IBM POWER9 processor core

Le, H. Q.; Norstrand, J. A. Van; Thompto, Brian W.; Moreira, José E.; Nguyen, D. Q.; Hrusecky, D.; Genden, M.; Kroener, M.

doi:10.1147/jrd.2018.2854039

Cited by 16 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such electron at time t in is described by a single particle quantum state |ψ 1 (t in ) where the superindex 1 refers to this first electron. We are measuring the current through a single particle operatorÎ 1 . If the state |ψ 1 (t in ) is not an eigenstate of the operatorÎ, then, the measurement of the I gives rise to the quantum noise discussed in the previous subsection (we notice again that the generalization to more electrons is done in Appendix A).…”

Section: The Solutionmentioning

confidence: 99%

“…The result σ I T = 0 in Equation (6) implies that the distribution of I T is a delta function around Î 1 . This implies that in every measurement one gets the mean value of the single particle average current I T = I 1 .…”

Section: The Solutionmentioning

confidence: 99%

“…The first step is identifying the proper single particle operatorÎ 1 . Then, once we identifyÎ 1 , we can compute the eigenstates |ψ 1 (t in ) and the eigenvalues I 1 that will correspond to the measured output results.…”

Section: Appendix C Description Of the Current Signal And Conditionmentioning

confidence: 99%

“…At present, the field effect transistor is still the most efficient device to perform classical computations. The electronic industry is able to fit 10 10 transistors all together in a single chip, working at frequencies of a few GHz [1]. State-of-the-art transistors, with nanoscale dimensions, are quantum devices in the sense that their ability to convert the input into output information is based on quantum laws governing electron transport [2].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Proposal for Evading the Measurement Uncertainty in Classical and Quantum Computing: Application to a Resonant Tunneling Diode and a Mach-Zehnder Interferometer

et al. 2019

View full text Add to dashboard Cite

Measuring properties of quantum systems is governed by a stochastic (collapse or state-reduction) law that unavoidably yields an uncertainty (variance) associated with the corresponding mean values. This non-classical source of uncertainty is known to be manifested as noise in the electrical current of nanoscale electron devices, and hence it can flaw the good performance of more complex quantum gates. We propose a protocol to alleviate this quantum uncertainty that consists of (i) redesigning the device to accommodate a large number of electrons inside the active region, either by enlarging the lateral or longitudinal areas of the device and (ii) re-normalizing the total current to the number of electrons. How the above two steps can be accommodated using the present semiconductor technology has been discussed and numerically studied for a resonant tunneling diode and a Mach-Zehnder interferometer, for classical and quantum computations, respectively. It is shown that the resulting protocol formally resembles the so-called collective measurements, although, its practical implementation is substantially different.

show abstract

Section: The Solutionmentioning

confidence: 99%

Section: The Solutionmentioning

confidence: 99%

Section: Appendix C Description Of the Current Signal And Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Proposal for Evading the Measurement Uncertainty in Classical and Quantum Computing: Application to a Resonant Tunneling Diode and a Mach-Zehnder Interferometer

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Note that this comparison is somewhat unfair as making a monolithic FC is perhaps far more challenging beyond a certain scale than linking together two largely independent HCs. However, making such a wider core to enhance single-thread performance has been one (if not the) chosen route for industry [66]. A simple DLA system is not yet a clear winner in performance.…”

Section: Overall Benetsmentioning

confidence: 99%

Bootstrapping

Kondguli

Huang

2019

Proceedings of the Twenty-Fourth International Conference on Architectural Support for Programming Languages and Operating Syst

View full text Add to dashboard Cite

Single-thread performance improvement remains a central design goal for general purpose processors. Microarchitectural designs for the core have reached a plateau over the past years. However, we are still far from exhausting the implicit parallelism available in today's programs. One approach is to use a separate thread context to improve data and instruction supply to the main pipeline. Such decoupled look-ahead (DLA) architectures have been shown to be an eective way to improve single-thread performance. However, a default implementation requires an additional core. While an SMT avor is possible, a naive implementation is inecient and thus slow. In this paper, we propose an optimized implementation called Bootstrapping that makes DLA just as eective on a single (SMT) core as using two cores. While fusing two cores can improve single-thread performance by 1.22x, Bootstrapping provides a speedup of 1.48 over a broad range of benchmark suites, making it a compelling microarchitectural feature for general-purpose microarchitectures. CCS Concepts • Computer systems organization → Architectures; Pipeline computing; Multicore architectures.

show abstract