Multinode State Transfer and Nonlocal State Preparation via a Unidirectional Quantum Network

Fast quantum state transfer and entanglement preparation in strongly coupled bosonic systems

“…Quantum entanglement serves as a fundamental element for quantum computation and quantum communication [59][60][61]. The generation and distribution of entangled states have long been the main topic in the field of quantum information processing [12,14,[38][39][40][41]. In linear optical systems, entanglement can be prepared by certain bosonic transformation such as beam splitter.…”

“…For example, it plays a crucial role in the problem of Bose samplings [1][2][3][4][5], which is of particular interest in the study of near-term platform for photonic quantum computing [6]. The linear bosonic transformation can be effectively realized by optical beam splitters and wave plates in optical systems under the protocol raised by Knill, Laflamme and Milburn [7][8][9], or by controllable pulse manipulation in superconductor-waveguide systems [10][11][12][13][14][15]. Experimental progresses in this direction have facilitated the development of various quantum information tasks, including quantum state transfer (QST), entanglement preparation (EP) and entanglement distribution [12][13][14][15][16][17].…”

“…As an important step of quantum information processing, QST aims to transfer an arbitrary quantum state from the sender side to the receiver side with high fidelity and fast speed. Recently, to embrace the noisy intermediate-scale quantum era for quantum internet frameworks [15,[18][19][20][21], much effort has been made to implement QST tasks in various physical systems, including atom-cavity systems [10,[21][22][23], superconducting circuits [10][11][12][13][14]24], photonic systems [25][26][27], mechanical oscillators [28], opto-mechanical cavities [16,[29][30][31][32][33] and so on [17,[34][35][36][37]. Meanwhile, the generation of entangled states, as the first and fundamental step to realize quantum algorithms and manifest the so-called quantum supremacy, has been widely studied [12,14,[38][39][40][41].…”

“…Recently, to embrace the noisy intermediate-scale quantum era for quantum internet frameworks [15,[18][19][20][21], much effort has been made to implement QST tasks in various physical systems, including atom-cavity systems [10,[21][22][23], superconducting circuits [10][11][12][13][14]24], photonic systems [25][26][27], mechanical oscillators [28], opto-mechanical cavities [16,[29][30][31][32][33] and so on [17,[34][35][36][37]. Meanwhile, the generation of entangled states, as the first and fundamental step to realize quantum algorithms and manifest the so-called quantum supremacy, has been widely studied [12,14,[38][39][40][41]. By manipulating the bosonic transformation matrix, entanglement resource can be generated and distributed among different ports of user.…”

Universal Time-Dependent Control Scheme for Realizing Arbitrary Linear Bosonic Transformations

“…( 9) reduces to the dark-state condition employed for identifying control pulses for single-mode quantum state transfer schemes [33,[50][51][52][53][54][55] (see also Ref. [56] for a preliminary extension to multimode setups). In the Supplemental Material [46], we show that satisfying this generalized set of dark-state conditions for all l ¼ 1; …; N is not only necessary, but also sufficient to obtain G BA ðt f ; t 0 Þ ≃ U and G BB ðt f ; t 0 Þ ≃ 0 for sufficiently long t f .…”