Deterministic photon entangler using a charged quantum dot inside a microcavity

Hu, C. Y.; Munro, William J.; Rarity, John

doi:10.1103/physrevb.78.125318

Cited by 204 publications

(285 citation statements)

References 44 publications

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“…In this spin-cavity unit, there exists significant phase difference in the reflection coefficients between the "hot" and the "cold" cavity or between two circular polarizations of the input photons [21]. This GFR effect is a macroscopic manifestation of the optical spin selection rule of charged excitons [29] [see Fig.…”

Section: Linear and Nonlinear Gfr In Type-i Spin-cavity Systemmentioning

confidence: 99%

“…We consider such a charged QD embedded in a single-sided optical microcavity or nanocavity with the one end mirror partially reflective and another one 100% reflective [21]. The external light couples the system via the partially reflective end mirror.…”

Section: Linear and Nonlinear Gfr In Type-i Spin-cavity Systemmentioning

confidence: 99%

“…Quantum gates are the key components for quantum information processing in an analog to the classical gates for classical information processing. To design deterministic quantum gates, three types of interactions can be exploited, i.e., photon-photon interactions [10][11][12], spin-spin interactions [13][14][15][16][17][18], and photon-spin interactions [19][20][21][22][23][24]. Although photons do not interact directly with each other intrinsically, photon-photon indirect interactions mediated by cavity QED have been demonstrated but are by definition nonlinear phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…Exploiting the cavity-QED enhanced photon-spin interactions, in our previous work we proposed two types of photon-spin entangling gates consisting of a single charged QD in an optical micro-or nanocavity for both quantum and classical information processing with high speed (tens to hundreds GHz) as well as for spin memory with heralded feature and unity efficiency [21,22,24]. The two types of photon-spin entangling gates are based on the giant optical Faraday rotation (GFR) and giant optical circular birefringence (GCB), which are induced by the single QD-confined spin in the cavity.…”

Section: Introductionmentioning

confidence: 99%

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Extended linear regime of cavity-QED enhanced optical circular birefringence induced by a charged quantum dot

Rarity

2015

Phys. Rev. B

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms PHYSICAL REVIEW B 91, 075304 (2015) Extended linear regime of cavity-QED enhanced optical circular birefringence induced by a charged quantum dot Giant optical Faraday rotation (GFR) and giant optical circular birefringence (GCB) induced by a single quantum-dot spin in an optical microcavity can be regarded as linear effects in the weak-excitation approximation if the input field lies in the low-power limit [Hu et al., Phys. Rev. B 78, 085307 (2008); 80, 205326 (2009)]. In this work, we investigate the transition from the weak-excitation approximation moving into the saturation regime comparing a semiclassical approximation with the numerical results from a quantum optics toolbox [Tan, J. Opt. B 1, 424 (1999)]. We find that the GFR and GCB around the cavity resonance in the strong-coupling regime are input field independent at intermediate powers and can be well described by the semiclassical approximation. Those associated with the dressed state resonances in the strong-coupling regime or merging with the cavity resonance in the Purcell regime are sensitive to input field at intermediate powers, and cannot be well described by the semiclassical approximation due to the quantum-dot saturation. As the GFR and GCB around the cavity resonance are relatively immune to the saturation effects, the rapid readout of single-electron spins can be carried out with coherent state and other statistically fluctuating light fields. This also shows that high-speed quantum entangling gates, robust against input power variations, can be built exploiting these linear effects.

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Section: Linear and Nonlinear Gfr In Type-i Spin-cavity Systemmentioning

confidence: 99%

Section: Linear and Nonlinear Gfr In Type-i Spin-cavity Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Extended linear regime of cavity-QED enhanced optical circular birefringence induced by a charged quantum dot

Rarity

2015

Phys. Rev. B

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“…Optical measurements have demonstrated spin preparation [1, 2] coherent spin control [3] and electron-spin − photon entanglement [4,5]. There are also proposals for achieving photon entanglement [6] and non-destructive measurement of photons [7] using charged QDs. However, the time evolution of the carrier spin is unavoidably affected by the 10 4 − 10 5 nuclei in the dot, all with non-zero spin.…”

Section: Pacs Numbersmentioning

confidence: 99%

Polarization-correlated photons from a positively charged quantum dot

Cao

Bennett²,

Farrer³

et al. 2015

Phys. Rev. B

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Polarized cross-correlation spectroscopy on a quantum dot charged with a single hole shows the sequential emission of photons with common circular polarization. This effect is visible without magnetic field, but becomes more pronounced as the field along the quantization axis is increased. We interpret the data in terms of electron dephasing in the X + state caused by the Overhauser field of nuclei in the dot. We predict the correlation timescale can be increased by accelerating the emission rate with cavity-QED. PACS numbers:Spins in quantum dots (QDs) provide a promising platform for manipulating and storing quantum information in the solid state. Optical measurements have demonstrated spin preparation [1, 2] coherent spin control [3] and electron-spin − photon entanglement [4,5]. There are also proposals for achieving photon entanglement [6] and non-destructive measurement of photons [7] using charged QDs. However, the time evolution of the carrier spin is unavoidably affected by the 10 4 − 10 5 nuclei in the dot, all with non-zero spin. One example of the utility of the electron-nuclear interaction is its use in spin pumping the hole into the spin down state in zero external field, by pumping on the spin up state of X + [2]. From a fundamental point of view then, the hyperfine interaction provides an interesting system for manipulating a mesoscopic nuclear ensemble and observing its dynamics.It has now been established that the electron-nuclear hyperfine interaction is dominated by the contact interaction and is isotropic in a QD [8]. The dynamics of this interaction manifests itself in studies of polarized photo-luminescence [9,10]. Contrastingly, the hole's plike wave-function has a node at each nucleus leaving the dipole-dipole interaction between the hole and nuclear spins to dominate [11]. This interaction has a strength one order of magnitude below that of the electron [12,13]. Thus, there has been interest in using the hole-spin as quantum bit with reduced decoherence. Direct measurements of the hole spin relaxation time in a vertical magnetic field, T h 1 , have shown it is hundreds of microseconds [2,14]. Without applied magnetic field some experiments suggest the hole spin T h 1 time is 13 ns [8]. Several studies have now estimated the hole dephasing time, T h 2 in magnetic field is approximately 1 µs [3,17].We study here the emission from the X + state in a dot deterministically charged with a hole using a diode * Electronic address: anthony.bennett@crl.toshiba.co.uk ( Figure 1a). We show photons from this transition display polarization correlation over a timescale one order of magnitude greater than the radiative lifetime when excited by a linearly polarized laser. This time is short relative to some reports of the hole spin polarization lifetime [14] and we show that this is a result of dephasing caused by the electron when the system is excited. We investigate the magnitude of the effect as a function of applied external magnetic field and radiative lifetime. The X + consists of two holes in a...

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Three‐Photon Polarization‐Spatial Hyperparallel Quantum Fredkin Gate Assisted by Diamond Nitrogen Vacancy Center in Optical Cavity

et al. 2018

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The construction of a near-deterministic photonic hyperparallel quantum Fredkin (hyper-Fredkin) gate is investigated for a three-photon system with the optical property of a diamond nitrogen vacancy center embedded in an optical cavity (cavity-NV center system). This hyper-Fredkin gate can be used to perform double Fredkin gate operations on both the polarization and spatial-mode degrees of freedom (DOFs) of a three-photon system with a near-unit success probability, compared with those on the double three-photon systems in one DOF. In this proposal, the hybrid quantum logic gate operations are the key elements of the hyper-Fredkin gate, and only two cavity-NV center systems are required. Moreover, the possibility of constructing a high-fidelity and high-efficiency hyper-Fredkin gate in the experimental environment of a cavity-NV center system is discussed, which may be used to implement high-fidelity photonic computational tasks in two DOFs with a high efficiency.and three-photon quantum entangling gates are essential elements for solving universal quantum computational tasks. [1][2][3][4][5][6][7][8][9][10] In the construction of photonic quantum entangling gates, the strong interaction between photons is an essential task to be overcome. By using linear optics, auxiliary photons, and photon detectors, the strong photonphoton interaction can be obtained, and many schemes have been proposed and demonstrated for photonic twoqubit [11][12][13] and three-qubit [14,15] quantum entangling gates in the past few years. In 2006, Fiurášek [14] proposed a threephoton Fredkin gate with the success probability 4.1 × 10 −3 by using linear optical elements, auxiliary entangled photon pairs, and the single-photon detectors. In 2008, Gong et al. [15] improved the success probability of three-photon Fredkin gate to 1/64 by using linear optical elements and the three-photon time entangled source.The near-deterministic photonic quantum entangling gates have been investigated with nonlinear optical elements, [16][17][18][19][20][21][22][23][24] such as the two-photon controlled-not (CNOT) gate with cross-Kerr nonlinearity [16] and two-photon controlled-phase-flip (CPF) gate with cavity quantum electrodynamics (QED). [17] The interaction between dipole-emitter and photon in cavity QED is very useful for obtaining strong interaction between photons. The electron-spins in quantum dot [25][26][27][28][29] and nitrogen vacancy (NV) center in diamond [30][31][32][33][34][35][36][37] are promising dipole-emitters for cavity QED. With the optical property of quantum dot (or NV center in diamond) embedded in optical cavity, the quantum entangling gates can be constructed for photon systems [19,20,27] and photonelectron-spin hybrid systems. [36,37] Considering the high-capacity property, the photon system can carry more quantum information by encoding the multiple degrees of freedom (DOFs) as qubits. In quantum communication, the entanglement can be prepared in the multiple DOFs of photon system, called hyperentanglement, [38] which can larg...

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Deterministic photon entangler using a charged quantum dot inside a microcavity

Cited by 204 publications

References 44 publications

Extended linear regime of cavity-QED enhanced optical circular birefringence induced by a charged quantum dot

Extended linear regime of cavity-QED enhanced optical circular birefringence induced by a charged quantum dot

Polarization-correlated photons from a positively charged quantum dot

Three‐Photon Polarization‐Spatial Hyperparallel Quantum Fredkin Gate Assisted by Diamond Nitrogen Vacancy Center in Optical Cavity

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