Observation of the tradeoff between internal quantum nonseparability and external classical correlations
arXiv:2103.04276 · doi:10.1103/PhysRevA.104.062442
Abstract
The monogamy relations of entanglement are highly significant. However, they involve only amounts of entanglement shared by different subsystems. Results on monogamy relations between entanglement and other kinds of correlations, and particularly classical correlations, are very scarce. Here we experimentally observe a tradeoff relation between internal quantum nonseparability and external total correlations in a photonic system and found that even purely classical external correlations have a detrimental effect on internal nonseparability. The nonseparability we consider, measured by the concurrence, is between different degrees of freedom within the same photon, and the external classical correlations, measured by the standard quantum mutual information, are generated between the photons of a photon pair using the time-bin method. Our observations show that to preserve the internal entanglement in a system, it is necessary to maintain low external correlations, including classical ones, between the system and its environment.
arXiv comment8 pages, 4 figures
References in corpus (24)
- Quantum entanglement
- Entanglement of Formation of an Arbitrary State of Two Qubits
- Distributed Entanglement
- On the Measurement of Qubits
- Quantum Communication
- The classical-quantum boundary for correlations: discord and related measures
- Ultra-bright source of polarization-entangled photons
- Unified View of Quantum and Classical Correlations
- General Monogamy Inequality for Bipartite Qubit Entanglement
- Entanglement monotones
- Quantum Open System Theory: Bipartite Aspects
- Monogamy of entanglement and other correlations
- Femtosecond Time-Bin Entangled Qubits for Quantum Communication
- Maximally entangled mixed states of two qubits
- Experimental Teleportation of a Quantum Controlled-NOT Gate
- When is a non-Markovian quantum process classical?
- Postselection-loophole-free Bell violation with genuine time-bin entanglement
- Monogamy of entanglement without inequalities
- Experimental validation of quantum steering ellipsoids and tests of volume monogamy relations
- Monogamy inequality for any local quantum resource and entanglement
- Internal entanglement and external correlations of any form limit each other
- Monogamy inequality for entanglement and local contextuality
- Realization of the tradeoff between internal and external entanglement
- Existence of maximally correlated states