot be skipped and are highly nontrivial.Typically, when attempting to control a many-body quantum system, every subsystem of it has to be a subject of accurate and individual access to apply operations and to perform measurements. Such a (near-) full accessibility leads to a problem of not only technical difficulties, but also noise (decoherence), as the system can readily interact with its surrounding environment. In a sense, we are wishing for two inconsistent demands, namely, being able to manipulate a quantum system fully by controlling the field parameters while suppressing its interaction with the field.

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Fabrication of a self-aligned cross-wire quantum-dot chain light emitting diode by molecular beam epitaxial regrowth

Ikpi¹,

Atkinson²,

Bremner³

et al. 2012

Nanotechnology

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The fabrication of a cross-wire p-i-n light emitting diode (LED) by molecular beam epitaxial overgrowth on mesa-patterned GaAs(100) substrates is presented. Micron-wide mesa stripes fabricated by standard photolithography are subsequently narrowed to sub-micron dimensions by GaAs overgrowth due to net migration towards the mesa top. Chains of InAs quantum dots (QDs) can then be grown in a self-aligned manner on top of the narrow GaAs ridge mesa, forming the active region of the QD-chain LED. The kinetics of the overgrowth is discussed and the electroluminescence operation of the LED is presented.

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State tomography of a chain of qubits embedded in a spin field-effect transistor via repeated spin-blockade measurements on the edge qubit

Cited by 4 publications

References 27 publications

A controlled-NOT gate in a chain of qubits embedded in a spin field-effect transistor and its process tomography

A controlled-NOT gate in a chain of qubits embedded in a spin field-effect transistor and its process tomography

Gateway Schemes of Quantum Control for Spin Networks

Fabrication of a self-aligned cross-wire quantum-dot chain light emitting diode by molecular beam epitaxial regrowth

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