Electric-Field Inputs for Molecular Quantum-Dot Cellular Automata Circuits

Blair, Enrique P.

doi:10.1109/tnano.2019.2910823

Cited by 26 publications

(23 citation statements)

References 35 publications

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“…In fact, a molecule is polarised when embedded in an electric field, which can be generated by an external electrode, i.e. a driver or clock system [22,23], or other molecule charge distributions, i.e. in the information propagation mechanism.…”

Section: A Mosquito Methodologymentioning

confidence: 99%

Ab initio Molecular Dynamics Simulations of Field-Coupled Nanocomputing Molecules

Ardesi

Gaeta

Beretta

et al. 2021

JICS

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Molecular Field-Coupled Nanocomputing (FCN) represents one of the most promising solutions to overcome the issues introduced by CMOS scaling. It encodes the information in the molecule charge distribution and propagates it through electrostatic intermolecular interaction. The need for charge transport is overcome, hugely reducing power dissipation.At the current state-of-the-art, the analysis of molecular FCN is mostly based on quantum mechanics techniques, or ab initio evaluated transcharacteristics. In all the cases, studies mainly consider the position of charges/atoms to be fixed. In a realistic situation, the position of atoms, thus the geometry, is subjected to molecular vibrations. In this work, we analyse the impact of molecular vibrations on the charge distribution of the 1,4-diallyl butane. We employ Ab Initio Molecular Dynamics to provide qualitative and quantitative results which describe the effects of temperature and electric fields on molecule charge distribution, taking into account the effects of molecular vibrations. The molecules are studied at near-absolute zero, cryogenic and ambient temperature conditions, showing promising results which proceed towards the assessment of the molecular FCN technology as a possible candidate for future low-power digital electronics. From a modelling perspective, the diallyl butane demonstrates good robustness against molecular vibrations, further confirming the possibility to use static transcharacteristics to analyse molecular circuits.

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Section: A Mosquito Methodologymentioning

confidence: 99%

Ab initio Molecular Dynamics Simulations of Field-Coupled Nanocomputing Molecules

Ardesi

Gaeta

Beretta

et al. 2021

JICS

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“…In one system we proposed for biasing a molecular DQD using an applied electric field [14], the detuning is…”

Section: A Molecular Quantum Dot Systemsmentioning

confidence: 99%

“…Thus, tuning ∆ is a matter of adjusting the strength of the applied E. In Ref. [14], the field is applied using charged electrodes, so the field strength may be changed by varying the voltage V applied between the electrodes. For a DQD based on an ionic DFA molecule, a = 0.67 nm, and it has been calculated that the relaxation time is T 1 ∼ 1 ps and the tunneling energy is γ ∼ 50 meV [15].…”

Section: A Molecular Quantum Dot Systemsmentioning

confidence: 99%

Tunable, Hardware-Based Quantum Random Number Generation Using Coupled Quantum Dots

McCabe

Koziol

Snider

et al. 2020

IEEE Trans. Nanotechnology

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Random numbers are a valuable commodity in gaming and gambling, simulation, conventional and quantum cryptography, and in non-conventional computing schemes such as stochastic computing. We propose to generate a random bit using a position measurement of a single mobile charge on a coupled pair of quantum dots. True randomness of the measurement outcome is-depending on implementation-provided by statistical mechanics, or by quantum mechanics via Born's rule. A random bit string may be generated using a sequence of repeated measurements on the same double quantum dot (DQD) system. Any bias toward a "0" measurement or a "1" measurement may be removed or tuned as desired simply by adjusting the bias between the dots. Device tunability provides versatility, enabling this quantum random number generator (QRNG) to support applications in which no bias is desired, or where a tunable bias is desired. We discuss a metal-dot implementation as well as a molecular implementation of this QRNG. Basic quantum mechanical principles are used to study power dissipation and timing considerations for the generation of random bit strings. The DQD offers a small form factor and, in a metallic implementation, is usable in the case where cryogenic operations are desirable (as in the case of quantum computing). For room-temperature applications, a molecular DQD may be used.Index Terms-Quantum random number generator, quantum dots.

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“…One challenge in molecular QCA is the write-in of classical bits on nano-scale molecules. While some techniques have been proposed for bit-write-in to molecular QCA circuits [6], [7], we have proposed a technique that requires neither special fixed-state QCA molecules nor electrodes with singlemolecule specificity [8]. Quantum models of asynchronous QCA circuits were used to demonstrate that charged electrodes much larger than the molecules could be used to apply an input electric field to the molecular circuitry and write bits onto several molecules.…”

Section: Introductionmentioning

confidence: 99%

Robust Electric-field Input Circuits for Clocked Molecular Quantum-dot Cellular Automata

Cong,

Blair

2021

Preprint

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Quantum-dot cellular automata (QCA) is a paradigm for low-power, general-purpose, classical computing designed to overcome the challenges facing CMOS in the extreme limits of scaling. A molecular implementation of QCA offers nanometer-scale devices with device densities and operating speeds which may surpass CMOS device densities and speeds by several orders of magnitude, all at room temperature. Here, a proposal for electric field bit write-in to molecular QCA circuits is extended to synchronous QCA circuits clocked using an applied electric field, E. Input electrodes, which may be much larger than the cells themselves, immerse an input circuit in an input field Ey ŷ, in addition to the applied clocking field Ez ẑ. The input field selects the input bit on a field-sensitive portion of the circuit. Another portion of the circuit with reduced Eysensitivity functions as a shift register, transmitting the input bit to downstream QCA logic for processing. It is shown that a simple rotation of the molecules comprising the shift register makes them immune to unwanted effects from the input field or fringing fields in the direction of the input field. Furthermore, the circuits also tolerate a significant unwanted field component Ex x in the third direction, which is neither the clocking nor input direction. The write-in of classical bits to molecular QCA circuits is a road-block that must be cleared in order to realize energy-efficient molecular computation using QCA. The results presented here show that interconnecting shift registers may be designed to function in the presence of significant unwanted fringing fields from large input electrodes. Furthermore, the techniques devloped here may also enable molecular QCA logic to tolerate these same unwanted fringing fields.

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Electric-Field Inputs for Molecular Quantum-Dot Cellular Automata Circuits

Cited by 26 publications

References 35 publications

Ab initio Molecular Dynamics Simulations of Field-Coupled Nanocomputing Molecules

Ab initio Molecular Dynamics Simulations of Field-Coupled Nanocomputing Molecules

Tunable, Hardware-Based Quantum Random Number Generation Using Coupled Quantum Dots

Robust Electric-field Input Circuits for Clocked Molecular Quantum-dot Cellular Automata

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