Effect of Quantum Point Contact Measurement on Electron Spin State in Quantum Dot

Abstract

We study the time evolution of two electron spin states in a double quantum-dot system, which includes a nearby quantum point contact (QPC) as a measurement device. We obtain that the QPC measurement induced decoherence is in time scales of microsecond. We also find that the enhanced QPC measurement will trap the system in its initial spin states, which is consistent with quantum Zeno effect.

4 pages, 5 figures

References in corpus (6)

• Spins in few-electron quantum dots
• Single-shot read-out of an individual electron spin in a quantum dot
• Spin qubits in graphene quantum dots
• Relaxation, dephasing, and quantum control of electron spins in double quantum dots
• Suppressing Spin Qubit Dephasing by Nuclear State Preparation
• Measurement efficiency and n-shot read out of spin qubits