Experimental Proof of Quantum Nonlocality without Squeezing

Abstract

It is shown that the ensemble $\{p(\alpha ),|\alpha >|{\alpha }^{\ast }>\}$ where $p(\alpha )$ is a Gaussian distribution of finite variance and $|\alpha >$ is a coherent state can be better discriminated with an entangled measurement than with any local strategy supplemented by classical communication. Although this ensemble consists of products of quasi-classical states, it exhibits some quantum nonlocality. This remarkable effect is demonstrated experimentally by implementing the optimal local strategy together with a joint nonlocal strategy that yields a higher fidelity.

4 pages, 2 figures

References in corpus (5)

• Quantum benchmark for storage and transmission of coherent states
• Unconditional quantum cloning of coherent states with linear optics
• Minimum Renyi and Wehrl entropies at the output of bosonic channels
• Phase Conjugation of Continuous Quantum Variables
• Demonstrating quantum nonlocality without entanglement

Cited by in corpus (16)

• Gaussian Quantum Information
• High-rate quantum cryptography in untrusted networks
• Quantum optical coherence can survive photon losses: a continuous-variable quantum erasure correcting code
• Inductive supervised quantum learning
• Quantum learning of coherent states
• Fidelity criterion for quantum-domain transmission and storage of coherent states beyond unit-gain constraint
• Certifying entangled measurements in known Hilbert spaces
• Certifying quantumness: Benchmarks for the optimal processing of generalized coherent and squeezed states
• Determining complementary properties with quantum clones
• Iso-entangled bases and joint measurements
• Simple proof of the quantum benchmark fidelity for continuous-variable quantum devices
• Operational effects of the UNOT gate on classical and quantum correlations
• Optimal estimation of parameters encoded in coherent states quadratures
• Strongly non-quantitative classical information in quantum carriers
• Dealing with ignorance: universal discrimination, learning and quantum correlations
• Mutual information of optical communication in phase conjugating Gaussian channels