Quantum Zeno subspaces by repeated multi-spin projections

Abstract

Repeated observations inhibit the coherent evolution of quantum states through the quantum Zeno effect. In multi-qubit systems this effect provides new opportunities to control complex quantum states. Here, we experimentally demonstrate that repeatedly projecting joint observables of multiple spins creates coherent quantum Zeno subspaces and simultaneously suppresses dephasing caused by the environment. We encode up to two logical qubits in these subspaces and show that the enhancement of the dephasing time with increasing number of projections follows a scaling law that is independent of the number of spins involved. These results provide new insights into the interplay between frequent multi-spin measurements and non-Markovian noise and pave the way for tailoring the dynamics of multi-qubit systems through repeated projections.

References in corpus (13)

• An Open-System Quantum Simulator with Trapped Ions
• Universal dynamical decoupling of a single solid-state spin from a spin bath
• High-fidelity projective readout of a solid-state spin quantum register
• Unconditional quantum teleportation between distant solid-state qubits
• Confining the state of light to a quantum manifold by engineered two-photon loss
• Demonstration of entanglement-by-measurement of solid state qubits
• Coherent quantum dynamics in steady-state manifolds of strongly dissipative systems
• On experimental procedures for entanglement verification
• Quantum dynamics of an electromagnetic mode that cannot contain N photons
• Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing
• Quantum Computing in Plato's Cave
• Experimental quantum Zeno effect in NMR with entanglement-based measurement
• Experimental protection against evolution of states in a subspace via a super-Zeno scheme on an NMR quantum information processor

Cited by in corpus (27)

• A 10-qubit solid-state spin register with quantum memory up to one minute
• Entanglement Distillation between Solid-State Quantum Network Nodes
• One-second coherence for a single electron spin coupled to a multi-qubit nuclear-spin environment
• Measurement-induced dynamics of many-body systems at quantum criticality
• Dephasing mechanisms of diamond-based nuclear-spin memories for quantum networks
• Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy Center
• Coherence and entanglement of inherently long-lived spin pairs in diamond
• Generalized Adiabatic Theorem and Strong-Coupling Limits
• Multipartite entanglement generation and contextuality tests using non-destructive three-qubit parity measurements
• Quantum Zeno and anti-Zeno effects in quantum dissipative systems
• Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space
• Quantum Zeno effect and nonclassicality in a PT symmetric system of coupled cavities
• Sensing coherent dynamics of electronic spin clusters in solids
• Criterion for quantum Zeno and anti-Zeno effects
• Experimental and theoretical analysis of noise strength and environmental correlation time for ensembles of nitrogen-vacancy centers in diamond
• Purification of an unpolarized spin ensemble into entangled singlet pairs
• Realization of hierarchical equations of motion from stochastic perspectives
• Efficient detection of inhomogeneous magnetic fields from a single spin with Dicke states
• Quantum Zeno effect under continuous spin noise measurement in a quantum dot-micropillar cavity
• Optimal Measurement Protocols in Quantum Zeno Effect
• Kondo-Zeno crossover in the dynamics of a monitored quantum dot
• Non-classical measurement statistics induced by a coherent spin environment
• Macroscopic Zeno effect in Su-Schrieffer-Heeger photonic topological insulator
• Multidimensional spectroscopy of nuclear spin clusters in diamond
• Experimental quantum decoherence control by dark states of the environment
• Non-Hermitian interaction of a discrete state with a continuum
• Quantum Zeno dynamics of a matter-wave bright soliton