Dephasing of Single-Photon Orbital Angular Momentum Qudit States in Fiber: Limits to Correction via Dynamical Decoupling

Gupta, Manish K.; Dowling, Jonathan P.

doi:10.1103/physrevapplied.5.064013

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…The growing number of measurements could pose a limitation for real-time error correction applications involving high-dimensional states. Moreover, there are other methods that can suppress decoherence-related noise, such as error-rejection coding [37], decoherence-free subspaces [38], or dynamical decoupling [39]. These topics are subject to ongoing research.…”

Section: Resultsmentioning

confidence: 99%

Protecting the orbital angular momentum of photonic qubits using quantum error correction

Zhu

Yin

Wang

et al. 2020

EPL

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Photons with orbital angular momentum provide an infinite-dimensional Hilbert space. Here, we study the propagation of such photons in atmospheric turbulence and obtain the Kraus operator representation for the decoherence-induced noise. We apply quantum error correction to suppress this decoherence. Specifically, we treat correction as an optimization problem in which the distance between the actual channel and the desired channel is minimized. This method provides significant channel fidelity enhancement irrespective of the turbulence strength.

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Section: Resultsmentioning

confidence: 99%

Protecting the orbital angular momentum of photonic qubits using quantum error correction

Zhu

Yin

Wang

et al. 2020

EPL

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“…As is hopefully clear from the discussion, this encoding-decoding scheme does not aim at retrieving the state. It serves to determine the values of invariant quantities, that too without consuming any additional resource like multiparty entanglement and sophisticated experimental techniques (like repeated interventions at precise time intervals 41 ).…”

Section: Idea Advanced In This Workmentioning

confidence: 99%

Combating errors in quantum communication: an integrated approach

Bala

Asthana

Ravishankar

2023

Sci Rep

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Near-term quantum communication protocols suffer inevitably from channel noises, whose alleviation has been mostly attempted with resources such as multiparty entanglement or sophisticated experimental techniques. Generation of multiparty higher dimensional entanglement is not easy. This calls for exploring realistic solutions which are implementable with current devices. Motivated particularly by the difficulty in generation of multiparty entangled states, in this paper, we have investigated error-free information transfer with minimal requirements. For this, we have proposed a new information encoding scheme for communication purposes. The encoding scheme is based on the fact that most noisy channels leave some quantities invariant. Armed with this fact, we encode information in these invariants. These invariants are functions of expectation values of operators. This information passes through the noisy channel unchanged. Pertinently, this approach is not in conflict with other existing error correction schemes. In fact, we have shown how standard quantum error-correcting codes emerge if suitable restrictions are imposed on the choices of logical basis states. As applications, for illustration, we propose a quantum key distribution protocol and an error-immune information transfer protocol.

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“…A technique for minimizing the quantum noise is called dynamical decoupling. The application of dynamical decoupling in an optical fiber to reduce quantum noise was first proposed by Wu and Lidar in [22], and later investigated in [23][24][25][26][27] for the protection of photonic qubits traveling in an optical fiber. Although dynamical decoupling has been used to preserve the state of a qubit, it has never been applied for reduction of noise in an AC signal in an optical fiber.…”

Section: Optical Magnetometerymentioning

confidence: 99%

High precision Optical AC Magnetometry using Dynamical Decoupling

Gupta,

Kunjummen,

Wang

et al. 2018

Preprint

Self Cite

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We propose a magnetometer for the precise measurement of AC magnetic fields that uses a Terbium-doped optical fiber with half-waveplates built into it at specified distances. Our scheme uses an open-loop quantum control technique called dynamical decoupling to reduce the noise floor and thus increase the sensitivity. We show that dynamical decoupling is extremely effective in preserving the photon state evolution due to the external AC magnetic field from random birefringence in the fiber, even when accounting for errors in pulse timing. Hence we achieve high sensitivity. For a given inter-waveplate distance, the minimum detectable field is inversely proportional to fiber length, as is the bandwidth of detectable frequencies.

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Dephasing of Single-Photon Orbital Angular Momentum Qudit States in Fiber: Limits to Correction via Dynamical Decoupling

Cited by 6 publications

References 29 publications

Protecting the orbital angular momentum of photonic qubits using quantum error correction

Protecting the orbital angular momentum of photonic qubits using quantum error correction

Combating errors in quantum communication: an integrated approach

High precision Optical AC Magnetometry using Dynamical Decoupling

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