Indirect quantum measurement of a single quantum spin

✍ Scribed by L.N. Bulaevskii; G. Ortiz

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 79 KB
• Volume: 18
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(02)01071-8

✦ Synopsis

We establish the conditions to observe a single localized quantum spin 1 2 using a tunneling current of electrons as the probe in an indirect quantum measurement. We show that a strong tunneling current, due to the shot noise, suppresses the spin dynamics, such as the spin precession in an external magnetic ÿeld (quantum Zeno e ect), while a weak tunneling current preserves the spin precession but the oscillatory component of the current is of the same order as the noise. Within our semi-classical analysis we describe the physical requisites to observe a signature of quantum oscillations in the current-current correlation function.