Heralded Entanglement of Two Ions in an Optical Cavity

Casabone, Bernardo; Stute, Andreas; Friebe, Konstantin; Brandstätter, B.; Schüppert, Klemens; Blatt, R.; Northup, Tracy E.

doi:10.1103/physrevlett.111.100505

Cited by 83 publications

(73 citation statements)

References 36 publications

(61 reference statements)

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“…Current experimental realizations report coherent transport and controlled positioning of neutral atoms in optical cavities [29,30,42,43], where a dipole trap is used as a conveyor belt to displace them. Two trapped ions have also been reported to be coupled in a controlled way to an optical resonator [27,28]. The cavity can be shifted with respect to ions, allowing to tune the coupling strength between ions and optical cavity.…”

Section: Experimental Constraintsmentioning

confidence: 99%

“…Nevertheless, it is an unambiguous protocol as there are four successful events that lead to postselection of four different Bell states. The scheme is based on basic properties of the two-atom TavisCummings model [26] and on resonant matter-field interactions which are already under experimental investigation [27,28,29,30]. These considerations make our scheme compatible with a quantum repeater or a quantum relay based on coherent multiphoton states, atomic qubits and resonant matter-field interaction.…”

Section: Introductionmentioning

confidence: 99%

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Unambiguous atomic Bell measurement assisted by multiphoton states

2016

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We propose and theoretically investigate an unambiguous Bell measurement of atomic qubits assisted by multiphoton states. The atoms interact resonantly with the electromagnetic field inside two spatially separated optical cavities in a Ramsey-type interaction sequence. The qubit states are postselected by measuring the photonic states inside the resonators. We show that if one is able to project the photonic field onto two coherent states on opposite sites of phase space, an unambiguous Bell measurement can be implemented. Thus our proposal may provide a core element for future components of quantum information technology such as a quantum repeater based on coherent multiphoton states, atomic qubits and matter-field interaction.

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Section: Experimental Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unambiguous atomic Bell measurement assisted by multiphoton states

2016

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“…Although efficient light collection and detector arrays will be necessary for the measurement of many trapped ion qubits through state-dependent fluorescence, it will be crucial for the single-photon linking of ELU modules as discussed above. With high numerical-aperture collection optics, 10% of the emitted photons can be collected, 51 and more could be extracted through an optical cavity 77,78 integrated with the ion trap. 79 Highly efficient photonic Bell-state detectors with near-ideal mode-matching can be realised in fibre or waveguide beamsplitters 80 and near-unit efficiency photon detectors.…”

Section: Integration Technologies For Trapped Ion Quantum Computersmentioning

confidence: 99%

Co-designing a scalable quantum computer with trapped atomic ions

2016

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The first generation of quantum computers are on the horizon, fabricated from quantum hardware platforms that may soon be able to tackle certain tasks that cannot be performed or modelled with conventional computers. These quantum devices will not likely be universal or fully programmable, but special-purpose processors whose hardware will be tightly co-designed with particular target applications. Trapped atomic ions are a leading platform for first-generation quantum computers, but they are also fundamentally scalable to more powerful general purpose devices in future generations. This is because trapped ion qubits are atomic clock standards that can be made identical to a part in 10 15 , and their quantum circuit connectivity can be reconfigured through the use of external fields, without modifying the arrangement or architecture of the qubits themselves. In this forwardlooking overview, we show how a modular quantum computer with thousands or more qubits can be engineered from ion crystals, and how the linkage between ion trap qubits might be tailored to a variety of applications and quantum-computing protocols. Quantum information processors have the potential to perform computational tasks that are difficult or impossible using conventional modes of computing. 1-3 In a radical departure from classical information, the qubits of a quantum computer can simultaneously store bit values 0 and 1, and when measured they probabilistically assume definite states. Many interacting qubits, isolated from their environment, can represent huge amounts of information: there are exponentially many binary numbers that can co-exist, with entangled qubit correlations that can behave as invisible wires between the qubits. Even in the face of Moore's Law, or the doubling in conventional computer power every year or two, the complexity of massively entangled quantum states of just a few hundred qubits can easily eclipse the capacity of classical information processing. 4 There are but a few known applications that exploit this quantum advantage, such as Shor's factoring algorithm, 5 and future quantum information processors will likely be applied to special-purpose applications. On the other hand, a quantum computer has not yet been built; therefore, new quantum applications and algorithms will likely follow from the evolution and capability of quantum hardware.In the 20 years since the advent of Shor's algorithm 5 and the discovery of quantum error correction, 6-8 there has been remarkable progress in demonstrations of entangling quantum gates on o10 qubits in certain physical systems. Current efforts aim to scale to hundreds, thousands or even millions of interacting qubits. Unlike the classical scaling of bits and logic gates, however, large quantum systems are not comparable to the behaviour of just a few qubits. Just because 2 or 4 qubits can be completely controlled with negligible errors does not mean that this system can readily scale to 4100 qubits.In the last few years, two particular quantum hardware platforms have e...

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“…In general,there is a possibility of cavity-photon mediated long-range interaction [9,10,11,12,13,14,15] between atoms. This occurs due to transitions at a singleatom level.…”

Section: Discussionmentioning

confidence: 99%

Manipulating nanoscale atom–atom interactions with cavity QED

Pal

Saha

Deb

2016

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. We theoretically explore manipulation of interactions between excited and ground state atoms at nanoscale separations by cavity quantum electrodynamics (CQED). We develop an adiabatic molecular dressed state formalism and show that it is possible to generate Fano-Feshbach resonances between ground and long-lived excited-state atoms inside a cavity. The resonances are shown to arise due to nonadiabatic coupling near a pseudo-crossing between the dressed state potentials. We illustrate our results with a model study using fermionic 171 Yb atoms in a two-modal cavity. Our study is important for manipulation of interatomic interactions at low energy by cavity field.

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Heralded Entanglement of Two Ions in an Optical Cavity

Cited by 83 publications

References 36 publications

Unambiguous atomic Bell measurement assisted by multiphoton states

Unambiguous atomic Bell measurement assisted by multiphoton states

Co-designing a scalable quantum computer with trapped atomic ions

Manipulating nanoscale atom–atom interactions with cavity QED

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