Quasiparticle engineering and entanglement propagation in a quantum many-body system

Jurcevic, Petar; Lanyon, B. P.; Hauke, Philipp; Hempel, Cornelius; Zoller, P.; Blatt, R.; Roos, C. F.

doi:10.1038/nature13461

Cited by 804 publications

(998 citation statements)

References 39 publications

Supporting

Mentioning

974

Contrasting

Order By: Relevance

“…Jt, 33.80.Gj, 34.50.Lf, Crystals of laser-cooled atomic ions form the basis of many experimental realizations of quantum logic gates [1][2][3] and simulations of quantum many-body physics [4][5][6]. In room-temperature vacuum systems, collisions with neutral background gas molecules limit quantum coherences and quantum logic operations [7].…”

mentioning

confidence: 99%

Reversing hydride-ion formation in quantum-information experiments withBe+

et al. 2015

View full text Add to dashboard Cite

We demonstrate photodissociation of BeH + ions within a Coulomb crystal of thousands of 9 Be + ions confined in a Penning trap. Because BeH + ions are created via exothermic reactions between trapped, laser-cooled Be + ( 2 P 3/2 ) and background H2 within the vacuum chamber, they represent a major contaminant species responsible for infidelities in large-scale trapped-ion quantum information experiments. The rotational-state-insensitive dissociation scheme described here makes use of 157 nm photons to produce Be + and H as products, thereby restoring Be + ions without the need for reloading. This technique facilitates longer experiment runtimes at a given background H2 pressure, and may be adapted for removal of MgH + and AlH + impurities.PACS numbers: 52.27. Jt, 33.80.Gj, 34.50.Lf, Crystals of laser-cooled atomic ions form the basis of many experimental realizations of quantum logic gates [1][2][3] and simulations of quantum many-body physics [4][5][6]. In room-temperature vacuum systems, collisions with neutral background gas molecules limit quantum coherences and quantum logic operations [7]. Here we focus on inelastic (i.e. reactive) collisions where exothermic chemical reactions with background gas molecules can generate, in both Penning and rf traps, co-trapped molecular ions over a wide range of trapping conditions and crystal geometries [6][7][8][9]. These contaminants alter ion-crystal eigenfrequencies and can complicate quantum logic interactions [10]. Impurities may be resonantly ejected from both radiofrequency and Penning traps, but this technique is least efficient when the impurities are similar in mass to the qubit ion [11]. The rate of impurity ion formation increases linearly with the number of ion qubits in the register, and the time required for loading new ions and recalibrating the register increases with the size of the system. Therefore, experimental techniques to prevent or reverse qubit-ion chemistry will be a key tool for many-ion quantum information platforms. [18]. Given the difficulty of detecting scattered photons from dilute molecular-ion samples, rotational-state-selective PD has emerged as a critical tool for molecular ion spectroscopy [15,19] and precision measurements [16,20], while rotationally-insensitive dissociation schemes provide valuable tests of molecular * Electronic address: brian.sawyer@boulder.nist.gov ) after 9000 pulses of 157 nm photodissociation light at 1.6 mJ/pulse. We measure an increase in the Be + fraction from 81% to 97% of the constant total ion number in the crystal. Each image is 1.2 mm × 1.2 mm.

show abstract

mentioning

confidence: 99%

Reversing hydride-ion formation in quantum-information experiments withBe+

et al. 2015

View full text Add to dashboard Cite

show abstract

“…R ′ seg and R ′ via depend on the exact geometry, but usually vias have similar cross sections as the segments making their length-dependent resistances approximately equal. That means, in order to minimize (8) and to keep the cross section of the coil constant, (r o − r i ) and h should be similar in size.…”

Section: Pcb Coilsmentioning

confidence: 99%

“…Over the last two decades, the application of ion traps has expanded from mass spectrometry [1] and frequency standards [2,3] toward engineering of quantum systems which can be used for quantum computation [4][5][6] and quantum simulation [7,8]. It is commonly accepted that largescale trapped ion quantum information processors require micrometer-scale ion traps [5,9].…”

Section: Introductionmentioning

confidence: 99%

Cryogenic resonator design for trapped ion experiments in Paul traps

et al. 2016

Self Cite

View full text Add to dashboard Cite

few orders of magnitude lower than at room temperature. This enables trapping of longer ion strings due to fewer collisions with background gas. Furthermore, no bake-out procedure of the vacuum vessel is required, allowing for rapid trap cycle times.The operation of Paul traps requires high radio frequency (RF) voltages, which are usually generated with the aid of the voltage gain present in RF resonators. For this purpose, helical resonators are typically used in the frequency regime up to 50 MHz, whereas for experiments requiring higher drive frequencies coaxial resonators have been used as well [12][13][14]. In cryogenic experiments, the resonator needs to fulfill different criteria than in room temperature experiments where the resonator can be placed outside the vacuum vessel. In particular, the connections in a cryostat need to have low thermal conductivity to limit the thermal load. Following the Wiedemann-Franz law [15], these results in a low electrical conductivity between room temperature and the cryogenic parts of the experiment. Thus, the resonators have to be operated at the cold stage. Moreover, space constraints are stricter in cryogenic systems which makes helical resonators undesirable as they are generally bulky 1 . To minimize the volume of the resonator, an RLC series resonator can be used [17].In Sect. 2, we focus on the choice of the trap drive frequency, the required voltage gain, and voltage monitoring. Section 3 covers coil design for three types of coils, and in the following Sect. 4, we discuss impedance matching of the resonator and present an efficient way to match cryogenic resonators. Section 5 focuses on the design of RF shielding, and finally, we present the results in Sect. 6. 1 Helical resonators have been used in cryogenic systems [16].Abstract Trapping ions in Paul traps require high radio frequency voltages, which are generated using resonators. When operating traps in a cryogenic environment, an invacuum resonator showing low loss is crucial to limit the thermal load to the cryostat. In this study, we present a guide for the design and production of compact, shielded cryogenic resonators. We produced and characterized three different types of resonators and furthermore demonstrate efficient impedance matching of these resonators at cryogenic temperatures.

show abstract

“…Numerous advances have been achieved in this system, including realization of faithful quantum gates [1][2][3][4][5][6][7], preparation of many-body quantum states [8][9][10][11][12][13][14][15], and quantum teleportation [16,17]. There are also developments to scale up this system, based on either ion shuttling [18][19][20] or quantum networks [21][22][23][24][25][26]).…”

Section: Introductionmentioning

confidence: 99%

Sympathetic cooling in a large ion crystal

Lin

Duan

2015

Quantum Inf Process

View full text Add to dashboard Cite

We analyze the dynamics and steady state of a linear ion array when some of the ions are continuously laser cooled. We calculate the ions' local temperature measured by its position fluctuation under various trapping and cooling configurations, taking into account background heating due to the noisy environment. For a large system, we demonstrate that by arranging the cooling ions evenly in the array, one can suppress the overall heating considerably. We also investigate the effect of different cooling rates and find that the optimal cooling efficiency is achieved by an intermediate cooling rate. We discuss the relaxation time for the ions to approach the steady state, and show that with periodic arrangement of the cooling ions, the cooling efficiency does not scale down with the system size.

show abstract

Quasiparticle engineering and entanglement propagation in a quantum many-body system

Cited by 804 publications

References 39 publications

Reversing hydride-ion formation in quantum-information experiments withBe+

Reversing hydride-ion formation in quantum-information experiments withBe+

Cryogenic resonator design for trapped ion experiments in Paul traps

Sympathetic cooling in a large ion crystal

Contact Info

Product

Resources

About