Improvement in quantum communication using quantum switch
arXiv:2108.14001 · doi:10.1088/1402-4896/acbcf7
Abstract
Applications of the quantum switch on quantum channels have recently become a topic of intense discussion. In the present work, we show that some useless (for communication) channels may provide useful communication under the action of quantum switch for several information-theoretic tasks: quantum random access codes, quantum steering, etc. We demonstrate that the quantum switch can also be useful in preventing the loss of coherence in a system when only coherence-breaking channels are the available channels for communication. We also show that if a useless quantum channel does not provide useful communication even after using a quantum switch, concatenating the channel with another suitable quantum channel, and subsequently using the switch, one may achieve useful communication. Finally, we discuss how the introduction of noise in the quantum switch can reduce the advantage that the switch provides.
arXiv comment14 pages, 9 figures. Some typos fixed
References in corpus (37)
- Quantifying Coherence
- Quantum correlations with no causal order
- Experimental criteria for steering and the Einstein-Podolsky-Rosen paradox
- General Entanglement Breaking Channels
- Quantum Steering
- Quantum computations without definite causal structure
- The extraction of work from quantum coherence
- Experimental Superposition of Orders of Quantum Gates
- Computational advantage from quantum-controlled ordering of gates
- Coherence as a resource in decision problems: The Deutsch-Jozsa algorithm and a variation
- Robustness of asymmetry and coherence of quantum states
- Experimental Verification of an Indefinite Causal Order
- Perfect discrimination of no-signalling channels via quantum superposition of causal structures
- Indefinite Causal Order in a Quantum Switch
- An Invitation to Quantum Incompatibility
- Exponential Communication Complexity Advantage from Quantum Superposition of the Direction of Communication
- Quantification of Einstein-Podolski-Rosen steering for two-qubit states
- Quantum Metrology with Indefinite Causal Order
- Qubit Entanglement Breaking Channels
- Indefinite causal order enables perfect quantum communication with zero capacity channels
- Quantum Shannon theory with superpositions of trajectories
- Quantum Switch for the Quantum Internet: Noiseless Communications through Noisy Channels
- Experimental Quantum Communication Enhancement by Superposing Trajectories
- Notes on Joint Measurability of Quantum Observables
- Communication through coherent control of quantum channels
- Communication through quantum-controlled noise
- Communication Enhancement Through Quantum Coherent Control of Channels in an Indefinite Causal-order Scenario
- Incompatibility breaking quantum channels
- Continuous variable steering and incompatibility via state-channel duality
- Thermodynamic advancement in the causally inseparable occurrence of thermal maps
- Quantifying Quantumness of Channels Without Entanglement
- Quantum random access codes and incompatibility of measurements
- Classical Communications with Indefinite Causal Order for completely depolarizing channels
- Superposition of causal order enables perfect quantum teleportation with very noisy singlets
- Coherence of quantum channels
- Bell-type inequality in quantum coherence theory as an entanglement witness
- Role of maximally entangled states in the context of linear steering inequalities