Non-destructive measurement of electron spins in a quantum dot

Abstract

We propose and implement a non-destructive measurement that distinguishes between two-electron spin states in a quantum dot. In contrast to earlier experiments with quantum dots, the spins are left behind in the state corresponding to the measurement outcome. By measuring the spin states twice within a time shorter than the relaxation time, T1, correlations between consecutive measurements are observed. They disappear as the wait time between measurements become comparable to T1. The correlation between the post-measurement state and the measurement outcome is measured to be ~90% on average.

5 pages, 5 figures

References in corpus (4)

• Single-shot read-out of an individual electron spin in a quantum dot
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Excited-state spectroscopy on a nearly-closed quantum dot via charge detection
• Measurement efficiency and n-shot read out of spin qubits

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• Identifying single electron charge sensor events using wavelet edge detection
• Controlled exchange interaction for quantum logic operations with spin qubits in coupled quantum dots
• Gated combo nanodevice for sequential operations on single electron spin
• All-optical non-demolition measurement of single-hole spin in a quantum-dot molecule