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Determining Complementary Properties with Quantum Clones
G S Thekkadath1, R Y Saaltink1, L Giner1
1Department of Physics, Centre for Research in Photonics, University of Ottawa, 25 Templeton Street, Ottawa, Ontario K1N 6N5, Canada.
Physical Review Letters
|September 27, 2017
Summary
Quantum mechanics prevents perfect copying, but "twins" created via optimal cloning allow simultaneous measurement of complementary properties. This experimental demonstration with photons recovers classical-like state determination.
Area of Science:
- Quantum Information Science
- Quantum Measurement Theory
- Experimental Quantum Physics
Background:
- Classical physics allows simultaneous measurement of complementary properties.
- Quantum mechanics inherently limits simultaneous precision due to measurement disturbance.
- Perfect cloning of quantum states is fundamentally impossible.
Purpose of the Study:
- To investigate optimal cloning as a quantum analog to classical copying for state determination.
- To explore if entangled "twins" can circumvent quantum measurement limitations.
- To experimentally verify the proposed method using single photons.
Main Methods:
- Utilized optimal quantum cloning to generate entangled "twins" of an input system.
- Performed joint measurements on the entangled twins.
- Experimentally implemented the protocol using single photons with polarization as complementary properties.
Main Results:
- The "twins" faithfully reproduced input system properties, similar to perfect copies.
- Entanglement between twins enabled a joint measurement equivalent to simultaneous measurement on the input.
- Experimental results demonstrated the recovery of the system's state for complementary observables.
Conclusions:
- Optimal cloning provides a viable quantum strategy to achieve classical-like simultaneous state determination.
- Entangled twins serve as a resource to overcome quantum measurement limitations for complementary properties.
- The experimental validation confirms the theoretical proposal's feasibility and effectiveness.
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