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Bolometric Detection of Quantum Shot Noise in Coupled Mesoscopic Systems

昌幸 橋坂, Masayuki Hashisaka, Yoshiaki Yamauchi, Shuji Nakamura, Shinya Kasai, Teruo Ono, Kensuke Kobayashi

Published Dec 1, 2008• 0 citations
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Abstract

We demonstrate a new scheme to detect the quantum shot noise in coupled mesoscopic systems.\nBy applying the noise thermometry to the capacitively coupled quantum point contacts (QPCs) we\nprove that the noise temperature of one QPC is in perfect proportion to that of the other QPC which\nis driven to non-equilibrium to generate quantum shot noise. The present mesoscopic bolometry,\nwhich is sensitive to the energy flow of » 1 fW, allows us to detect the energy exchange between\nquantum systems at finite frequency and can also be applied for diverse precise measurements.

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AIP conference proceedings•Jan 1, 2005•0 citations
We demonstrate a new scheme to detect the quantum shot noise in coupled mesoscopic systems.\nBy applying the noise thermometry to the capacitively coupled quantum point contacts (QPCs) we\nprove that the noise temperature of one QPC is in perfect proportion to that of the other QPC which\nis driven to non-equilibrium to generate quantum shot noise. The present mesoscopic bolometry,\nwhich is sensitive to the energy flow of » 1 fW, allows us to detect the energy exchange between\nquantum systems at finite frequency and can also be applied for diverse precise measurements.
We demonstrate a scheme to detect the quantum shot noise in coupled mesoscopic systems. By applying the noise thermometry to the capacitively coupled quantum point contacts (QPCs) we prove that the noise temperature of one QPC is in perfect proportion to that of the other QPC which is driven to nonequilibrium to generate quantum shot noise. The present mesoscopic bolometry, which is sensitive to the energy flow of $\ensuremath{\sim}1\text{ }\text{fW}$, allows us to detect the energy exchange between quantum systems at finite frequency and can also be applied for diverse precise measurements.
Mesoscopic shot noise is not only probabilistic: it has features which reflect quantum mechanical entanglement. We discuss recent proposals of orbital entanglement generation and detection in mesoscopic coherent conductors. Orbital entanglement avoids the difficulty of detecting spin and leads to simpler structures. Orbital entanglement schemes invoke two two-particle sources. The index of the source plays the role of a pseudo-spin. The rotation of qubits can be implemented with beam-splitters or even just quantum point contacts. Entanglement is detected via violation of a Bell inequality. The necessary correlations can be extracted from shot noise measurements. Possible two particle sources are Cooper pairs emitted from superconductors or even simpler electron-hole pairs generated at tunnel contacts or generated dynamically with the help of oscillating potentials.
We use the nonequilibrium bosonization technique to investigate the effects of the Coulomb interaction on quantum Hall edge states at a filling factor ν=2, partitioned by a quantum point contact (QPC). We find that, due to the integrability of charge dynamics, edge states evolve to a nonequilibrium stationary state with a number of specific features. In particular, the noise temperature Θ of a weak backscattering current between edge channels is linear in voltage bias applied at the QPC, independently of the interaction strength. In addition, it is a nonanalytical function of the QPC transparency T and scales as Θ proportional Tln(1/T) at T << 1. Our predictions are confirmed by exact numerical calculations.
Mesoscopic shot noise is not only probabilistic: it has features which reflect quantum mechanical entanglement. We discuss recent proposals of orbital entanglement generation and detection in mesoscopic coherent conductors. Orbital entanglement avoids the difficulty of manipulating spin and leads to simpler structures. Orbital entanglement schemes invoke two two‐particle sources. The index of the source plays the role of a pseudo‐spin. The rotation of qubits can be implemented with beam‐splitters or even just quantum point contacts. Entanglement is detected via violation of a Bell inequality. The necessary correlations can be extracted from shot noise measurements.