Experimental entanglement-assisted weak measurement of phase shift
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F20%3A73602883" target="_blank" >RIV/61989592:15310/20:73602883 - isvavai.cz</a>
Result on the web
<a href="https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-28-23-34639&id=442113" target="_blank" >https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-28-23-34639&id=442113</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1364/OE.403711" target="_blank" >10.1364/OE.403711</a>
Alternative languages
Result language
angličtina
Original language name
Experimental entanglement-assisted weak measurement of phase shift
Original language description
Weak value amplification is a popular method in quantum metrology for enhancing the sensitivity at the expense of the signal intensity. Recently, it was suggested that the trade-off between signal intensity and sensitivity can be improved by using an entangled auxiliary system. Here, we experimentally investigate such entanglement-assisted weak measurement of small conditional phase shifts induced by an interaction between ancilla and meter qubits. We utilize entangled photon pairs and implement the required three-qubit quantum logic circuit with linear optics. The circuit comprises a two-qubit controlled phase gate and a three-qubit controlled-controlled phase gate with fully tunable conditional phase shifts. We fully characterize the output states of our circuit by quantum state tomography and perform a comprehensive analysis of the trade-off between the measurement sensitivity and the success probability of the protocol. The observed experimental results are in good qualitative agreement with theoretical predictions, but the overall performance of our setup is limited by various experimental imperfections. We provide a detailed theoretical analysis of the influence of dephasing of the entangled ancilla state, which is one of the main sources of imperfections in the experiment. We also discuss the ultimate scaling with the dimension of the entangled ancilla system.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
Project
<a href="/en/project/GA16-17314S" target="_blank" >GA16-17314S: Complex multiqubit optical quantum logic gates</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
OPTICS EXPRESS
ISSN
1094-4087
e-ISSN
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Volume of the periodical
28
Issue of the periodical within the volume
23
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
34639-34655
UT code for WoS article
000589869600068
EID of the result in the Scopus database
2-s2.0-85096039228