Kavli Affiliate: Sander Otte
| First 5 Authors: Rik Broekhoven, Curie Lee, Soo-hyon Phark, Sander Otte, Christoph Wolf
| Summary:
Certifying quantum entanglement is a critical step towards realizing
quantum-coherent applications of surface spin systems. In this work, we show
that entanglement can be unambiguously shown in a scanning tunneling microscope
(STM) with electron spin resonance by exploiting the fact that entangled states
undergo a free time evolution with a distinct characteristic time constant that
clearly distinguishes it from any other time evolution in the system. By
implementing a suitable phase control scheme, the phase of this time evolution
can be mapped back onto the population of one entangled spin in a pair, which
can then be read out reliably using a weakly coupled sensor spin in the
junction of the scanning tunneling microscope. We demonstrate through open
quantum system simulations with realistic spin systems, which are currently
available with spin coherence times of $T_2approx$ 300 ns, that a signal
directly correlated with the degree of entanglement can be measured at a
temperature range of 100$-$400 mK accessible in sub-Kelvin cryogenic STM
systems.
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