Transporting and manipulating single electrons in surface‐acoustic‐wave minima

Ford, C. J. B.

doi:10.1002/pssb.201600658

Cited by 24 publications

(27 citation statements)

References 97 publications

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“…Moreover, if these sources can be electrically triggered at a GHz-repetition rate, an ideal and compact photonic quantum processor may thus be achieved.To try to overcome the issues of the randomness of self-assembled quantum dots and to create integrated onchip photonic quantum networks, a single-photon source can in principle be made in a novel approach combining a single-electron-transport technique with a lateral n-i-p junction, a semiconductor interface between adjacent electron ('n') and hole ('p') regions, formed in a quantum well, with an intrinsic region ('i ') in between (a lateral light-emitting diode). In recent years, control of a propagating single-electron quantum state has been achieved using an electron pump [30], a leviton [31], and a surface acoustic wave (SAW) [32][33][34][35]. If a single electron can be transported from an electron region into a arXiv:1901.03464v1 [cond-mat.mes-hall] 11 Jan 2019 2 FIG.…”

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confidence: 99%

“…The number n of electrons in each SAW potential minimum is well defined if the Coulomb charging energy is large enough. The SAW (of frequency f SAW ) can therefore drive a quantised current nef SAW along the channel (e is the electronic charge) [32,34]. To generate light, single electrons must be carried in SAW potential minima across a lateral n-i-p junction to create single photons by recombining with holes (see Supplementary Video for a simple animation).…”

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Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode

et al. 2020

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Single-photon sources are essential building blocks in quantum photonic networks, where quantum-mechanical properties of photons are utilised to achieve quantum technologies such as quantum cryptography and quantum computing. Most conventional solid-state single-photon sources are based on single emitters such as self-assembled quantum dots, which are created at random locations and require spectral filtering. These issues hinder the integration of a singlephoton source into a scaleable photonic quantum network for applications such as on-chip photonic quantum processors. In this work, using only regular lithography techniques on a conventional GaAs quantum well, we realise an electrically triggered single-photon source with a GHz repetition rate and without the need for spectral filtering. In this device, a single electron is carried in the potential minimum of a surface acoustic wave (SAW) and is transported to a region of holes to form an exciton. The exciton then decays and creates a single photon in a lifetime of ∼ 100 ps. This SAW-driven electroluminescence (EL) yields photon antibunching with g (2) (0) = 0.39 ± 0.05, which satisfies the common criterion for a single-photon source g (2) (0) < 0.5. Furthermore, we estimate that if a photon detector receives a SAW-driven EL signal within one SAW period, this signal has a 79%-90% chance of being a single photon. This work shows that a single-photon source can be made by combining single-electron transport and a lateral n-i-p junction. This approach makes it possible to create multiple synchronised single-photon sources at chosen positions with photon energy determined by quantum-well thickness. Compared with conventional quantum-dot-based single-photon sources, this device may be more suitable for an on-chip integrated photonic quantum network.The development of single-photon sources is important for many quantum information technologies [1][2][3], such as quantum cryptography [4][5][6], quantum communication [7][8][9], quantum metrology [10, 11], and quantum computation [12, 13]. Currently, most high-performance single-photon sources are self-assembled InGaAs-based quantum dots (QDs) [14][15][16]. However, there are several issues that may limit their integration into practical quantum photonic networks [17][18][19][20][21][22][23][24]. Firstly, in conventional growth of self-assembled QDs, the location and size of each QD are quite random. Therefore, one has to rely on statistics to create structures like optical cavities and gates around a quantum dot. This will be an issue for applications that require several deterministicallyfabricated single-photon sources on a compact chip. Secondly, it is hard to precisely control the size of a quantum dot, which will affect the single-photon energy. Hence, it is challenging to make identical QD single-photon sources, which is essential for applications like quantum computation and a quantum repeater [12,25]. Finally, in order to ensure that a neutral exciton is created in every optical or electrical excitation, the e...

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Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode

et al. 2020

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“…The SWAP α quantum gate with 0 1 α < ≤ is one of the most efficient quantum gates in two-qubit quantum computation, with three SWAP α gates combined with six single-qubit gates being able to realize any arbitrary two-qubit unitary operation [47] [48] [49]. The SWAP α gate can be experimentally implemented in several physical systems such as in the exchange interaction between electrons trapped by surface acoustic waves [34] [50]. In our paper, we look at the use of only SWAP α operators for generation of quantum states and our analysis applies to any n-qubit quantum state that can undergo SWAP α operations, where α is any real number.…”

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confidence: 99%

Generation of Quantum Vector States Using the Exchange Interaction

Majumdar¹

2019

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“…While an optical approach may be feasible [10], surface-acoustic waves (SAWs) have recently been used in a range of exciting experiments to trap electrons [11][12][13][14][15] or excitons [16] in moving potentials. When following this approach, however, particles are typically lost on a relatively fast timescale of ∼ 10ns, as a consequence of finite sample sizes and propagation speeds set by the speed of sound to ∼ 3×10 3 m/s.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Traps and Lattices for Electrons in Semiconductors

et al. 2017

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We propose and analyze a solid-state platform based on surface acoustic waves for trapping, cooling, and controlling (charged) particles, as well as the simulation of quantum many-body systems. We develop a general theoretical framework demonstrating the emergence of effective time-independent acoustic trapping potentials for particles in two-or one-dimensional structures. As our main example, we discuss in detail the generation and applications of a stationary, but movable, acoustic pseudolattice with lattice parameters that are reconfigurable in situ. We identify the relevant figures of merit, discuss potential experimental platforms for a faithful implementation of such an acoustic lattice, and provide estimates for typical system parameters. With a projected lattice spacing on the scale of ∼100 nm, this approach allows for relatively large energy scales in the realization of fermionic Hubbard models, with the ultimate prospect of entering the low-temperature, strong interaction regime. Experimental imperfections as well as readout schemes are discussed.

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Transporting and manipulating single electrons in surface‐acoustic‐wave minima

Cited by 24 publications

References 97 publications

Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode

Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode

Generation of Quantum Vector States Using the Exchange Interaction

Acoustic Traps and Lattices for Electrons in Semiconductors

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