Quantum Metrological Power of Continuous-Variable Quantum Networks
- URL: http://arxiv.org/abs/2107.14251v4
- Date: Tue, 22 Feb 2022 16:33:56 GMT
- Title: Quantum Metrological Power of Continuous-Variable Quantum Networks
- Authors: Hyukgun Kwon, Youngrong Lim, Liang Jiang, Hyunseok Jeong, and Changhun
Oh
- Abstract summary: We show that most continuous-variable quantum networks provide entanglement to quantum states in distant nodes.
We numerically demonstrate that even when CV quantum networks are composed of local beam splitters, the quantum enhancement can be attained when the depth is sufficiently large.
- Score: 2.175441462022736
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We investigate the quantum metrological power of typical continuous-variable
(CV) quantum networks. Particularly, we show that most CV quantum networks
provide an entanglement to quantum states in distant nodes that enables one to
achieve the Heisenberg scaling in the number of modes for distributed quantum
displacement sensing, which cannot be attained using an unentangled probe
state. Notably, our scheme only requires local operations and measurements
after generating an entangled probe using the quantum network. In addition, we
find a tolerable photon-loss rate that maintains the quantum enhancement.
Finally, we numerically demonstrate that even when CV quantum networks are
composed of local beam splitters, the quantum enhancement can be attained when
the depth is sufficiently large.
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