Observation of time-invariant coherence in a room temperature quantum simulator

Abstract

The ability to live in coherent superpositions is a signature trait of quantum systems and constitutes an irreplaceable resource for quantum-enhanced technologies. However, decoherence effects usually destroy quantum superpositions. It has been recently predicted that, in a composite quantum system exposed to dephasing noise, quantum coherence in a transversal reference basis can stay protected for indefinite time. This can occur for a class of quantum states independently of the measure used to quantify coherence, and requires no control on the system during the dynamics. Here, such an invariant coherence phenomenon is observed experimentally in two different setups based on nuclear magnetic resonance at room temperature, realising an effective quantum simulator of two- and four-qubit spin systems. Our study further reveals a novel interplay between coherence and various forms of correlations, and highlights the natural resilience of quantum effects in complex systems.

5+4 pages, 3 figures; close to published version

References in corpus (15)

• Sudden Death of Entanglement
• Measuring Quantum Coherence with Entanglement
• Description of quantum coherence in thermodynamic processes requires constraints beyond free energy
• Robustness of coherence: An operational and observable measure of quantum coherence
• Converting Coherence to Quantum Correlations
• Frozen Quantum Coherence
• Coherence as a resource in decision problems: The Deutsch-Jozsa algorithm and a variation
• Robust dynamical decoupling for quantum computing and quantum memory
• Measure-Independent Freezing of Quantum Coherence
• Universal freezing of quantum correlations within the geometric approach
• Measuring bipartite quantum correlations of an unknown state
• Unifying approach to the quantification of bipartite correlations by Bures distance
• Global Quantum discord of multi-qubit states
• Thermal Equilibrium as an Initial State for Quantum Computation by NMR
• Overcoming ambiguities in classical and quantum correlation measures

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• Demonstrating quantum coherence and metrology that is resilient to transversal noise
• Maximal coherence in generic basis
• Endurance of quantum coherence due to particle indistinguishability in noisy quantum networks
• Markovian evolution of quantum coherence under symmetric dynamics
• Coherence and entanglement dynamics of vibrating qubits
• Validating and controlling quantum enhancement against noise by motion of a qubit
• Non-Markovianity and coherence of a moving qubit inside a leaky cavity
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• Dynamics of spatially indistinguishable particles and entanglement protection
• Experimental tests of coherence and entanglement conservation
• Quantum gates by inverse engineering of a Hamiltonian
• There is more to quantum interferometry than entanglement
• Effects of cavity-cavity interaction on the entanglement dynamics of a generalized double Jaynes-Cummings model
• Experimentally freezing quantum discord in a dissipative environment using dynamical decoupling
• In situ upgrade of quantum simulators to universal computers
• Controlling NMR spin systems for quantum computation
• Quantum coherence via conditional entropy
• Influence of the external pressure on the quantum correlations of molecular magnets
• Enhancing quantum control by improving shape pulse generation
• Using a Lindbladian approach to model decoherence in two coupled nuclear spins via correlated phase-damping and amplitude damping noise channels
• Dynamics of quantum coherence in Bell-diagonal states under Markovian channels
• Scalable quantum computing model in the circuit-QED lattice with circulator function
• Quantum Coherence Versus Non-Classical Correlations in Optomechanics
• Diagnosing Quantum Phases Using Long-Range Two-Site Quantum Resource Behaviors
• Purification in Rapid Repeated Interaction Systems
• Quantumness and speedup limit of a qubit under transition frequency modulation
• Experimental protection of arbitrary states in a two-qubit subspace by nested Uhrig dynamical decoupling
• Witnessing nonclassical correlations via a single-shot experiment on an ensemble of spins using NMR
• Accessible bounds for general quantum resources
• Generalized approach to quantify correlations in bipartite quantum systems
• Universal freezing of asymmetry
• Frozen condition of quantum coherence
• Detecting Non-Markovianity via Quantified Coherence: Theory and Experiments
• Non-classical correlations between a quantum probe and complex quantum systems in presence of noise