Photonic qubits, qutrits and ququads accurately prepared and delivered on demand

  title={Photonic qubits, qutrits and ququads accurately prepared and delivered on demand},
  author={Peter B. R. Nisbet-Jones and Jerome Alexander Martin Dilley and Annemarie Holleczek and Oliver Barter and Axel Kuhn},
  journal={New Journal of Physics},
Reliable encoding of information in quantum systems is crucial to all approaches to quantum information processing or communication. This applies in particular to photons used in linear optics quantum computing, which is scalable provided a deterministic single-photon emission and preparation is available. Here, we show that narrowband photons deterministically emitted from an atom–cavity system fulfil these requirements. Within their 500 ns coherence time, we demonstrate a subdivision into d… 

Qubits, qutrits, and ququads stored in single photons from an atom-cavity system

One of today’s challenge to realize computing based on quantum mechanics is to reliably and scalably encode information in quantum systems. Here, we present a photon source to on-demand deliver

Hyperentanglement of photons emitted by a quantum dot

Demonstration of polarization and time-bin hyper-entangled photons emitted from a single quantum dot and two-photon resonant and coherent excitation on a quantum dot system with marginal fine structure splitting yield fidelities to the maximally entangled state.

Cavity Induced Interfacing of Atoms and Light

This chapter introduces cavity-based light-matter quantum interfaces , with a single atom or ion in strong coupling to a high-finesse optical cavity . We discuss the deterministic generation of

Deterministic Shaping and Reshaping of Single-Photon Temporal Wave Functions.

This work identifies key parameters like the phases of the involved light fields and demonstrates absolute, flexible, and accurate control of the time-dependent complex-valued wave function of a single photon over several orders of magnitude.

Digital Discovery of 100 diverse Quantum Experiments with PyTheus

Photons are the physical system of choice for performing experimental tests of the foundations of quantum mechanics. Furthermore, photonic quantum technology is a main player in the second quantum

Time-bin quantum RAM

We have proposed a compact scheme of quantum random access memory (qRAM) based on the impedance matched multi-qubit photon echo quantum memory incorporated with the control four-level atom in two

Chapter 1 Cavity Induced Interfacing of Atoms and Light

This chapter introduces cavity-based light-matter quantum interfaces, with a single atom or ion in strong coupling to a high-finesse optical cavity. We discuss the deterministic generation of

Experimental and theoretical techniques for quantum-enhanced metrology and optical quantum information processing

This thesis describes a novel method for strain-based active control of quantum optical circuits and a new method for the characterisation of high efficiency detectors and focuses on linear-optical quantum information processing, exploring the use of time-frequency encodings for quantum computing.

Silica-on-silicon waveguide circuits and superconducting detectors for integrated quantum information processing

Building complex quantum systems has the potential to reveal phenomena that cannot be studied using classical simulation. Photonics has proven to be an effective test-bed for the investigation of

Cavity-based quantum networks with single atoms and optical photons

A vision has formed in recent years of the components necessary for a large-scale quantum network. Single trapped atoms can serve as the nodes of this network, with the links established by flying



Linear optical quantum computing with photonic qubits

Linear optics with photon counting is a prominent candidate for practical quantum computing. The protocol by Knill, Laflamme, and Milburn [2001, Nature (London) 409, 46] explicitly demonstrates that

Demonstration of non-deterministic quantum logic operations using linear optical elements

The experimental demonstration of two logic devices of this kind, a destructive controlled-NOT gate and a quantum parity check are reported, using polarization-encoded qubits incident on a polarizing beam splitter.

Time-bin entangled qubits for quantum communication created by femtosecond pulses

We create pairs of nondegenerate time-bin entangled photons at telecom wavelengths with ultrashort pump pulses. Entanglement is shown by performing Bell kind tests of the Franson type with

A scheme for efficient quantum computation with linear optics

It is shown that efficient quantum computation is possible using only beam splitters, phase shifters, single photon sources and photo-detectors and are robust against errors from photon loss and detector inefficiency.

Demonstration of nondeterministic quantum logic operations using linear optical elements.

The experimental demonstration of two logic devices, a destructive controlled-NOT (CNOT) gate and a quantum parity check, combined with a pair of entangled photons to implement a conventional CNOT that succeeds with a probability of 1/4.

An elementary quantum network of single atoms in optical cavities

This work demonstrates the faithful transfer of an atomic quantum state and the creation of entanglement between two identical nodes in separate laboratories and shows that atom–cavity systems form universal nodes capable of sending, receiving, storing and releasing photonic quantum information.

Optical Quantum Computing

Key challenges will be the realization of high-efficiency sources of indistinguishable single photons, low-loss, scalable optical circuits, high- efficiency single-photon detectors, and low- loss interfacing of these components.

Continuous‐variable quantum information processing

This paper is addressing the three main stages of a quantum information system; the preparation stage where quantum information is encoded into CVs of coherent states and single-photon states, the processing stage whereCV information is manipulated to carry out a specified protocol and a detection stage where CV information is measured using homodyne detection or photon counting.

Controlled-NOT gate operating with single photons

The initial proposal for scalable optical quantum computing required single photon sources, linear optical elements such as beamsplitters and phaseshifters, and photon detection. Here, we demonstrate

Deterministic single-photon source for distributed quantum networking.

A sequence of single photons is emitted on demand from a single three-level atom strongly coupled to a high-finesse optical cavity, which is essential for quantum communication and networking, and the photons should be appropriate for all-optical quantum information processing.