Abstract

We propose a method for quantum enhanced phase estimation based on continuous variable (CV) quantum teleportation. The phase shift probed by a coherent state can be enhanced by repeatedly teleporting the state back to interact with the phase shift again using a supply of two-mode squeezed vacuum states. In this way a sequential protocol exhibiting both super-resolution and super-sensitivity can be obtained due to the coherent addition of the phase shift. The protocol enables Heisenberg-limited sensitivity and super-resolution given sufficiently strong squeezing. The proposed method could be implemented with current or near-term technology of CV teleportation.

Quantum metrology: Enhancing measurements with quantum teleportation

A strategy for enhancing optical phase measurements is proposed that exploits quantum teleportation. The ability to make highly sensitive measurements underpins modern science. Quantum effects can be used in a number of ways to enhance the sensitivity of certain measurements, but most approaches in quantum metrology exploit quantum entanglement, which can be challenging to implement in some systems. A team of researchers in Denmark, led by Johannes Borregaard from the University of Copenhagen, now propose an alternative strategy for quantum-enhancing phase measurements, which is based on quantum teleportation. Their idea is to enhance optical phase measurements by repeatedly teleporting back the probe to interact with a phase shift multiple times. This sequential protocol should enable both super-resolution and super-sensitivity, and could be implemented using current or near-term technology.

Details

Title
Super sensitivity and super resolution with quantum teleportation
Author
Borregaard, J 1   VIAFID ORCID Logo  ; Gehring, T 2 ; Neergaard-Nielsen, J S 2 ; Andersen, U L 2 

 University of Copenhagen, QMATH, Department of Mathematical Sciences, Copenhagen, Denmark (GRID:grid.5254.6) (ISNI:0000 0001 0674 042X) 
 Technical University of Denmark, Fysikvej, Center for Macroscopic Quantum States (bigQ), Department of Physics, Kgs. Lyngby, Denmark (GRID:grid.5170.3) (ISNI:0000 0001 2181 8870) 
Publication year
2019
Publication date
Dec 2019
Publisher
Nature Publishing Group
e-ISSN
20566387
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2176706740
Copyright
This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.