Wafer-Scale Fabrication and Room-Temperature Experiments on Graphene-Based Gates for Quantum Computation
15 Feb 2018-IEEE Transactions on Nanotechnology (Institute of Electrical and Electronics Engineers (IEEE))-Vol. 17, Iss: 2, pp 362-367
TL;DR: In this paper, the authors have fabricated at wafer-scale graphene-based configurations suitable for implementing at room temperature one-qubit quantum gates and a modified Deutsch-Jozsa algorithm.
Abstract: We have fabricated at wafer-scale graphene-based configurations suitable for implementing at room temperature one-qubit quantum gates and a modified Deutsch–Jozsa algorithm. Our measurements confirmed the (quasi-)ballistic nature of charge carrier propagation through both types of devices, which have dimensions smaller than the room-temperature mean-free-path in graphene. As such, both graphene-based configurations were found to be suitable for quantum computation. These results are encouraging for demonstrating a miniaturized, room-temperature quantum computer based on graphene.
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01 Jan 2014
TL;DR: Any remaining signal attributable to N2 fixation would imply that the ecological niche of diazotrophs in the central gyre is uncoupled from the major N loss in the OMZ, and that a substantial imbalance of the Pacific N budget has persisted over the 20th century.
Abstract: ): – requirements throughout surface waters of the N-limited North Pacific. Recent isotopic analysis of skeleton material from deep-sea corals near Hawaii also exhibit a decreasing trend over this time period, which has been interpreted as a signal of increasing N inputs from N2 fixation (36). However, because isotopic and stoichiometric signals of denitrification are transported from the anoxic zone into the subtropical gyre (37), the reported coral trends may originate partly from the OMZ. Any remaining signal attributable to N2 fixation would imply that the ecological niche of diazotrophs in the central gyre is uncoupled from the major N loss in the OMZ (38), and that a substantial imbalance of the Pacific N budget has persisted over the 20th century.
40 citations
25 citations
01 Jan 2021
TL;DR: In this article, the authors focused on nanoelectronic devices developed in the last years as the result of searching for alternative developments of the Moore's law, and dealt with ballistic devices, negative capacitance FETs, hyper-fets, tunneling devices, phase change devices, quantum dots and memories.
Abstract: This chapter is focused on nanoelectronic devices developed in the last years as the result of searching for alternative developments of the Moore’s law. We deal in this chapter with ballistic devices, negative capacitance FETs, hyper FETs, tunneling devices, phase change devices, quantum dots and memories. Many of them have in common the fact that quantum mechanics is at the foundation of their functionalities, i.e., they are quantum devices.
7 citations
TL;DR: This paper hypothesizes that the construct of the mind is the resultant of chaotic system of interacting subatomic fields driven by force fields that intersperse with the quantum vacuum; a mechanism which has not yet been fully understood.
Abstract: A ‘field’ according to quantum pilot-wave theory (Bush 2015) and quantum field theory (QFT) (Griffiths 2009) when applied to the working of the universe is a fluid that is spread across the universe with a value taken in that space which can change in time. New observations in the fields of quantum fluid mechanics, artificial intelligence (AI) and deep learning in machines are providing us novel insights into how quantum processing, memory creation and storage work using the laws that governs the quantum world and quantum field theories. Such an understanding can be extrapolated to the workings of the mind to see if similar processes underlie the functioning of living systems. This paper hypothesizes that the construct of the mind is the resultant of chaotic system of interacting subatomic fields driven by force fields that intersperse with the quantum vacuum; a mechanism which has not yet been fully understood. We propose that this integrated phenomenon also gives rise to the subtle mechanisms that help in the formation of memories and also the structures which store these memories as reservoirs. The future of our evolution is the mind which evolves in these boundless intermingling quantum fields and their force fields within the quantum vacuum. With computers getting intelligent we are instantaneously but naively evolving our minds, and in the future, working together with these intelligent machines will augment it further. In fact, the design and working of these AI systems are resultant of the proof of the intelligence of conscious mind. This way the working of mind is always superior to those of the artificial systems that emerge from it.
4 citations
Cites background from "Wafer-Scale Fabrication and Room-Te..."
...Experiments are currently being conducted by both quantum computer researchers (Dragoman and Dragoman, 2014; Steffen et al., 2011; Dragoman et al., 2018) and quantum biologists (Rieper, 2011; Salari et al., 2014; Lloyd 2011) to determine how quantum computing occurs at room temperature in relation…...
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Posted Content•
TL;DR: In this paper, a 3-port interferometer, defined by quantum point contacts in a two-dimensional electron gas, and working in the quantum Hall regime, can implement different logic gates at each port depending on the energy of charge carriers and the operating conditions.
Abstract: We show that a 3-port interferometer, defined by quantum point contacts in a two-dimensional electron gas, and working in the quantum Hall regime, can implement different logic gates at each port depending on the energy of charge carriers and the operating conditions In all cases the input logic states are encoded in the potentials applied on the quantum point contacts, while the output logic states are encoded in the values of the overall transmission coefficients at each port In addition, the output of such compact configurations can be reprogrammed by combining two 3-port interferometers
3 citations
References
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Journal Article•
441 citations
TL;DR: Experimental and theoretical progress toward quantum computation with spins in quantum dots (QDs) is reviewed, with particular focus on QDs formed in GaAs heterostructures, on nanowire-based QDs, and on self-assembled QDs.
Abstract: Experimental and theoretical progress toward quantum computation with spins in quantum dots (QDs) is reviewed, with particular focus on QDs formed in GaAs heterostructures, on nanowire-based QDs, and on self-assembled QDs. We report on a remarkable evolution of the field, where decoherence—one of the main challenges for realizing quantum computers—no longer seems to be the stumbling block it had originally been considered. General concepts, relevant quantities, and basic requirements for spin-based quantum computing are explained; opportunities and challenges of spin-orbit interaction and nuclear spins are reviewed. We discuss recent achievements, present current theoretical proposals, and make several suggestions for further experiments.
369 citations
"Wafer-Scale Fabrication and Room-Te..." refers background in this paper
...Although other solid-state technologies are presently considered for quantum computation, such as spintronics [4] based on different materials and especially on Si [5], the implemented quantum gates still work at very low temperatures....
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TL;DR: The quantum-computing start-up scene is heating up, and Google and Microsoft hope this year to perform a computation that is beyond even the most powerful 'classical' supercomputers — an elusive milestone known as quantum supremacy.
Abstract: Google, Microsoft and a host of labs and start-ups are racing to turn scientific curiosities into working machines.
117 citations
"Wafer-Scale Fabrication and Room-Te..." refers background in this paper
...QUANTUM computers are studied intensively by renowned computer companies and many research groups, and optimistic announcements about the eminence of progress from lab phase to small scale production are presented monthly in many journals and media [1]....
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01 Jan 2014
TL;DR: Any remaining signal attributable to N2 fixation would imply that the ecological niche of diazotrophs in the central gyre is uncoupled from the major N loss in the OMZ, and that a substantial imbalance of the Pacific N budget has persisted over the 20th century.
Abstract: ): – requirements throughout surface waters of the N-limited North Pacific. Recent isotopic analysis of skeleton material from deep-sea corals near Hawaii also exhibit a decreasing trend over this time period, which has been interpreted as a signal of increasing N inputs from N2 fixation (36). However, because isotopic and stoichiometric signals of denitrification are transported from the anoxic zone into the subtropical gyre (37), the reported coral trends may originate partly from the OMZ. Any remaining signal attributable to N2 fixation would imply that the ecological niche of diazotrophs in the central gyre is uncoupled from the major N loss in the OMZ (38), and that a substantial imbalance of the Pacific N budget has persisted over the 20th century.
40 citations
TL;DR: In this article, measurements and modeling of a new physical effect in graphene, which consists of oscillations in the current-voltage characteristic measured between wide contacts patterned across a graphene flake.
Abstract: We report on measurements and modeling of a new physical effect in graphene, which consists of oscillations in the current-voltage characteristic measured between wide contacts patterned across a graphene flake. The origin of this effect is the carrier transport dependence on the two spatial components of the wave vector, dependence that becomes evident for wide contacts and affects the transmission of ballistic electrons, similar to the case of non-normal incidence.
21 citations