Optical
nonlinearities can be engineered into high-speed optical
gates when a probe signal is switched coherently and fast by an optical
control pulse through various nonlinear effects for switching. In
semiconductors, a strong light–matter interaction can also
excite many electrons to interact with each other, which can deteriorate
switching through Coulomb-induced dephasing. Here, we demonstrate
that optical transmission of carbon nanotubes can be switched reversibly
hundreds of times via detuned Rabi splitting, faster than 200 fs
via nonresonant but strong control pulses. Our detailed experiment–theory
analysis identifies that quantum memory in Coulombic scattering restores
reversibility while simultaneously reducing undesirable pure dephasing
of coherences. This capability creates new possibilities for ultrafast
quantum optoelectronic processing in quantum materials.
In this work, we provide energy-efficient architectural support for floating point accuracy. Our goal is to provide accuracy that is far greater than that provided by the processor's hardware floating point unit (FPU). Specifically, for each floating point addition performed, we "recycle" that operation's error: the difference between the finite-precision result produced by the hardware and the result that would have been produced by an infinite-precision FPU. We make this error architecturally visible such that it can be used, if desired, by software. Experimental results on physical hardware show that software that exploits architecturally recycled error bits can achieve accuracy comparable to a 2Bbit FPU with performance and energy that are comparable to a B-bit FPU.
Reversible, 200 fs optical switching of carbon nanotubes is demonstrated by utilizing Coulombic many-body effects, strong exciton binding and quantum memory in Coulombic scattering which together eliminate pure dephasing of coherences.
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