Entanglement-based linear-optical qubit amplifier

Meyer-Scott, Evan; Bula, Marek; Bartkiewicz, Karol; Cernoch, A; Soubusta, Jan; Jennewein, Thomas; Lemr, Karel

doi:10.1103/physreva.88.012327

Cited by 54 publications

(86 citation statements)

References 49 publications

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“…So far, only perfect amplifiers (ρ Q =ρ Q ) have been discussed in the literature. In this paper, we extend the analysis of our previously published scheme [28] to the general case of imperfect amplification (ρ Q =ρ Q ). This paper is organized as follows: In Sec.…”

Section: Introductionmentioning

confidence: 87%

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State-dependent linear-optical qubit amplifier

2013

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We propose a linear-optical setup for heralded qubit amplification with tunable output qubit fidelity. We study its success probability as a function of output qubit fidelity showing that at the expense of lower fidelity, the setup can considerably increase probability of successful operation. These results are subsequently applied in a proposal for state dependent qubit amplification. Similarly to state-dependent quantum cloning, the a priori information about the input state allows to optimize the qubit amplification procedure to obtain better fidelity versus success probability trade-off.Comment: 8 pages, 7 figure

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Section: Introductionmentioning

confidence: 87%

“…However, for no a priori knowledge about the input state κ = 0, the setup provides the same functionality as a previously published qubit amplifier [28]. In this sense, the setup covers the transition between these two conceptually different devices.…”

Section: A Merit Functionmentioning

confidence: 98%

State-dependent linear-optical qubit amplifier

2013

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“…[9] (it provides higher success probability than the scheme proposed in Ref. [3]) with the CBALO( = 0.5) implemented within the framework of linear optics and using hybrid quantum-classical cloning for = 0.5.…”

Section: Comparison With Heralded Amplifiermentioning

confidence: 99%

“…The heralded amplifier and its improvments (see, eg., Ref. [7]) or alternarive schemes using entanglement [8][9][10] have been demonstrated to be useful especially in the * bark@amu.edu.pl context of quantum key distribution. Interesingly the improved qubit amplifier described in Ref.…”

Section: Introductionmentioning

confidence: 99%

Efficient amplification of photonic qubits by optimal quantum cloning

et al. 2014

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We demonstrate that a phase-independent quantum amplifier of a polarization qubit is a complementary amplifier of the heralded qubit amplifier [N. Gisin, S. Pironio and N. Sangouard, Phys. Rev. Lett.105, 070501 (2010)]. It employs the multi-functional cloner in 1 → 2 copying regime, capable of providing approximate copies of qubits given by various probability distributions, and is optimized for distributions with axial symmetry. Direct applications of the proposed solution are possible in quantum technologies, doubling the range where quantum information is coherently broadcast. It also outperforms natural nonlinear amplifiers that use stimulated emission in bulk nonlinear materials. We consider the amplifier to be an important tool for amplifying quantum information sent via quantum channels with phase-independent damping.

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“…In the context of entangled systems, loss represents a fundamental limit for the detection loophole-free Bell test [18][19][20] needed for device-independent quantum key distribution (DI-QKD) [21]. Heralded amplification has been proposed as a means to overcome loss in the critical case of DI-QKD [22][23][24]. More generally, it can also be seen as an entanglement distillation protocol, whereby the herald for the amplifier announces, or selects, a subset of states that have a higher degree of entanglement than before.…”

Section: Introductionmentioning

confidence: 99%

Heralded amplification of path entangled quantum states

Monteiro

Verbanis

Vivoli

et al. 2017

Quantum Sci. Technol.

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Device-independent quantum key distribution (DI-QKD) represents one of the most fascinating challenges in quantum communication, exploiting concepts of fundamental physics, namely Bell tests of nonlocality, to ensure the security of a communication link. This requires the loophole-free violation of a Bell inequality, which is intrinsically difficult due to losses in fibre optic transmission channels. Heralded photon amplification is a teleportation-based protocol that has been proposed as a means to overcome transmission loss for DI-QKD. Here we demonstrate heralded photon amplification for path entangled states and characterise the entanglement before and after loss by exploiting a recently developed displacement-based detection scheme. We demonstrate that by exploiting heralded photon amplification we are able to reliably maintain high fidelity entangled states over loss-equivalent distances of more than 50 km.

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Entanglement-based linear-optical qubit amplifier

Cited by 54 publications

References 49 publications

State-dependent linear-optical qubit amplifier

State-dependent linear-optical qubit amplifier

Efficient amplification of photonic qubits by optimal quantum cloning

Heralded amplification of path entangled quantum states

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