Real-time observation of Cooper pair splitting showing strong non-local correlations
arXiv:2012.10373 · doi:10.1038/s41467-021-26627-8
Abstract
Controlled generation and detection of quantum entanglement between spatially separated particles constitute an essential prerequisite both for testing the foundations of quantum mechanics and for realizing future quantum technologies. Splitting of Cooper pairs from a superconductor provides entangled electrons at separate locations. However, experimentally accessing the individual split Cooper pairs constitutes a major unresolved issue as they mix together with electrons from competing processes. Here, we overcome this challenge with the first real-time observation of the splitting of individual Cooper pairs, enabling direct access to the time-resolved statistics of Cooper pair splitting. We determine the correlation statistics arising from two-electron processes and find a pronounced peak that is two orders of magnitude larger than the background. Our experiment thereby allows to unambiguously pinpoint and select split Cooper pairs with 99 % fidelity. These results open up an avenue for performing experiments that tap into the spin-entanglement of split Cooper pairs.
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- Signatures of Majorana protection in a three-site Kitaev chain
- Coupled superconducting spin qubits with spin-orbit interaction
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- Dynamic Cooper Pair Splitter
- Local and non-local two-electron tunneling processes in a Cooper pair splitter
- Adiabatic Cooper pair splitter
- Double-quantum-dot Andreev molecules: Phase diagrams and critical evaluation of effective models
- Continuous microwave photon counting by semiconductor-superconductor hybrids
- Thermoelectric processes of quantum normal-superconductor interfaces
- Photon emission statistics of a driven microwave cavity
- Optimal Entanglement Witness for Cooper Pair Splitters
- Quantum Dot Source-Drain Transport Response at Microwave Frequencies
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- Nonlocal Andreev transport through a quantum dot in a magnetic field: Interplay between Kondo, Zeeman, and Cooper-pair correlations
- Coherence of an Electronic Two-Level System under Continuous Charge Sensing by a Quantum Dot Detector
- Breaking and trapping Cooper pairs by Rydberg-molecule spectroscopy in atomic Fermi superfluids
- Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter
- Spin-resolved nonlocal transport in proximitized Rashba nanowires
- Probing Green's Function Zeros by Co-tunneling through Mott Insulators
- Coulomb-mediated single-electron heat transfer statistics across capacitively coupled silicon nanodots
- Current cross-correlation spectroscopy of Majorana bound states
- Three-body Fermi-liquid corrections for Andreev transport through quantum dots
- Cooper-pair splitters as circuit elements for realizing topological superconductors
- Efficient Cooper Pair Splitting Without Interactions