Protecting and enhancing spin squeezing from decoherence using weak measurements

Liao, Xiang-Ping; Man-sheng, Rong; Mao-Fa, Fang

doi:10.1088/1612-202x/aa6dc7

Cited by 13 publications

(10 citation statements)

References 52 publications

(101 reference statements)

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“…Aharonov proposed a potential strategy, the so-called quantum weak measurement (WM). [54][55][56][57][58][59][60][61] The quantum WM virtually applies an uncollapsed partial measurement to guide the coherence of the system. By uncollapsing the quantum state to the ground state, decoherence can be completely suppressed.…”

Section: Reduction Of the Measured Uncertainty Viz Quantum Weak Measmentioning

confidence: 99%

Measurement Uncertainty and Its Connection to Quantum Coherence in an Inertial Unruh–DeWitt Detector

2020

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The dynamic characteristics of measured uncertainty and quantum coherence are explored for an inertial Unruh-DeWitt detector model in an expanding de Sitter space. Using the entropic uncertainty relation, the uncertainty of interest is correlated with the evolving time t, the energy level spacing , and the Hubble parameter H. The investigation shows that, for short time, a strong energy level spacing and small Hubble parameter can result in a relatively small uncertainty. The evolution of quantum coherence versus the evolving time and Hubble parameter, which varies almost inversely to that of the uncertainty, is then discussed, and the relationship between uncertainty and the coherence is explicitly derived. With respect to the l 1 norm of coherence, it is found that the environment for the quantum system considered possesses a strong non-Markovian property. The dynamic behavior of coherence non-monotonously decreases with the growth of evolving time. The dynamic features of uncertainty and coherence in the expanding space with those in flat space are also compared. Furthermore, quantum weak measurement is utilized to effectively reduce the magnitude of uncertainty, which offers realistic and important support for quantum precision measurements during the undertaking of quantum tasks.

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Section: Reduction Of the Measured Uncertainty Viz Quantum Weak Measmentioning

confidence: 99%

Measurement Uncertainty and Its Connection to Quantum Coherence in an Inertial Unruh–DeWitt Detector

2020

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“…Almost all of these protocols consider one particular channel or quantum information processing task and specific class of states. Examples include the effect of weak measurement on feedback control systems [12,13], on spin squeezing [14], and on protection of coherence of qutrit states [15] against decoherence [16][17][18][19][20][21]. Also this strategy has been used to protect various types of quantum correlations in two and multi-particle systems [22][23][24][25][26][27][28][29][30][31][32][33][34] and also on quantum teleportation, quantum dense coding and quantum telecloning in the presence of noise [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Protecting unknown qubit states from decoherence of qubit channels by weak measurement

Heibati

Mani

Faizi

et al. 2022

J. Phys. A: Math. Theor.

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The problem of combating de-coherence by weak measurements has already been studied for the amplitude damping channel and for specific input states. We generalize this to a large four-parameter family of qubit channels and for the average fidelity over all pure states. As a by-product we classify all the qubit channels which have one invariant pure state and show that the parameter manifold of these channels is isomorphic to S^2 × S^1 × S^1 and contains many interesting sub-classes of channels. By tuning the parameter of the weak measurement, we show that it is possible to increase the average input-output fidelity without blocking too many particles to pass through the channel. Quantitative analysis reveals that the increase of average fidelity can be up to 0.3, by blocking less than half of the particles.

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“…That is to say, for weak measurements, the information extracted from the quantum system is deliberately limited, thereby keeping the measured systems state from randomly collapsing towards an eigenstate. Thus, it would be possible to reverse the initial state by some operations [4][5][6][7]. One of the WM-based state protection schemes can be summed up as follows: first, the researcher performs a relevant WM on the interested qubit to reduce the excited state population.…”

Section: Introductionmentioning

confidence: 99%

Entanglement restoration using environment-assisted measurement and quantum measurement reversal

Qiong

2020

Laser Phys.

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Based on the quantum technique of environment-assisted measurement and quantum measurement reversal, we systematically investigate the restoration of quantum entanglement for distributing a two-qubit pure state via three typical kinds of noisy quantum channelsamplitude damping, phase damping and depolarizing quantum channels. Special attention is paid to the unsymmetrical two-qubit arbitrarily entangled states transmission. The analytical or numerical simulations results show that for arbitrarily one-qubit entangled state or twoqubit states transmission, the output distant entanglement could be drastically restored to the initial value in all these three cases.

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Protecting and enhancing spin squeezing from decoherence using weak measurements

Cited by 13 publications

References 52 publications

Measurement Uncertainty and Its Connection to Quantum Coherence in an Inertial Unruh–DeWitt Detector

Measurement Uncertainty and Its Connection to Quantum Coherence in an Inertial Unruh–DeWitt Detector

Protecting unknown qubit states from decoherence of qubit channels by weak measurement

Entanglement restoration using environment-assisted measurement and quantum measurement reversal

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