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Article: Units of rotational information
Title | Units of rotational information |
---|---|
Authors | |
Keywords | Quantum reference frames Quantum Fisher information Simulation of rotation gates Quantum cloning Quantum superreplication Resource theory of asymmetry |
Issue Date | 2017 |
Publisher | IOP Publishing: Open Access Journals. The Journal's web site is located at http://iopscience.iop.org/1367-2630/ |
Citation | New Journal of Physics, 2017, v. 19, article no. 123003 How to Cite? |
Abstract | Entanglement in angular momentum degrees of freedom is a precious resource for quantum metrology and control. Here we study the conversions of this resource, focusing on Bell pairs of spin-J particles, where one particle is used to probe unknown rotations and the other particle is used as reference. When a large number of pairs are given, we show that every rotated spin-J Bell state can be reversibly converted into an equivalent number of rotated spin one-half Bell states, at a rate determined by the quantum Fisher information. This result provides the foundation for the definition of an elementary unit of information about rotations in space, which we call the Cartesian refbit. In the finite copy scenario, we design machines that approximately break down Bell states of higher spins into Cartesian refbits, as well as machines that approximately implement the inverse process. In addition, we establish a quantitative link between the conversion of Bell states and the simulation of unitary gates, showing that the fidelity of probabilistic state conversion provides upper and lower bounds on the fidelity of deterministic gate simulation. The result holds not only for rotation gates, but also to all sets of gates that form finite-dimensional representations of compact groups. For rotation gates, we show how rotations on a system of given spin can simulate rotations on a system of different spin. |
Persistent Identifier | http://hdl.handle.net/10722/258245 |
ISSN | 2023 Impact Factor: 2.8 2023 SCImago Journal Rankings: 1.090 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Yang, Y | - |
dc.contributor.author | Chiribella, G | - |
dc.contributor.author | Hu, Q | - |
dc.date.accessioned | 2018-08-22T01:35:17Z | - |
dc.date.available | 2018-08-22T01:35:17Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | New Journal of Physics, 2017, v. 19, article no. 123003 | - |
dc.identifier.issn | 1367-2630 | - |
dc.identifier.uri | http://hdl.handle.net/10722/258245 | - |
dc.description.abstract | Entanglement in angular momentum degrees of freedom is a precious resource for quantum metrology and control. Here we study the conversions of this resource, focusing on Bell pairs of spin-J particles, where one particle is used to probe unknown rotations and the other particle is used as reference. When a large number of pairs are given, we show that every rotated spin-J Bell state can be reversibly converted into an equivalent number of rotated spin one-half Bell states, at a rate determined by the quantum Fisher information. This result provides the foundation for the definition of an elementary unit of information about rotations in space, which we call the Cartesian refbit. In the finite copy scenario, we design machines that approximately break down Bell states of higher spins into Cartesian refbits, as well as machines that approximately implement the inverse process. In addition, we establish a quantitative link between the conversion of Bell states and the simulation of unitary gates, showing that the fidelity of probabilistic state conversion provides upper and lower bounds on the fidelity of deterministic gate simulation. The result holds not only for rotation gates, but also to all sets of gates that form finite-dimensional representations of compact groups. For rotation gates, we show how rotations on a system of given spin can simulate rotations on a system of different spin. | - |
dc.language | eng | - |
dc.publisher | IOP Publishing: Open Access Journals. The Journal's web site is located at http://iopscience.iop.org/1367-2630/ | - |
dc.relation.ispartof | New Journal of Physics | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | Quantum reference frames | - |
dc.subject | Quantum Fisher information | - |
dc.subject | Simulation of rotation gates | - |
dc.subject | Quantum cloning | - |
dc.subject | Quantum superreplication | - |
dc.subject | Resource theory of asymmetry | - |
dc.title | Units of rotational information | - |
dc.type | Article | - |
dc.identifier.email | Chiribella, G: giulio@hku.hk | - |
dc.identifier.authority | Chiribella, G=rp02035 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1088/1367-2630/aa94e5 | - |
dc.identifier.scopus | eid_2-s2.0-85039770092 | - |
dc.identifier.hkuros | 287008 | - |
dc.identifier.volume | 19 | - |
dc.identifier.spage | article no. 123003 | - |
dc.identifier.epage | article no. 123003 | - |
dc.identifier.isi | WOS:000424885300003 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 1367-2630 | - |