Experimental optimal orienteering via parallel and antiparallel spins

Abstract

Antiparallel spins are superior in orienteering to parallel spins. This intriguing phenomenon is tied to entanglement associated with quantum measurements rather than quantum states. Using photonic systems, we experimentally realize the optimal orienteering protocols based on parallel spins and antiparallel spins, respectively. The optimal entangling measurements for decoding the direction information from parallel spins and antiparallel spins are realized using photonic quantum walks, which is a useful idea that is of wide interest in quantum information processing and foundational studies. Our experiments clearly demonstrate the advantage of antiparallel spins over parallel spins in orienteering. In addition, entangling measurements can extract more information than local measurements even if no entanglement is present in the quantum states.

References in corpus (23)

• Quantum entanglement
• Quantum Cryptography
• Advances in Quantum Metrology
• Entanglement detection
• A strong loophole-free test of local realism
• Quantum Nonlocality without Entanglement
• Ultra-bright source of polarization-entangled photons
• Symmetric Informationally Complete Quantum Measurements
• Reference frames, superselection rules, and quantum information
• Spin flips and quantum information for anti-parallel spins
• Maximum-likelihood estimation of quantum measurement
• Direct characterization of linear-optical networks
• Realization of single-qubit positive operator-valued measurement via a one-dimensional photonic quantum walk
• Deterministic realization of collective measurements via photonic quantum walks
• Entanglement of photons in their dual wave-particle nature
• Entanglement 25 years after Quantum Teleportation: testing joint measurements in quantum networks
• Quantum walk as a generalized measuring device
• Entangling measurements for multiparameter estimation with two qubits
• Collective versus local measurements on two parallel or antiparallel spins
• Separable Measurement Estimation of Density Matrices and its Fidelity Gap with Collective Protocols
• Universally Fisher-Symmetric Informationally Complete Measurements
• Implementation of generalized measurements on a qudit via quantum walks
• The Elegant Joint Quantum Measurement and some conjectures about N-locality in the Triangle and other Configurations

Cited by in corpus (18)

• Full network nonlocality
• Bilocal Bell inequalities violated by the quantum Elegant Joint Measurement
• Experimental progress on quantum coherence: detection, quantification, and manipulation
• Entanglement swapping and quantum correlations via Elegant Joint Measurements
• Imaginarity-free quantum multiparameter estimation
• Nonlocality, steering and quantum state tomography in a single experiment
• Discriminating mixed qubit states with collective measurements
• Accelerated variational quantum eigensolver with joint Bell measurement
• Inferring physical properties of symmetric states from the fewest copies
• Correspondence between entangled states and entangled bases under local transformations
• Coin dimensionality as a resource in quantum metrology involving discrete-time quantum walks
• Experimental Realization of Genuine Three-copy Collective Measurements for Optimal Information Extraction
• Achieving the Multi-parameter Quantum Cramér-Rao Bound with Antiunitary Symmetry
• Attainability of quantum state discrimination bounds with collective measurements on finite copies
• Experimental Masking of Real Quantum States
• Non-locality of conjugation symmetry: characterization and examples in quantum network sensing
• Optimal estimation of three parallel spins with genuine and restricted collective measurements
• Approaching the Multiparameter Quantum Cramér-Rao Bound via Classical Correlation and Entangling Measurements