Approaching Landauer’s limit in a single superconducting vortex memory bit
In the authors' words
This work investigates the energy required to manipulate a memory bit using a superconducting vortex confined in a nanoscale double-well pinning potential. In the experiments, various double-well systems subjected to sinusoidal forces is explored, and the effects of both driving force and frequency is analyzed. Results reveal characteristic stochastic resonance behavior for weak drives and adiabatic manipulation at strong, low-frequency drives. Although our experimental method requires a steady sinusoidal drive incompatible with Landauer’s erasure protocol, our numerical analysis demonstrates that the work required for such bit manipulation (erasure) is within an order of magnitude of Landauer’s limit () at 4.2 K. These findings open possibilities for creating highly efficient memory elements that could be integrated with cryogenic quantum circuits or function as topological quantum computing qubits; thereby contributing to memory devices with lower energy consumption and mitigating the escalating global energy demand in the computing industry. The authors investigate the energy required to manipulate a memory bit encoded in the position of a superconducting vortex in a nanoscale double-well pinning potential. Their numerical analysis demonstrates that the work required for such bit manipulation is within an order of magnitude of Landauer’s limit.
Appeared: Saturday, September 26. Nature Communications. Peer-reviewed journal.