Scheme for optimal spin state estimation is considered in analogy with phase detection in interferometry. Recently reported coherent measurements yielding the average fidelity (N+1)/(N+2) for N particle system corresponds to the standard limit of phase resolution 1/\sqrt{N}. It provides the bound for incoherent measurements when each particle is detected separately and information is used optimally. For specific states, improvement up to the value 1/N is possible in quantum theory. The best results are obtained combining sequentially coherent measurements on fractional groups of particles
Total spin eigenstates can be used to intrinsically encode a direction, which can later be decoded b...
We study the estimation of an infinitesimal rotation of a spin-j system, characterized by two unknow...
Recently, Gerry et al. [Phys. Rev. A 79, 022111 (2009)] studied the violation of the Bell-Clauser-Ho...
Coherent states provide an appealing method to reconstruct efficiently a pure state of a quantum mec...
We show how to quantify the optimal tradeoff between the amount of information retrieved by a quantu...
Quantum information theory is applied to practical interferometer-based phase measurements to deduce...
We present the theory of how to achieve phase measurements with the minimum possible variance in way...
The theory of quantum state estimation is exploited here to investigate the most efficient strategie...
Given only a finite ensemble of identically prepared particles, how precisely can one determine thei...
By using a systematic optimization approach, we determine quantum states of light with definite phot...
A quantum theory of multiphase estimation is crucial for quantum-enhanced sensing and imaging and ma...
We provide optimal measurement schemes for estimating relative parameters of the quantum state of a ...
A statistical distinguishability based on relative entropy characterises the fitness of quantum stat...
A quantum theory of multiphase estimation is crucial for quantum-enhanced sensing and imaging and ma...
We study the estimation of an infinitesimal rotation of a spin-j system, characterised by two unknow...
Total spin eigenstates can be used to intrinsically encode a direction, which can later be decoded b...
We study the estimation of an infinitesimal rotation of a spin-j system, characterized by two unknow...
Recently, Gerry et al. [Phys. Rev. A 79, 022111 (2009)] studied the violation of the Bell-Clauser-Ho...
Coherent states provide an appealing method to reconstruct efficiently a pure state of a quantum mec...
We show how to quantify the optimal tradeoff between the amount of information retrieved by a quantu...
Quantum information theory is applied to practical interferometer-based phase measurements to deduce...
We present the theory of how to achieve phase measurements with the minimum possible variance in way...
The theory of quantum state estimation is exploited here to investigate the most efficient strategie...
Given only a finite ensemble of identically prepared particles, how precisely can one determine thei...
By using a systematic optimization approach, we determine quantum states of light with definite phot...
A quantum theory of multiphase estimation is crucial for quantum-enhanced sensing and imaging and ma...
We provide optimal measurement schemes for estimating relative parameters of the quantum state of a ...
A statistical distinguishability based on relative entropy characterises the fitness of quantum stat...
A quantum theory of multiphase estimation is crucial for quantum-enhanced sensing and imaging and ma...
We study the estimation of an infinitesimal rotation of a spin-j system, characterised by two unknow...
Total spin eigenstates can be used to intrinsically encode a direction, which can later be decoded b...
We study the estimation of an infinitesimal rotation of a spin-j system, characterized by two unknow...
Recently, Gerry et al. [Phys. Rev. A 79, 022111 (2009)] studied the violation of the Bell-Clauser-Ho...