Configurable Unitary Transformations and Linear Logic Gates Using Quantum Memories

Campbell, Geoff; Pinel, Olivier; Hosseini, Mahdi; Ralph, T. C.; Buchler, Benjamin; Lam, Ping Koy

doi:10.1103/physrevlett.113.063601

Cited by 35 publications

(35 citation statements)

References 29 publications

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“…[50][51][52]), and we will briefly compare that approach to the one here. In those memories, linear operations like beamsplitter gates on the stored spin states are achieved by either off-resonantly driving multiple internal states of the atomic ensemble to interfere spin waves stored on different frequency modes [50,51], or far-off resonantly driving one internal state with spatially and temporally shaped fields to interfere spin waves stored on different temporalspatial modes via an AC Stark shift [52]. In those memories, then, the linear operations are performed on optical states that are propagating through the memory.…”

Section: B Linear Processing Of Photonic Statesmentioning

confidence: 99%

“…In those memories, then, the linear operations are performed on optical states that are propagating through the memory. Thus, for example, in [50], operations can be performed only during the read-in or read-out stages of the memory. In the approach we describe here, linear operations are performed by resonantly transferring the spin qubit to a stationary optical qubit and using optical interactions on this non-propagating state.…”

Section: B Linear Processing Of Photonic Statesmentioning

confidence: 99%

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Quantum processing with ensembles of rare-earth ions in a stoichiometric crystal

et al. 2020

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We describe a method for creating small quantum processors in a crystal stoichiometric in an optically active rare earth ion. The crystal is doped with another rare earth, creating an ensemble of identical clusters of surrounding ions, whose optical and hyperfine frequencies are uniquely determined by their spatial position in the cluster. Ensembles of ions in each unique position around the dopant serve as qubits, with strong local interactions between ions in different qubits. These ensemble qubits can each be used as a quantum memory for light, and we show how the interactions between qubits can be used to perform linear operations on the stored photonic state. We also describe how these ensemble qubits can be used to enact, and study, error correction.

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Section: B Linear Processing Of Photonic Statesmentioning

confidence: 99%

Section: B Linear Processing Of Photonic Statesmentioning

confidence: 99%

Quantum processing with ensembles of rare-earth ions in a stoichiometric crystal

et al. 2020

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“…However, recently increasing attention of researchers is being paid to the use of memory cells not only as a delay mechanism for a quantum signal, but also for converting this signal and manipulating it directly within the memory cell [5,6]. Viewed in this light, quantum memory becomes an element of a quantum computer circuit.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that cluster states provide a resource for one-way computations [21,22]. The combination of cluster generation mechanism and the quantum memory protocol allows one to extend the time frames of manipulation in the one-way computational schemes and to overcome the problem of the Gaussian state decoherence [5,23,24]. At the same time one should take into account that the preparation of a cluster state assumes mixing of the light modes and distinguishing the quadrature components in a homodyne process.…”

Section: Introductionmentioning

confidence: 99%

Noiseless signal shaping and cluster-state generation with a quantum memory cell

et al. 2017

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In this article, we employ multimode radiation of a synchronously pumped optical parametric oscillator (SPOPO) to build a cluster state through a conversion on the base of quantum memory cell. We demonstrate that by choosing an appropriate driving field we can ensure the effective writing of the only one supermode from the entire set of the SPOPO squeezed supermodes. Further, by changing the driving field profile at the readout, we convert the time profile of the retrieved signal while maintaining its quantum state. We demonstrate the possibilities of using the presented scheme by the example of creating a four-mode linear cluster state of light.

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“…to have quantum memories that efficiently interface with the output of a preceding memory. More specifically, cascading of quantum memories are necessary for certain one-way quantum computing schemes via clusters states with memory-assisted feed-forward operations [15], the implementation of conditional CZ gates utilizing quantum optical memories connected in series [16] and generating multi-mode quantum states by cascading multiple four-wave mixing processes in atomic ensembles [17]. The foundation of these implementations will re- quire cascaded storage and retrieval schemes that exhibit both primary and secondary, high fidelity (with respect to the original input) quantum memory operations.…”

mentioning

confidence: 99%

Cascading quantum light-matter interfaces with minimal interconnection losses

Namazi¹,

Mittiga²,

Kupchak³

et al. 2015

Phys. Rev. A

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The ability to interface multiple optical quantum devices is a key milestone towards the development of future quantum networks that are capable of sharing and processing quantum information encoded in light. One of the requirements for any node of these quantum networks will be cascadability, i.e. the ability to drive the input of a node using the output of another node. Here, we report the cascading of quantum light-matter interfaces by storing few-photon level pulses of light in warm vapor followed by the subsequent storage of the retrieved field onto a second ensemble. We demonstrate that even after the sequential storage, the final signal-to-background ratio can remain greater than 1 for weak pulses containing 8 input photons on average.PACS numbers: 42.50. Ex, 42.50.Gy Any machine can be defined as a device composed of many constituents with their own specific functions but when interfaced together, are designed to carry out a much greater task. This same description would hold true for a quantum information processor, a complex machine capable of operating and processing quantum entities encoded with information. Given the recent success in the creation and control of individual quantum systems with a variety of physical architectures [1,2], the next logical step towards the realization of such a quantum machine is the interconnection between multiple quantum interfaces [3][4][5][6]. This type of functionality will be a prerequisite for networks in which quantum information and entanglement can be shared, either sequentially or simultaneously [7][8][9].The success of these networks will rely on having universal quantum nodes producing outputs suited for driving (as inputs) succeeding quantum nodes. This is the concept of quantum cascadability [10], and it is a necessary attribute for quantum computer architectures and quantum communication protocols [11][12][13]. By its definition, the concept of cascading has been widely implemented in setups based upon the interconnecting of quantum state sources and memories [18,19]. However, protocols or operations demanding another degree of cascading, that is setups that interconnect sources and multiple devices (i.e. memories) in a sequential manner have been primarily unexplored.Of the existing multi-device protocols, many will be reliant on operational quantum memories [14], and furthermore on the functionality to cascade these devices, i.e. to have quantum memories that efficiently interface with the output of a preceding memory. More specifically, cascading of quantum memories are necessary for certain one-way quantum computing schemes via clusters states with memory-assisted feed-forward operations [15], the implementation of conditional CZ gates utilizing quantum optical memories connected in series [16] and generating multi-mode quantum states by cascading multiple four-wave mixing processes in atomic ensembles [17]. The foundation of these implementations will re- quire cascaded storage and retrieval schemes that exhibit both primary and secondary, high ...

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Configurable Unitary Transformations and Linear Logic Gates Using Quantum Memories

Cited by 35 publications

References 29 publications

Quantum processing with ensembles of rare-earth ions in a stoichiometric crystal

Quantum processing with ensembles of rare-earth ions in a stoichiometric crystal

Noiseless signal shaping and cluster-state generation with a quantum memory cell

Cascading quantum light-matter interfaces with minimal interconnection losses

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