High fidelity measurement of singlet-triplet states in a quantum dot

Abstract

We demonstrate experimentally a read-out method that distinguishes between two-electron spin states in a quantum dot. This scheme combines the advantages of the two existing mechanisms for spin-to-charge conversion with single-shot charge detection: a large difference in energy between the two states and a large difference in tunnel rate between the states and a reservoir. As a result, a spin measurement fidelity of 97% was achieved, which is much higher than previously reported fidelities.

4 pages, 1 figure

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Cited by in corpus (6)

• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Fast spin information transfer between distant quantum dots using individual electrons
• Quantum manipulation of two-electron spin states in metastable double quantum dots
• On fault-tolerance with noisy and slow measurements
• Robust energy selective tunneling readout of singlet triplet qubits under large magnetic field gradient
• Wigner-molecularization-enabled dynamic nuclear field programming