Protecting and Enhancing Spin Squeezing via Continuous Dynamical Decoupling

Abstract

Realizing useful quantum operations with high fidelity is a two-task quantum control problem wherein decoherence is to be suppressed and desired unitary evolution is to be executed. The dynamical decoupling (DD) approach to decoherence suppression has been fruitful but synthesizing DD fields with certain quantum control fields may be experimentally demanding. In the context of spin squeezing, here we explore an unforeseen possibility that continuous DD fields may serve dual purposes at once. In particular, it is shown that a rather simple configuration of DD fields can suppress collective decoherence and yield a 1/N scaling of the squeezing performance (N is the number of spins), thus making spin squeezing more robust to noise and much closer to the so-called Heisenberg limit. The theoretical predictions should be within the reach of current spin squeezing experiments.

5 pages, 5 figures, submitting to PRA

References in corpus (33)

• Quantum-enhanced measurements: beating the standard quantum limit
• Entanglement detection
• Optical Magnetometry
• Dynamical suppression of decoherence in two-state quantum systems
• Nonlinear atom interferometer surpasses classical precision limit
• Atom chip based generation of entanglement for quantum metrology
• Quantum spin squeezing
• Keeping a Quantum Bit Alive by Optimized $\pi$-Pulse Sequences
• Optimized Dynamical Decoupling in a Model Quantum Memory
• Universal Control of Decoupled Quantum Systems
• Entanglement in a second order quantum phase transition
• Finite-Size Scaling Exponents of the Lipkin-Meshkov-Glick Model
• Dynamically Error-Corrected Gates for Universal Quantum Computation
• Characterizing the entanglement of symmetric many-particle spin-1/2 systems
• Control of decoherence: analysis and comparison of three different strategies
• Arbitrarily Accurate Dynamical Control in Open Quantum Systems
• Robustness of Multi-Party Entanglement
• Spin squeezing: transforming one-axis-twisting into two-axis-twisting
• Preserving qubit coherence by dynamical decoupling
• Sudden vanishing of spin squeezing under decoherence
• High-order noise filtering in nontrivial quantum logic gates
• Continuously decoupling single-qubit operations from a perturbing thermal bath of scalar bosons
• Atom correlations and spin squeezing near the Heisenberg limit: finite system size effect and decoherence
• Protection of quantum systems by nested dynamical decoupling
• Protecting unknown two-qubit entangled states by nesting Uhrig's dynamical decoupling sequences
• Decoherence control: Universal protection of two-qubit states and two-qubit gates using continuous driving fields
• Protection of entanglement from sudden death using continuous dynamical decoupling
• Universal dynamical decoupling of multiqubit states from environment
• Universal Dynamical Decoupling: Two-Qubit States and Beyond
• Sub-Shot-Noise Magnetometry with a Correlated Spin-Relaxation Dominated Alkali-Metal Vapor
• Optimized pulses for the perturbative decoupling of spin and decoherence bath
• Dissipation-induced squeezing
• Frequency modulated pulses for quantum bits coupled to time-dependent baths

Cited by in corpus (13)

• Amplification and suppression of system-bath correlation effects in an open many-body system
• Spin squeezing by one-photon-two-atom excitations processes in atomic ensembles
• Dynamical Spin Squeezing via Higher Order Trotter-Suzuki Approximation
• Dephasing-assisted parameter estimation in the presence of dynamical decoupling
• Creating a tunable spin squeezing via a time-dependent collective atom-photon coupling
• Fitting magnetic field gradient with Heisenberg-scaling accuracy
• Random Control over Quantum Open Systems
• Protecting and enhancing spin squeezing under decoherence using weak measurement
• Continuous dynamical decoupling of spin chains: modulating the spin-environment and spin-spin interactions
• Power-law growth of time and strength of squeezing near quantum critical point
• Decoherence mitigation for geometric quantum computation
• Transforming spin chains with a continuous driving field
• Protecting spin squeezing from decoherence