Communication in Engineered Quantum Networks

Nikolopoulos, Georgios M.; Brougham, Thomas; Hoskovec, Antonín; Jex, Igor

doi:10.1007/978-3-642-39937-4_2

Cited by 29 publications

(44 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The transmission can be either obtained via optical means, or with one-dimensional (1D) qubit chains, to avoid the hybrid setups. Combining WYW computing with low-control methods to transfer states in 1D chains [8][9][10][11][12][13][14][15][16] would allow a minimal control approach to computation [7].…”

Section: Introductionmentioning

confidence: 99%

Quantum arithmetics via computation with minimized external control: The half-adder

2018

View full text Add to dashboard Cite

The while-you-wait computing paradigm combines elements of digital and analog quantum computation with the aim of minimizing the need of external control. In this architecture the computer is split into logic units, each continuously implementing a single recurring multigate operation via the unmodulated Hamiltonian evolution of a quantum many-body system. Here we use evolutionary algorithms to engineer such many-body dynamics, and develop logic units capable of continuously implementing a quantum half-adder in a time-independent four-qubit network, where qubits are coupled with either Ising or Heisenberg interactions. Our results provide a step for the development of larger modules for full quantum arithmetics.

show abstract

Section: Introductionmentioning

confidence: 99%

Quantum arithmetics via computation with minimized external control: The half-adder

2018

View full text Add to dashboard Cite

show abstract

“…The dynamics of such systems can be used for propagating information [1] across distant sites and has been studied intensively in the last decade [2,3]. Very recently, experimental realization of quantum state transfer through the natural dynamics of many-body systems have been achieved in NMR [4] and coupled optical fibers in linear optics [5].…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, experimental realization of quantum state transfer through the natural dynamics of many-body systems have been achieved in NMR [4] and coupled optical fibers in linear optics [5]. Most of the proposals so far (see [2,3] and the references therein), with very few exceptions like [6], are based on attaching an extra qubit, which encodes an "unknown" quantum state, to a chain of strongly interacting particles which is usually initialized to its ground state unless for certain engineered XX chains in which local endchain operations makes it to work for any initialization [7]. This mode of transmission does not seek to harness the intrinsic entanglement of many-body systems and the symmetries of the Hamiltonian seems to be more important [8].…”

Section: Introductionmentioning

confidence: 99%

Measurement-induced dynamics for spin-chain quantum communication and its application for optical lattices

2014

View full text Add to dashboard Cite

We present a protocol for quantum state transfer and remote state preparation across spin chains which operate in their anti-ferromagnetic mode. The proposed mechanism harnesses the inherent entanglement of the ground state of the strongly correlated many-body systems which naturally exists for free. The uniform Hamiltonian of the system does not need any engineering and, during the whole process, remains intact while a single qubit measurement followed by a single-qubit rotation are employed for both encoding and inducing dynamics in the system. This, in fact, has been inspired by recent progress in observing spin waves in optical lattice experiments, in which manipulation of the Hamiltonian is hard and instead local rotations and measurements have become viable. The attainable average fidelity stays above the classical threshold for chains up to length 50 and the system shows very good robustness against various sources of imperfection.

show abstract

“…DOI: 10.1103/PhysRevLett.118.133601 Introduction.-The ability to transfer quantum states between distant nodes of a quantum network via a quantum channel is a basic task in quantum information processing [1][2][3][4]. An outstanding challenge is to achieve quantum state transfer [5,6] (QST) with high fidelity despite the presence of noise and decoherence in the quantum channel. In a quantum optical setup, the quantum channels are realized as 1D waveguides, where quantum information is carried by "flying qubits" implemented either by photons in the optical [7][8][9] or microwave regime [10-13], or phonons [14,15].…”

mentioning

confidence: 99%

“…An outstanding challenge is to achieve quantum state transfer [5,6] (QST) with high fidelity despite the presence of noise and decoherence in the quantum channel. In a quantum optical setup, the quantum channels are realized as 1D waveguides, where quantum information is carried by "flying qubits" implemented either by photons in the optical [7][8][9] or microwave regime [10][11][12][13], or phonons [14,15].…”

mentioning

confidence: 99%

Microwave Quantum States Beat the Heat

Fink

2017

Physics

View full text Add to dashboard Cite

We describe a quantum state transfer protocol, where a quantum state of photons stored in a first cavity can be faithfully transferred to a second distant cavity via an infinite 1D waveguide, while being immune to arbitrary noise (e.g., thermal noise) injected into the waveguide. We extend the model and protocol to a cavity QED setup, where atomic ensembles, or single atoms representing quantum memory, are coupled to a cavity mode. We present a detailed study of sensitivity to imperfections, and apply a quantum error correction protocol to account for random losses (or additions) of photons in the waveguide. Our numerical analysis is enabled by matrix product state techniques to simulate the complete quantum circuit, which we generalize to include thermal input fields. Our discussion applies both to photonic and phononic quantum networks. DOI: 10.1103/PhysRevLett.118.133601 Introduction.-The ability to transfer quantum states between distant nodes of a quantum network via a quantum channel is a basic task in quantum information processing [1][2][3][4]. An outstanding challenge is to achieve quantum state transfer [5,6] (QST) with high fidelity despite the presence of noise and decoherence in the quantum channel. In a quantum optical setup, the quantum channels are realized as 1D waveguides, where quantum information is carried by "flying qubits" implemented either by photons in the optical [7][8][9] or microwave regime [10-13], or phonons [14,15]. Thus, imperfections in the quantum channel include photon or phonon loss, and, in particular for microwave photons and phonons, a (thermal) noise background [16]. In this Letter, we propose a QST protocol and a corresponding quantum optical setup which allow for state transfer with high fidelity, undeterred by these imperfections. A key feature is that our protocol and setup are a priori immune to quantum or classical noise injected into the 1D waveguide, while imperfections such as random generation and loss of photons or phonons during transmission can be naturally corrected with an appropriate quantum error correction (QEC) scheme [17].The generic setup for QST in a quantum optical network is illustrated in Fig. 1 as transmission of a qubit state from a first to a second distant two-level atom via an infinite 1D bosonic open waveguide. The scheme of Fig. 1(a) assumes a chiral coupling of the two-level atoms to the waveguide [18,19], as demonstrated in recent experiments with atoms [20] and quantum dots [21]. The atomic qubit is transferred in a decay process with a time-varying coupling to a rightmoving photonic (or phononic) wave packet propagating in the waveguide, i.e., ðc g jgi 1 þ c e jei 1 Þj0i p → jgi 1 ðc g j0i p þ c e j1i p Þ where ji 1 and ji p denote the atomic and channel states. The transfer of the qubit state is then completed by

show abstract

Communication in Engineered Quantum Networks

Cited by 29 publications

References 55 publications

Quantum arithmetics via computation with minimized external control: The half-adder

Quantum arithmetics via computation with minimized external control: The half-adder

Measurement-induced dynamics for spin-chain quantum communication and its application for optical lattices

Microwave Quantum States Beat the Heat

Contact Info

Product

Resources

About