Suppression of Leakage for a Charge Qubit in Triangular Triple Quantum Dots

Xuan, Chan, Guo; Wang, Xin

doi:10.1002/qute.201900072

Cited by 8 publications

(5 citation statements)

References 31 publications

(67 reference statements)

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“…Lastly, we should also mention that by choosing the state and the physical parameters properly, the dephasing can be largely suppressed in a quantum-dot array [28], [30], [44], [49]. Therefore, we can conclude that the relatively short decoherence time is not expected to prohibit the application of charge qubits for quantum computing.…”

Section: Decoherence and Fidelity Of Charge Qubitsmentioning

confidence: 95%

“…Our research is motivated by recent, significant efforts made to advance quantum qubits and quantum gates implemented in semiconductor and, in particular, CMOS technologies, with a number of very recent studies reporting silicon quantum dots [19]- [21], [28]- [30] and support electronics [16], [31]- [37]. These studies demonstrate a more practical view on quantum computing, highlighting the feasibility of large-scale fully integrated quantum processors, where many qubits will be controlled by the means of conventional electronic circuitry.…”

Section: Introductionmentioning

confidence: 99%

“…Charge qubits in van der Waals heterostructures are discussed in [48]. Relevant to charge qubits, an electron localization due to Coulomb repulsion is investigated along with the time evolution of quantum states in the presence of charge noise [28], [30], [45], [46], [49].…”

Section: Introductionmentioning

confidence: 99%

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CMOS Position-Based Charge Qubits: Theoretical Analysis of Control and Entanglement

et al. 2020

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In this study, a formal definition, robustness analysis and discussion on the control of a position-based semiconductor charge qubit are presented. Such a qubit can be realized in a chain of coupled quantum dots, forming a register of charge-coupled transistor-like devices, and is intended for CMOS implementation in scalable quantum computers. We discuss the construction and operation of this qubit, its Bloch sphere, and relation with maximally localized Wannier functions which define its positionbased nature. We then demonstrate how to build a tight-binding model of single and multiple interacting qubits from first principles of the Schrödinger formalism. We provide all required formulae to calculate the maximally localized functions and the entries of the Hamiltonian matrix in the presence of interaction between qubits. We use three illustrative examples to demonstrate the electrostatic interaction of electrons and discuss how to build a model for many-electron (qubit) system. To conclude this study, we show that charge qubits can be entangled through electrostatic interaction.INDEX TERMS CMOS technology, charge qubit, position-based qubit, electrostatically controlled qubit, single-electron devices, tight-binding formalism, Schrödinger formalism, entanglement, entanglement entropy, Bloch sphere.2

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Section: Decoherence and Fidelity Of Charge Qubitsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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CMOS Position-Based Charge Qubits: Theoretical Analysis of Control and Entanglement

et al. 2020

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“…The role of a QD is to create a spatial confinement for electrons or holes using an electric field arising either from material interfaces or by applying a confining electric potential. Semiconductor QDs have been known for about two decades [12], [14]- [20]. Key reason that makes semiconductor QDs very attractive in the context of circuit design is that they can be now implemented using Complementary Metal-Oxide-Semiconductor (CMOS) or foundry fabricated technologies [21]- [24] since the quality and reliability of commercial processes have dramatically increased [25].…”

Section: Introductionmentioning

confidence: 99%

Towards the Co-Simulation of Charge Qubits: A Methodology Grounding on an Equivalent Circuit Representation

Blokhina

Sokolov

Giounanlis³

et al. 2021

IEEE Open J. Circuits Syst.

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“…superconducting qubits [32,[62][63][64], photons [65,66], or quantum dots [67][68][69]. At the level of QEC codes, there are protocols [70,71] to correct for the erasure channel, an error model where the position of the lost qubits is known.…”

Section: Introductionmentioning

confidence: 99%

Characterization and implementation of robust quantum information processing

Amaro¹

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Quantum information processing has practical applications like exponential speed ups in optimisation problems or the simulation of complex quantum systems. However, well controlled quantum systems realised experimentally to process the information are sensitive to noise. The progress in leading experimental platforms like superconducting qubits or trapped ions has al-lowed the realisation of high-fidelity quantum processors known as Noisy Intermediate-Scale Quantum (NISQ) devices with roughly 50 qubits. NISQ devices are meant to be large enough to show, despite their imperfections, an advantage over classical processors in some computational tasks and pro-vide a rich playground to prove principles for future quantum algorithms and protocols. However, quantum processors need to be scaled up to imple-ment quantum algorithms that are relevant for practical applications. For this purpose, Quantum Error Correction (QEC) codes, which encode the information in multi-partite quantum states that are generally highly en-tangled, become crucial to eliminate the errors introduced by noise sources like qubit loss. Here we introduce a protocol to correct qubit loss, i.e., the impossibility to access the information encoded in a qubit, in the color code, a leading candidate for fault-tolerant quantum computation. We show that the achieved tolerance of 46(1)% to qubit loss is related to a novel percola-tion problem on three coupled lattices. Our work shows the high robustness of the color under our protocol and has practical importance for implemen-tations of fault-tolerant QEC. In our second line of research we propose and analyse local entanglement witnesses as efficient and platform-agnostic detectors of the entanglement between qubit subsystems, providing a de-scription of the entanglement structure in, in principle, arbitrarily large quantum systems. Since entanglement is a genuinely quantum property used as a resource in most quantum algorithms, local witnesses, which can be implemented with current technology, are of interest for current and future quantum processors.

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Suppression of Leakage for a Charge Qubit in Triangular Triple Quantum Dots

Cited by 8 publications

References 31 publications

CMOS Position-Based Charge Qubits: Theoretical Analysis of Control and Entanglement

CMOS Position-Based Charge Qubits: Theoretical Analysis of Control and Entanglement

Towards the Co-Simulation of Charge Qubits: A Methodology Grounding on an Equivalent Circuit Representation

Characterization and implementation of robust quantum information processing

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