On-chip terahertz spectroscopic techniques for measuring mesoscopic quantum systems

On-chip terahertz spectroscopic techniques for measuring mesoscopic quantum systems.

We present the self-aligned fabrication of on-chip devices in which waveguides, incorporating integrated photoconductive switches, are combined with two-dimensional electron systems to allow probing of the ultrafast (terahertz frequency range) properties of confined semiconductor systems, both at cryogenic temperatures and in high magnetic fields. We demonstrate the direct injection of on-chip ...

Preparing, manipulating, and measuring quantum states on a chip

We use gate voltage control of the exchange interaction to prepare, manipulate, and measure two-electron spin states in a GaAs double quantum dot. By placing two electrons in a single dot at low temperatures we prepare the system in a spin singlet state. The spin singlet is spatially separated by transferring an electron to an adjacent dot. The spatially separated spin singlet state dephases in...

Mesoscopic systems: classical irreversibility and quantum coherence.

Mesoscopic physics is a sub-discipline of condensed-matter physics that focuses on the properties of solids in a size range intermediate between bulk matter and individual atoms. In particular, it is characteristic of a domain where a certain number of interacting objects can easily be tuned between classical and quantum regimes, thus enabling studies at the border of the two. In magnetism, suc...

Interface Design Techniques for Single-Chip Systems

This paper quantifies the performance of typical functional unit interface designs in single-chip systems. We introduce a specific equation to guide the design of optimal module interfaces. We show how the equation and interface considerations lead to more efficient queue structures for request buffering. For a specific single-chip design, we use simulation to show that: 1) For low request rate...

Testing and Logic Optimization Techniques for Systems on Chip