Single-shot readout of electron spins in a semiconductor quantum dot |
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Authors: | R Hanson LH Willems van Beveren IT Vink JM Elzerman FHL Koppens LP Kouwenhoven LMK Vandersypen |
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Institution: | aKavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600, GA, Delft, The Netherlands |
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Abstract: | We report on a method for single-shot readout of spin states in a semiconductor quantum dot that is robust against charge noise and can be used even when the electron temperature exceeds the energy splitting between the states. The spin states are first correlated to different charge states using a spin dependence of the tunnel rates. A subsequent fast measurement of the charge on the dot then reveals the original spin state. The method is analyzed theoretically, and compared to a previously used method. We experimentally demonstrate the method by performing readout of the two-electron spin states, achieving a single-shot visibility of more than 80%. We find very long triplet-to-singlet relaxation times (up to several milliseconds), with a strong dependence on in-plane magnetic field. |
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Keywords: | Electron spin Quantum dot Quantum computing Readout |
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