Measurement-assisted quantum communication in spin channels with dephasing

Bayat, Abolfazl; Omar, Yasser

doi:10.1088/1367-2630/17/10/103041

Cited by 23 publications

(37 citation statements)

References 62 publications

(76 reference statements)

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“…Refs. [72,73] have shown that the dephasing due to random energy fluctuations induced on qubit levels by random magnetic and electric fields in the environment is one of the challenges in real experiments when the number of spins increases. Moreover, there may also exist decoherence like bit-flip.…”

Section: Performance In Decoherence Environmentmentioning

confidence: 99%

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Robust Generation of Logical Qubit Singlet States with Reverse Engineering and Optimal Control with Spin Qubits

et al. 2020

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A protocol is proposed to generate singlet states of three logical qubits constructed by pairs of spins. Single and multiple operations of logical qubits are studied for the construction of an effective Hamiltonian, with which robust control fields are derived with invariant-based reverse engineering and optimal control. Moreover, systematic errors are further compensated by periodic modulation for better robustness. Furthermore, resistance to random noise and decoherence of the protocol is also shown with numerical simulations. Therefore, the protocol may provide useful perspectives for the generation of logical qubit entanglement in spin systems.

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Section: Performance In Decoherence Environmentmentioning

confidence: 99%

“…Moreover, there may also exist decoherence like bit-flip. [11,13] If, we consider the decoherence model containing both bit-flip and dephasing with equal probability, the evolution of the system can be described by the master equation [11,13,72] (t) = i[ (t),…”

Section: Performance In Decoherence Environmentmentioning

confidence: 99%

Robust Generation of Logical Qubit Singlet States with Reverse Engineering and Optimal Control with Spin Qubits

et al. 2020

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“…In the case of no dissipative processes, where γ = 0, above Hamiltonian can be reduced to an effective Hamiltonian [32] as follows…”

Section: No Dissipative Processesmentioning

confidence: 99%

“…Here, excitations of the encoding qubits leak to the dissipative channel and so lead to decrease the amounts of entanglement. Following the similar protocol introduced in [32] for state transfer, we introduce the regular measurements on the channel to preserve the leakage of excitations. The corresponding projection operators are…”

Section: Effect Of Dissipation and Regular Measurementmentioning

confidence: 99%

Measurement enhances long-distance entanglement generation in spin chains with dissipative processes

Rafiee

2018

Eur. Phys. J. D

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In this paper, effects of the regular measurements on a noisy channel has been investigated. The strategy introduced by A. Bayat, and Y. Omar [New J. Phys. 17, 103041 (2015)] is followed to suppress dephasing and dissipation effects in a noisy spin channel and generate long distance entanglement by global measurement on the channel. A regular global measurements performed on spin channel weakly coupled to the sender and receiver qubits via XX interaction. This scheme is applied for the dephasing and dissipation in non-zero temperature processes separately and the results show that amounts of achieved entanglement enhanced rather than the no-measurement approach.

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“…The fundamental tests for the validity of quantum mechanics, such as the violation of Bell [1,2] and Legett-Garg [3] inequalities are based on quantum measurements. Moreover, they are crucial ingredients of almost all emerging quantum technologies such as quantum teleportation [4], measurementbased quantum computation [5], fault-tolerant quantum computation [6] and spin-chain quantum communication [7][8][9].…”

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confidence: 99%

Measurement Quench in Many-Body Systems

et al. 2018

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Measurement is one of the key concepts which discriminates classical and quantum physics. Unlike classical systems, a measurement on a quantum system typically alters it drastically as a result of wave function collapse. Here we suggest that this feature can be exploited for inducing quench dynamics in a many-body system while leaving its Hamiltonian unchanged. Importantly, by doing away with dedicated macroscopic devices for inducing a quench-using instead the indispensable measurement apparatus only-the protocol is expected to be easier to implement and more resilient against decoherence. By way of various case studies, we show that our scheme also has decisive advantages beyond reducing decoherence-for spectroscopy purposes and probing nonequilibrium scaling of critical and quantum impurity many-body systems. DOI: 10.1103/PhysRevLett.121.030601 Introduction.-Measurement is a fundamental concept that discriminates between the classical and quantum worlds. While in the classical regime measurement is noninvasive with no effect on the system, in the quantum domain, however, acquiring information, even through a local measurement, comes at the cost of an abrupt wavefunction collapse that affects the entire system. The fundamental tests for the validity of quantum mechanics, such as the violation of Bell [1,2] and Legett-Garg [3] inequalities are based on quantum measurements. Moreover, they are crucial ingredients of almost all emerging quantum technologies such as quantum teleportation [4], measurementbased quantum computation [5], fault-tolerant quantum computation [6] and spin-chain quantum communication [7][8][9].All quantum protocols consist of preparation, manipulation, and readout of one or more particles. While preparation and manipulation can be achieved by different means, the readout is unequivocally accomplished by measurements. Experimentally, these all rely on macroscopic devices which may induce decoherence and increase the complexity of the process. This raises the following question: Is it possible to simplify the whole process by keeping only the indispensable part of the macroscopic devices, i.e., the measurement apparatus, for the complete preparation and manipulation of the system?To answer the question, one should first recall that a key task of any quantum protocol is to induce the "right" kind of dynamics on a system. A particularly important class is that of quench dynamics, where the time evolution is induced in

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Measurement-assisted quantum communication in spin channels with dephasing

Cited by 23 publications

References 62 publications

Robust Generation of Logical Qubit Singlet States with Reverse Engineering and Optimal Control with Spin Qubits

Robust Generation of Logical Qubit Singlet States with Reverse Engineering and Optimal Control with Spin Qubits

Measurement enhances long-distance entanglement generation in spin chains with dissipative processes

Measurement Quench in Many-Body Systems

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