Quantum Noise as an Entanglement Meter
Transport in a quantum point contact (QPC) can be used to generate many-body entanglement of Fermi seas in the leads. A universal relation is found between the generated entanglement entropy and the fluctuations of electric current, which is valid for any protocol of driving the QPC. This relation...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/51772 https://orcid.org/0000-0002-4268-731X |
| Summary: | Transport in a quantum point contact (QPC) can be used to generate many-body entanglement of Fermi
seas in the leads. A universal relation is found between the generated entanglement entropy and the
fluctuations of electric current, which is valid for any protocol of driving the QPC. This relation offers a
basis for direct electric measurement of entanglement entropy. In particular, by utilizing space-time
duality of 1D systems, we relate electric noise generated by opening and closing the QPC periodically in
time with the seminal S=1/3 logL prediction of conformal field theory. |
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