Experimental demonstration of delayed-choice decoherence suppression

Lee, Jong Chan; Lim, Hyun‐Tae; Hong, Ki-Sang; Jeong, Youn-Chang; Kim, M. S.; Kim, Yoon-Ho

doi:10.1038/ncomms5522

Cited by 27 publications

(15 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Active topics include channel robustness and error sources [15,16], methods for estimating channel capacity [17], and tradeoffs between loss and rate [18] or rate and fidelity [14]. All of these exemplary channels could be effectively simulated with linear optics; for instance, to demonstrate delayed choice decoherence suppression [19], to simulate interactions with a boson bath [20], to measure the capacity of a channel [21], or to probe channel decoherence effects on a qubit in a cluster state [22].…”

Section: Introductionmentioning

confidence: 99%

Tuning quantum channels to maximize polarization entanglement for telecom photon pairs

2018

View full text Add to dashboard Cite

Quantum networks entangle remote nodes by distributing quantum states, which inevitably suffer from decoherence while traversing quantum channels. Pertinent decoherence mechanisms govern the channel capacity, its reach, and the quality and rate of distributed entanglement. Hence recognizing, understanding, and modeling those mechanisms is a crucial step in building quantum networks. Here, we study practical fiber-optic quantum channels that partially filter individual modes of transmitted polarization entangled states and are capable of introducing dephasing. First, we theoretically model and experimentally demonstrate the combined effect of two independent and arbitrarily oriented polarization dependent loss elements experienced by each photon of an entangled photon pair. Then, we showcase the compensation of lost entanglement by properly adjusting the channels' properties and discuss the resulting tradeoff between the entanglement quality and rate. Our results provide insights into the capacity of practical fiber-optics channels, thus taking an important step towards the realization of quantum networks.

show abstract

Section: Introductionmentioning

confidence: 99%

Tuning quantum channels to maximize polarization entanglement for telecom photon pairs

2018

View full text Add to dashboard Cite

show abstract

“…In this line of research, it is essential to avoid or delay the ESD to develop better quantum applications. There are few schemes to protect the entanglement from decoherence such as week measurement in association with quantum measurement reversal [22][23][24][25][26][27][28][29][30], feed back control [31,32], unitary operations [33], delayed choice decoherence suppression [34], dynamical decoupling [35,36] and decoherence free subspace [37,38], quantum zeno effect [39,40] . In general, there is no generalized method to protect ESD in quantum systems.…”

Section: Introductionmentioning

confidence: 99%

Entanglement Sudden Death and Birth Effects in Two Qubits Maximally Entangled Mixed States Under Quantum Channels

Sharma

Gerdt

2019

Int J Theor Phys

View full text Add to dashboard Cite

In the present article, the robustness of entanglement in two qubits maximally entangled mixed states (MEME) have been studied under quantum decoherence channels. Here we consider bit flip, phase flip, bit-phase-flip, amplitude damping, phase damping and depolarization channels. To quantify the entanglement, the concurrence has been used as an entanglement measure. During this study interesting results have been found for sudden death and birth of entanglement under bit flip and bit-phase-flip channels. While amplitude damping channel produces entanglement sudden death and does not allow re-birth of entanglement. On the other hand, two qubits MEMS exhibit the robust character against the phase flip, phase damping and depolarization channels. The elegant behavior of all the quantum channels have been investigated with varying parameter of quantum state MEMS in different cases.

show abstract

“…Several proposals exist to suppress the decoherence; for example, decoherence-free subspaces [16][17][18][19], quantum error correction [20,21], dynamical decoupling [22][23][24], quantum Zeno effect [25][26][27], quantum measurement reversal [28][29][30][31][32][33], and delayed-choice decoherence suppression [34]. Protecting entanglement using weak measurement and quantum measurement reversal [32,33], and delayed choice decoherence suppression [34] have been experimentally demonstrated. Both of these schemes, however, have the limitation that the success probability of decoherence suppression decreases as the strength of the weak interaction increases.The practical question we want to address here is; whether, given a two-qubit entangled state in the presence of amplitude damping channel which causes disentanglement in finite time, can we alter the time of disentanglement by a suitable operation during the process of decoherence?…”

mentioning

confidence: 99%

“…We find that our simulation results for the manipulation of ESD involving NOT operations on one or both the qubits of a polarization entangled photonic system in presence of ADC are completely consistent with the theoretical predictions of the reference [35] which has analyzed an atomic system. The merit of our scheme is that it can delay or avoid ESD (provided the NOT operation is performed sufficiently early) unlike previous experiments [32][33][34] where success probabilities scaled with the strength of the weak interaction. Since the photonic system is time independent and noise is simulated using HWPs, it gives experimentalists complete freedom to study and manipulate the disentanglement dynamics in a controlled manner.…”

mentioning

confidence: 99%

Manipulation of entanglement sudden death in an all-optical setup

et al. 2017

View full text Add to dashboard Cite

The unavoidable and irreversible interaction between an entangled quantum system and its environment causes decoherence of the individual qubits as well as degradation of the entanglement between them. Entanglement sudden death (ESD) is the phenomenon wherein disentanglement happens in finite time even when individual qubits decohere only asymptotically in time due to noise. Prolonging the entanglement is essential for the practical realization of entanglement-based quantum information and computation protocols. For this purpose, the local NOT operation in the computational basis on one or both qubits has been proposed. Here, we formulate an all-optical experimental set-up involving such NOT operations that can hasten, delay, or completely avert ESD, all depending on when it is applied during the process of decoherence. Analytical expressions for these are derived in terms of parameters of the initial state's density matrix, whether for pure or mixed entangled states. After a discussion of the schematics of the experiment, the problem is theoretically analyzed, and simulation results of such manipulations of ESD are presented

show abstract

Experimental demonstration of delayed-choice decoherence suppression

Cited by 27 publications

References 28 publications

Tuning quantum channels to maximize polarization entanglement for telecom photon pairs

Tuning quantum channels to maximize polarization entanglement for telecom photon pairs

Entanglement Sudden Death and Birth Effects in Two Qubits Maximally Entangled Mixed States Under Quantum Channels

Manipulation of entanglement sudden death in an all-optical setup

Contact Info

Product

Resources

About