Generation of an entangled four-photon<i>W</i>state

Zou, Xu‐Bo; Pahlke, K.; Mathis, Wolfgang

doi:10.1103/physreva.66.044302

Cited by 142 publications

(113 citation statements)

References 36 publications

Supporting

Mentioning

112

Contrasting

Order By: Relevance

“…As will be shown, the resulting setup is closely related to an earlier proposal by Sliwa and Banaszek that relies on triple-pair emission from a single down-conversion source [13]. Other related work includes proposals for generating heralded two-photon polarization entanglement from multiple sources of single photons [14,15,16], and methods for generating heralded photonic "path-entanglement" from single-photon sources [17] or down-converted photon pairs [18,19,20].…”

mentioning

confidence: 86%

Heralded two-photon entanglement from probabilistic quantum logic operations on multiple parametric down-conversion sources

Pittman

Donegan

Fitch

et al. 2003

IEEE J. Select. Topics Quantum Electron.

View full text Add to dashboard Cite

An ideal controlled-NOT gate followed by projective measurements can be used to identify specific Bell states of its two input qubits. When the input qubits are each members of independent Bell states, these projective measurements can be used to swap the post-selected entanglement onto the remaining two qubits. Here we apply this strategy to produce heralded two-photon polarization entanglement using Bell states that originate from independent parametric down-conversion sources, and a particular probabilistic controlled-NOT gate that is constructed from linear optical elements. The resulting implementation is closely related to an earlier proposal by Sliwa and Banaszek [quant-ph/0207117], and can be intuitively understood in terms of familiar quantum information protocols. The possibility of producing a "pseudo-demand" source of two-photon entanglement by storing and releasing these heralded pairs from independent cyclical quantum memory devices is also discussed.The entanglement of two (or more) particles remains one of the most fascinating aspects of quantum mechanics [1]. In addition to its relevance in a number of fundamental issues [2], quantum entanglement has recently been identified as a valuable resource for a variety of quantum information processing tasks [3]. One promising approach to the practical realization of many of these tasks relies on qubits that are encoded in the polarization states of single photons. Consequently, a reliable source of heralded or even "push-button"[4] two-photon polarization entanglement is of great interest at the present time.One recent suggestion for such a source involves photon-pair production from controlled biexciton emission of a single quantum dot [5,6]. Alternatively, one can consider a source based on the photon-pairs produced in parametric down-conversion [7]. However, the random nature of this spontaneous emission process prohibits the direct use of a single two-photon down-conversion source for the production of on-demand pairs, and schemes based on conventional entanglement swapping [8,9] between two down-conversion sources can lead to false heralding signals due to double pair emission from one of the sources [10]. In fact, Kok and Braunstein have shown that the production of one heralded polarizationentangled photon pair using only conventional downconversion sources, linear optical elements, and projective measurements requires at least three initial pairs [11].In this brief paper, we describe a method for producing heralded two-photon entanglement along theses lines. We consider the use of our previously proposed probabilistic controlled-NOT gate [12], which consumes one entangled photon pair as a resource, to essentially perform an entanglement swapping procedure on two additional entangled photon pairs. The end result is a unique detection signature of four photons that heralds the presence of one remaining polarization-entangled pair, with a potentially negligible probability of false heralding due to undesired multiple pair emission from the three i...

show abstract

mentioning

confidence: 86%

Heralded two-photon entanglement from probabilistic quantum logic operations on multiple parametric down-conversion sources

Pittman

Donegan

Fitch

et al. 2003

IEEE J. Select. Topics Quantum Electron.

View full text Add to dashboard Cite

show abstract

“…It was shown recently that these states may be conditionally generated with the help of linear optics, single photon sources and photodetectors [14,15,16,17]. We then combine the modes 1 and 2 on a balanced beam splitter and measure the number of photons in output modes 1 and 2 by means of two photodetectors P D 1 and P D 2 with single-photon resolution.…”

Section: Quantum State Truncationmentioning

confidence: 99%

“…Schemes for probabilistic preparation of Fock states [9], arbitrary superpositions of Fock states of single-mode field [10,11], and superpositions of classically distinguishable states (Schrödinger-cat-like states) [12,13], have been found. Several setups for the generation of twomode N -photon path-entangled states have been suggested [14,15,16,17,18]. Recently, the experimental conditional preparation of a single-photon Fock state with negative Wigner function has been reported [19].…”

Section: Introductionmentioning

confidence: 99%

Conditional generation of arbitrary multimode entangled states of light with linear optics

2003

View full text Add to dashboard Cite

We propose a universal scheme for the probabilistic generation of an arbitrary multimode entangled state of light with finite expansion in Fock basis. The suggested setup involves passive linear optics, single photon sources, strong coherent laser beams, and photodetectors with single-photon resolution. The efficiency of this setup may be greatly enhanced if, in addition, a quantum memory is available.

show abstract

“…Nevertheless, our predicted performance exceeds current state-of-the-art experiments [21] (by more than an order of magnitude) and previous proposals us- ing linear optics. For example, the highest probability [23] of creating an N =6 N 00N state with linear optics is 0.097, assuming perfect on-demand Fock-state sources (12 photons total), perfect optics, and perfect detector efficiency. This level of performance is feasible with our proposal, without these assumptions.…”

mentioning

confidence: 99%

“…This same state can also be used for quantum lithography [22], demonstrating "super resolution". Originally proposed methods [6,23] for creating N 00N states using linear optics scaled exponentially poorly with increasing N, even assuming perfect optics, on-demand Fock-state sources, and detectors. A recent proposal [24] suggests a method for creating N 00N (Fig.…”

mentioning

confidence: 99%

Efficient Optical Quantum State Engineering

McCusker

Kwiat

2009

Phys. Rev. Lett.

View full text Add to dashboard Cite

We discuss a novel method of efficiently producing multi-photon states using repeated spontaneous parametric downconversion. Specifically, by attempting downconversion several times, we can pseudo-deterministically add photons to a mode, producing various several-photon states. We discuss both expected performance and experimental limitations. [4]), reliably and deterministically creating even simple quantum optical states remains a challenge. For example, on-demand singlephoton production is still elusive, despite significant recent progress [5]. More complicated states can often be created probabilistically using single photons, linear optics, and feed-forward, but these schemes typically scale exponentially poorly with the number of photons in the state [6] or are prohibitively complicated [3]. In this letter, we propose a novel method using repeated spontaneous parametric downconversion to closely approximate applying the creation operator, allowing efficient pseudodeterministic preparation of a variety of states, with critical implications for applications including quantum computing and quantum metrology.Spontaneous parametric downconversion (a nonlinear optical process in which one high energy photon in a laser beam splits into a pair of lower energy photons, called the signal and idler) has for many years been the workhorse for producing high quality simple photon states, such as heralded single photons [7] and entangled photons. More recently, four-wave mixing (FWM) has been used to produce these states as well [8,9]. Downconversion has also been used to add a photon to a classical light field, with nonclassical results [10]. However, one of the drawbacks of these approaches is that they are nondeterministic, i.e., the number of pairs of photons that are produced is described by a random (thermal) distribution. One way to overcome this problem and produce single photons deterministically is to monitor the signal mode of several downconversion sources [11], or a single source pulsed at several times [12,13]; this allows one to herald the output of the idler mode without directly measuring it, and then select the source/pulse that produced the desired output. We propose modifying this technique to drive downconversion (or FWM) weakly in a cavity until we produce exactly one pair, thereby deterministically adding a photon to the idler mode. Repeating this process, we can "build up" a desired number state. Furthermore, by manipulating the polarization of the photon that is being added (or equivalently, manipulating the polarization of the pho-PBS DC PC1

show abstract

Generation of an entangled four-photonWstate

Cited by 142 publications

References 36 publications

Heralded two-photon entanglement from probabilistic quantum logic operations on multiple parametric down-conversion sources

Heralded two-photon entanglement from probabilistic quantum logic operations on multiple parametric down-conversion sources

Conditional generation of arbitrary multimode entangled states of light with linear optics

Efficient Optical Quantum State Engineering

Contact Info

Product

Resources

About